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【新文速递】2023年12月19日固体力学SCI期刊最新文章

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今日更新:International Journal of Solids and Structures 1 篇,Journal of the Mechanics and Physics of Solids 1 篇,Mechanics of Materials 1 篇,International Journal of Plasticity 2 篇,Thin-Walled Structures 6 篇

International Journal of Solids and Structures

Microstructure generation algorithm and micromechanics of curved fiber composites with random waviness

Ayan Kumar, Anirvan DasGupta, Atul Jain

doi:10.1016/j.ijsolstr.2023.112625

随机波纹弯曲纤维复合材料微结构生成算法及细观力学

During multiscale modeling and analysis of composite materials, accurately capturing the distinctive microstructural features of the material is essential. This is achieved by generating a representative volume element (RVE). Fiber reinforcements in composites can exhibit various shapes, including straight, slightly wavy, or complex shapes, depending on the inherent properties or the manufacturing process. Fibers are characterized based on their tortuosity, spread, and orientation distribution. It is crucial to account for these geometrical attributes during the microstructure generation and subsequent micromechanics modelling as they significantly influence the effective properties of the composite. The present work describes a novel algorithm capable of modeling a broad range of 3D periodic microstructures with fibers having random waviness. The effects of various parameters in the algorithm are studied to understand their influence on fiber shapes. This is followed by finite element analysis of the generated RVEs using the embedded element technique to quantify the microstructure- mechanical properties relationships. Finally, guidelines on the usage of the proposed model to generate fibers with desired microstructure is elucidated. A comprehensive framework for modeling and analyzing microstructures with complex fiber geometry is outlined.

在复合材料的多尺度建模和分析中,准确捕捉材料独特的微观结构特征是必不可少的。这是通过生成一个代表性体积元素(RVE)来实现的。复合材料中的纤维增强材料可以呈现各种形状,包括直线型、微波浪形或复杂形状,这取决于其固有特性或制造工艺。纤维的特征是基于它们的弯曲度、扩散和取向分布。在微观结构生成和随后的微观力学建模过程中考虑这些几何属性是至关重要的,因为它们显著影响复合材料的有效性能。本工作描述了一种新的算法,能够模拟具有随机波纹的纤维的广泛的三维周期性微结构。研究了算法中各参数对纤维形状的影响。然后使用嵌入单元技术对生成的rve进行有限元分析,以量化微观结构与力学性能的关系。最后,阐明了使用所提出的模型生成具有所需微观结构的纤维的指导方针。概述了一种用于复杂纤维几何微结构建模和分析的综合框架。


Journal of the Mechanics and Physics of Solids

Mechanism of crack evolution and strength failure in chemo-mechanical induced fracture

Jiajing Yin, Quanzi Yuan

doi:10.1016/j.jmps.2023.105525

化学力学致断裂裂纹演化及强度破坏机制研究

Chemo-mechanical coupled fracture is ubiquitous among various application fields. Understanding the mechanism of crack propagation is critical to the prediction and control of fracture behavior. In this paper, mechanical damage and chemical erosion have been investigated by a combination of experiments and theoretical analysis. We developed a theoretical model to analyze the interface evolution and the mechanical state of the crack tip in chemically active environments based on the transition-state theory. This model enables us to predict mechanical failure and chemical corrosion of materials exposed to external acid attack. Theoretical predictions of the corrosion rate and fracture strength have been validated by fracture experiments performed in different concentrations of corrosive solutions. In particular, we discovered a non-monotonic and non-linear relationship between the degree of corrosion and fracture strength, which demonstrates that corrosion-induced crack tip blunting and mass loss of materials together affect the cracking critical state. We further conducted the thermodynamic analysis of a quasi-static cracked body to investigate the effect of corrosion on energy stored in the crack tip. Our theory-experiment-combined study reveals the mechanism of coupling chemical and mechanical damage and provides significant insight into corrosion-induced fracture behavior in aggressive environments.

化学-力学耦合断裂在各个应用领域中无处不在。了解裂纹扩展机制对断裂行为的预测和控制至关重要。本文采用实验和理论分析相结合的方法,对机械损伤和化学侵蚀进行了研究。基于过渡态理论,建立了分析化学活性环境中界面演化和裂纹尖端力学状态的理论模型。该模型使我们能够预测暴露于外部酸侵蚀的材料的机械失效和化学腐蚀。在不同浓度的腐蚀溶液中进行的断裂实验验证了腐蚀速率和断裂强度的理论预测。特别是,我们发现了腐蚀程度与断裂强度之间的非单调非线性关系,这表明腐蚀引起的裂纹尖端钝化和材料的质量损失共同影响裂纹临界状态。我们进一步进行了准静态裂纹体的热力学分析,以研究腐蚀对裂纹尖端储存能量的影响。我们的理论-实验相结合的研究揭示了化学和机械耦合损伤的机制,并为在腐蚀性环境中腐蚀引起的断裂行为提供了重要的见解。


Mechanics of Materials

Self-similar hierarchical honeycombs in two different fractal layouts: A comparative study of the in-plane crushing behaviors

Yu Chen

doi:10.1016/j.mechmat.2023.104900

两种不同分形布局下的自相似分层蜂窝:面内破碎行为的比较研究

This paper provides a new avenue for the development of cellular structures. By mimicking the chemical structural formula of the TpPB-Fe coordination polymer, a new self-similar hierarchical honeycomb was proposed. With respect to the existing self-similar hierarchical honeycomb in the literature which was constructed by replacing every three-edge vertex of the regular hexagonal honeycomb with a smaller hexagon, the new one is created by setting the fractal position at the midpoint of the cell walls of the regular hexagonal honeycomb. What I am really curious about is the difference in mechanical properties between the two self-similar hierarchical honeycombs. Finite element (FE) model was first built and validated by comparing against the existing theoretical data. Subsequently, the in-plane crushing behaviors of the honeycombs under different impact velocities were fully investigated by FE simulations. The deformation modes, plateau stress as well as the energy absorption capability of the honeycombs were studied. Different macroscopic and microscopic deformation patterns between the two hierarchical honeycombs were observed. The plateau stress of the new hierarchical honeycomb is higher than that of both the existing counterpart and the basic regular hexagonal one. Under low- and medium-velocity impact loading, the new honeycomb with low fractal ratio (α) has superior energy absorption capability with respect to the existing counterpart and the basic regular hexagonal one. However, the new honeycomb will lose its advantage in energy absorption when the fractal ratio or the impact velocity is large.

这为细胞结构的发展提供了一条新的途径。通过模拟TpPB-Fe配位聚合物的化学结构式,提出了一种新的自相似分层蜂窝结构。文献中已有的自相似分层蜂窝是用较小的六边形代替正六边形蜂窝的每一个三边顶点来构造的,本文将分形位置设置在正六边形蜂窝细胞壁的中点处来构造新的自相似分层蜂窝。我真正好奇的是这两种自相似的等级蜂巢在机械性能上的差异。首先建立了有限元模型,并与已有的理论数据进行了对比验证。在此基础上,通过有限元模拟全面研究了不同冲击速度下蜂窝的面内破碎行为。研究了蜂窝结构的变形模式、高原应力和吸能能力。观察到两种分层蜂窝的宏观和微观变形模式不同。新型分层蜂窝的高原应力高于现有的分层蜂窝和基本的正六边形蜂窝。在低、中速冲击载荷作用下,具有低分形比(α)的新型蜂窝比现有蜂窝和基本正六边形蜂窝具有更强的吸能能力。然而,当分形比或冲击速度较大时,新型蜂窝在吸能方面的优势将会丧失。


International Journal of Plasticity

Microstructural size effect on the notch fatigue behavior of a Ni-based superalloy using crystal plasticity modelling approach

Jin-Chao He, Shun-Peng Zhu, Jie-Wei Gao, Rui Liu, Wei Li, Qiang Liu, Yun He, Qingyuan Wang

doi:10.1016/j.ijplas.2023.103857

显微组织尺寸对镍基高温合金缺口疲劳行为的影响

Fatigue performances of critical structures are strongly affected by the microstructural (e.g. grain, defect, inclusion, etc.) size effect, and it is thus important to quantify their detrimental effect. In this work, a numerical procedure is constructed to quantify the influence of microstructure on the mechanical and fatigue behaviors of Ni-based superalloy GH4169. Specifically, by combining sub-modelling approach with crystal plasticity constitutive model, a dual-scale modelling approach is developed for studying grain-level mechanical behavior of Ni-based superalloy GH4169 notched components. In addition, the dislocation-based Tanaka-Mura-Wu model is applied for fatigue crack initiation life prediction. The Paris law is then utilized for fatigue crack propagation analysis based on the simulated short crack. To study the microstructural size effect on fatigue crack initiation and propagation behaviors, sub-models containing various grain orientation, grain size, defect size/shape are built and analysed. Finally, a series of fatigue tests on notched specimens of Ni-based superalloy GH4169 were carried out for method validation. Results indicate that the established dual-scale modelling approach and fatigue life prediction framework yields good agreement with experimental results.

关键组织的疲劳性能受微观组织(如晶粒、缺陷、夹杂物等)尺寸效应的强烈影响,因此对其有害影响进行量化具有重要意义。本文建立了一种量化微观组织对ni基高温合金GH4169力学和疲劳行为影响的数值计算方法。具体而言,将子建模方法与晶体塑性本构模型相结合,建立了研究ni基高温合金GH4169缺口构件晶粒级力学行为的双尺度建模方法。此外,将基于位错的Tanaka-Mura-Wu模型应用于疲劳裂纹萌生寿命预测。在模拟短裂纹的基础上,利用Paris定律进行疲劳裂纹扩展分析。为了研究微观组织尺寸对疲劳裂纹萌生和扩展行为的影响,建立并分析了包含不同晶粒取向、晶粒尺寸、缺陷尺寸/形状的子模型。最后,对ni基高温合金GH4169的缺口试样进行了一系列疲劳试验,验证了方法的有效性。结果表明,所建立的双尺度建模方法和疲劳寿命预测框架与试验结果吻合较好。


Short-range order-dependent dislocation mobilities in CrCoNi medium entropy alloy: atomistic simulations and modeling

Yu Tian, Fei Chen

doi:10.1016/j.ijplas.2023.103859

CrCoNi中熵合金中短距离有序化位错迁移率:原子模拟与建模

Understanding dislocation behavior is considered an effective way to design high performance alloys, as it is closely associated with mechanical properties. The existence of short-range order (SRO) and its ability to improve the strength and ductility of high- and medium-entropy alloys (H/MEAs) have been experimentally documented. However, few researches focused on the mechanism of dislocation motion in H/MEAs with SRO. In this study, the correlation between the degree of SRO and edge dislocation mobility in CrCoNi MEA was studied by atomistic simulations. The results show that the dislocation mobility is strongly dependent on the degree of SRO. As the degree of SRO increased, the dislocation mobility decreased linearly due to the increased energy barrier. The dislocation mobility model coupling with the SRO effects was proposed, in which the parameters were determined by molecular dynamic (MD) simulations. The energy barriers varied with the SRO degree were obtained from the model and have been compared with the theoretical predictions. A good agreement between prediction of the model and theoretical values was achieved. Using the drag coefficients obtained from this fitting, a binary linear regression model of the drag coefficient as a function of SRO degree and temperature was constructed. The proposed dislocation mobility model might be important for the construction of mechanistic predictive theory of CrCoNi MEA systems with SRO, and can also provide more accurate and reliable inputs for higher length scale simulations.

了解位错行为被认为是设计高性能合金的有效途径,因为它与力学性能密切相关。实验证明了短程有序(SRO)的存在及其提高高、中熵合金(H/MEAs)强度和延展性的能力。然而,对具有SRO的H/MEAs中位错运动机制的研究较少。本研究通过原子模拟研究了CrCoNi MEA中SRO程度与边缘位错迁移率之间的关系。结果表明,位错的迁移率与SRO的程度密切相关。随着SRO程度的增加,位错迁移率由于能垒的增加而线性降低。提出了考虑SRO效应的位错迁移率模型,并通过分子动力学模拟确定了模型参数。从模型中得到了随SRO程度变化的能垒,并与理论预测结果进行了比较。模型预测值与理论值吻合较好。利用拟合得到的阻力系数,构建了阻力系数随SRO程度和温度的二元线性回归模型。本文提出的位错迁移率模型对于构建含SRO的CrCoNi - MEA系统的力学预测理论具有重要意义,也可以为更高长度尺度的模拟提供更准确和可靠的输入。


Thin-Walled Structures

Symmetric and asymmetric buckling of rotating eccentric annular plate

Yukang Yang, Jinming Fan, Youheng Dong, Yinghui Li

doi:10.1016/j.tws.2023.111489

偏心旋转环形板的对称和非对称屈曲

The thermo-induced buckling, including the symmetric and asymmetric buckling, of rotating eccentric annular plate is investigated. And the splitting phenomenon in buckling caused by structural eccentricity is at the core of the present paper. To overcome the computational difficulty resulted from the irregular physical field of the eccentric annular plate, the transformed differential quadrature method is adopted to solve the governing equations. The governing equations and boundary conditions are discretized directly in the physical domain by utilizing the conformal mapping. The combined effects of eccentricity, boundary conditions, geometric dimensions, and rotational motion on the buckling of annular plate are discussed through parameter studies. The eccentricity leads to the splitting of asymmetric buckling of eccentric annular plate. With the increase of eccentricity, this phenomenon becomes more obvious. Meanwhile, the variation tendency of critical buckling temperature rise is closely related to the number of pitch diameter in buckling mode. The sequence of symmetric and asymmetric buckling appears is affected by the boundary conditions. To a certain extent, the rotational motion inhibits the splitting phenomenon in buckling arised from the eccentricity.

研究了偏心旋转环形板的热致屈曲,包括对称屈曲和非对称屈曲。而结构偏心引起的屈曲劈裂现象是本文研究的核心。为克服偏心环形板物理场不规则造成的计算困难,采用变换微分正交法求解控制方程。控制方程和边界条件通过保角映射直接在物理域中离散化。通过参数研究,讨论了偏心、边界条件、几何尺寸和旋转运动对环形板屈曲的综合影响。偏心导致偏心环形板的非对称屈曲开裂。随着偏心距的增大,这种现象更加明显。同时,临界屈曲温升的变化趋势与屈曲模式下的节径数密切相关。对称屈曲和非对称屈曲的发生顺序受边界条件的影响。旋转运动在一定程度上抑制了偏心引起的屈曲中的劈裂现象。


Experimental study on the hysteretic behavior of aluminum alloy gusset joint with rectangular hollow sections

Mingze Wu, Shenggang Fan, Ziwei Zhao, Meijing Liu, Lizhi Hu, Tao Yu

doi:10.1016/j.tws.2023.111500

矩形空心截面铝合金扣板节点滞回特性试验研究

Aluminum alloys were extensively applied in single-layer latticed shells owing to their exceptional mechanical properties, outstanding corrosion resistance, and aesthetic appeal. In traditional aluminum alloy grid shell structures, H-section components were widely utilized. However, the H-section components exhibited poor self-stability compared to rectangular hollow sections, whose limitation constrains the utilization of aluminum alloy single-layer latticed shells. To overcome this problem, a named ARH (Aluminum Rectangular Hollow) joint was developed using BOM bolts by some scholars, and the out-of-plane bending behavior was studied. This paper conducted out-of-plane hysteretic tests on four ARH joints with different bolt numbers and gusset thicknesses. Subsequently, a finite element model was developed to simulate the hysteretic behavior of the ARH joint. The simulation results were compared with the test results to verify the accuracy of the model. Then, a series of parameter analyses based on the developed finite element model were conducted. For the ARH joint, Analysis results showed that the decrease in bolt numbers and gusset thicknesses resulted in the weakening of the stiffness and bearing capacity, and the increase of bolt-hole diameters resulted in elevated slip deformation. Moreover, in gusset joints, joints with rectangular hollow sections have greater out-of-plane bending resistance compared to joints made from H-sections with the same section height and flange thickness.

铝合金因其优异的力学性能、优异的耐腐蚀性和美观性,被广泛应用于单层网壳。在传统的铝合金网壳结构中,广泛采用h型钢构件。然而,与矩形空心截面构件相比,h截面构件的自稳定性较差,这限制了铝合金单层网壳的应用。为了解决这一问题,有学者采用BOM螺栓设计了一种ARH(铝矩形空心)连接,并对其面外弯曲行为进行了研究。本文对4种不同螺栓编号和扣板厚度的ARH节点进行了面外滞回试验。随后,建立了模拟ARH节点滞回特性的有限元模型。将仿真结果与试验结果进行对比,验证了模型的准确性。然后,基于所建立的有限元模型进行了一系列参数分析。对于ARH节点,分析结果表明,螺栓数量和扣板厚度的减少导致节点刚度和承载能力减弱,螺栓孔直径的增加导致滑移变形升高。此外,在扣板节点中,矩形空心截面的节点比相同截面高度和法兰厚度的h型截面的节点具有更大的面外抗弯能力。


A tunable slit-plate absorber with multiparameter cooperative control

Xiao Zhang, Fei Wu, Shanlin Yan, Dewen Zhang, Yi Qin, Jun Luo, Huayan Pu, Man Hu, Mingyuan Gao

doi:10.1016/j.tws.2023.111502

一种多参数协同控制的可调缝板吸收器

Tunable acoustic metamaterials have a more flexible operating spectrum while still controlling acoustic waves via subwavelength thickness, but their operating range and acoustic absorption performance are limited by a single-parameter tuning mechanism. In this study, we first propose a slit-plate absorber with reconstructed porosity, which has a dynamic continuous tuning capability and is easier to achieve low-frequency resonance. Then, in order to improve its acoustic absorption performance, we study the tuning laws of numerous structural factors as well as their cooperative interaction. Local parameter changes to achieve impedance compensation and isotropic control to enhance frequency shift are presented to greatly improve the tunable range and sound absorption level. A tunable absorber with multi-parameter cooperative control is constructed using this method. The results reveal that continuous tuning of 210-920Hz is possible at a total thickness of 25mm, and the sound absorption coefficient in the tuning range is more than 0.8, and the thickness of the structure at 210 Hz is 1/65 of the absorption wavelength. Our work demonstrates a new method for improving the performance of adjustable acoustic metamaterials and promotes the use of acoustic metamaterials in low frequency changing noise environments.

可调谐声学超材料在通过亚波长厚度控制声波的同时具有更灵活的工作光谱,但其工作范围和吸声性能受到单参数调谐机制的限制。在本研究中,我们首先提出了一种具有重构孔隙度的缝板吸收体,它具有动态连续调谐能力,更容易实现低频共振。然后,为了提高其吸声性能,我们研究了多种结构因素的调谐规律及其协同相互作用。通过改变局部参数来实现阻抗补偿和各向同性控制来增强频移,大大提高了可调谐范围和吸声水平。利用该方法构造了一个多参数协同控制的可调谐吸收器。结果表明,在总厚度为25mm时,可以实现210 ~ 920hz的连续调谐,调谐范围内的吸声系数大于0.8,210 Hz处的结构厚度为吸收波长的1/65。我们的工作展示了一种改善可调声学超材料性能的新方法,并促进了声学超材料在低频变化噪声环境中的应用。


Development of a Eurocode-based design method for local and distortional buckling for cold-formed C-sections encased in ultra-lightweight concrete under compression

Ahmed Alabedi, Péter Hegyi

doi:10.1016/j.tws.2023.111504

基于欧洲规范的超轻混凝土冷弯c型钢受压局部屈曲和扭曲屈曲设计方法的发展

An innovative direction in the field of light-gauge building systems has been presented in recent years when the cold formed steel (CFS) C-sections are encased in an ultra-lightweight material. The advantages of the two materials are integrated, resulting in a unique complex structure in which the encasing material provides heat insulation and fire protection. In addition, this material supports the CFS parts, which leads to an increase in their resistance to stability failures. This paper presents an innovative design procedure for encased CFS elements based on the specifications of Eurocode by applying the effective width method. The new design is based on analytical and numerical basis, incorporating the continuous bracing action of the encasing material by an elastic half-space-model, similar to sandwich beam theory. Close-form equations are derived to calculate the encased CFS's local and distortional critical stress. Furthermore, the applicability of the new design is demonstrated using a large set of experimental data of newly tested members and previously published ones. Results show that the trend of calculated and measured results matches well, making the proposed design method applicable in the investigated domain.

近年来,在轻量化建筑系统领域提出了一个创新方向,即冷弯型钢(CFS)剖面图被超轻量化材料包裹。两种材料的优点融合在一起,形成了独特的复杂结构,其中包裹材料提供隔热和防火功能。此外,这种材料支持CFS部件,从而增加了它们对稳定性失效的抵抗力。本文在欧洲规范规范的基础上,采用有效宽度法,提出了一种新颖的包壳CFS构件设计方法。新的设计基于解析和数值基础,采用弹性半空间模型,类似于夹层梁理论,将包围材料的连续支撑作用纳入其中。推导了封闭CFS的局部临界应力和变形临界应力的近似方程。此外,利用大量新测试构件和先前发表的实验数据,证明了新设计的适用性。计算结果与实测结果吻合良好,表明所提出的设计方法适用于所研究的领域。


Shear resistance of perforated QN1803 high-strength stainless steel plate girders through experimental testing and numerical analysis

Boshan Chen, Yuanqing Wang, Jun Ye, James B.P. Lim, Letian Hai

doi:10.1016/j.tws.2023.111505

通过实验测试和数值分析对QN1803高强不锈钢穿孔板梁的抗剪性能进行了研究

QN1803, a high-strength stainless steel, has been developed by steel industry recently. Its tensile yield strength can be approximately 40% (or more) higher than that of the commonly-used EN1.4301, while its cost is 20% lower due to its reduced nickel content. One obvious application for QN1803 is in plate girders, where web perforations are often required to accommodate building services. However, no research work has been reported in the literature that investigates the reduced shear buckling capacity of QN1803 plate girders as a result of web perforations. This issue is addressed herein. An experimental program comprising six plate girder tests is conducted in this study. Three different hole ratios were considered: 0.2, 0.4 and 0.6. The depths of web were selected as 700 mm and 500 mm, while the thickness of web was fixed as 4.0mm. The initial geometric imperfections were determined from three-dimensional (3D) scanning prior to the plate girder tests. Finite element (FE) models incorporating the material non-linearity and initial geometric imperfections were then developed and validated against the experimental results. A parametric analysis including 62 FE models was performed to examine the influences of the critical parameters on the shear buckling capacity of such perforated members. The results suggest that for those members with a hole diameter - web height ratio of 0.6, the shear buckling capacity was reduced by 56% on average due to the web perforation. The design rules for determining the shear buckling capacity of stainless steel plate girders as specified in Eurocodes (EN 1993-1-4+A1) (2015) and American Specification (ANSI/AISC 370-21) (2021) were evaluated. Upon comparison, it was demonstrated that both EN 1993-1-4+A1 (2015) and ANSI/AISC 370-21 (2021) cannot provide accurate and safe predictions for determining the shear buckling capacity of such members.

QN1803是近年来钢铁工业开发的一种高强度不锈钢。其抗拉屈服强度可比常用的EN1.4301高约40%(或更多),而由于镍含量降低,其成本降低了20%。QN1803的一个明显的应用是板梁,其中腹板穿孔通常需要容纳建筑服务。然而,没有研究工作的报道,在文献中调查降低剪切屈曲能力的QN1803板梁由于腹板穿孔。此问题在此解决。本文设计了一个由6个板梁试验组成的试验方案。考虑了三种不同的井眼比:0.2、0.4和0.6。腹板深度分别为700 mm和500 mm,腹板厚度固定为4.0mm。在板梁试验之前,通过三维扫描确定了初始几何缺陷。然后建立了包含材料非线性和初始几何缺陷的有限元模型,并根据实验结果进行了验证。采用62个有限元模型进行了参数分析,考察了关键参数对多孔构件抗剪屈曲能力的影响。结果表明,当孔直径与腹板高度之比为0.6时,腹板穿孔使构件的剪切屈曲能力平均降低56%;评估了欧洲规范(EN 1993-1-4+A1)(2015)和美国规范(ANSI/AISC 370-21)(2021)中规定的不锈钢板梁剪切屈曲能力的设计规则。通过比较,证明了EN 1993-1-4+A1(2015)和ANSI/AISC 370-21(2021)都不能为确定此类构件的剪切屈曲能力提供准确和安全的预测。


Fatigue life prediction method of Q235 steel single lap thin-walled bolted connections under shear loading

Long Yang, Guangwu Yang, Han Zhao, Bing Yang, Lanxin Jiang, Shoune Xiao

doi:10.1016/j.tws.2023.111507

剪切作用下Q235钢单搭接薄壁螺栓连接疲劳寿命预测方法

In this study, a large number of shear fatigue tests were conducted on Q235 steel single lap thin-walled bolted connections to investigate the influence of different geometric and load parameters on the dispersion of fitting data for load amplitude-life (Fa–N) curves. Due to the large dispersion of fitting data, the Fa–N curves were unable to meet engineering requirements. In order to standardize these Fa–N curves, an equivalent structural stress model for single lap thin-walled bolted connections was established based on a mechanical model with a strict physical definition. The shell equivalent model of the Q235 steel single lap thin-walled bolted connection was developed using the Rupp structural stress calculation method, and the equivalent structural stress was determined by considering the node loads coupled by the beam element. Subsequently, a normalized fatigue characteristic curve (Ss–N curve) was created to standardize the Fa–N curves. However, differences in external load, pre-tightening force, bolt diameter, and plate thickness resulted in a relatively low correlation across the entire Ss–N curve. To address this, four quasi-Newton optimization algorithms (C1–C4) were employed to optimize the equivalent structural stress model. This approach yielded the best optimization model for equivalent structural stress and an Ss–N curve with a higher correlation. These findings offer valuable insights for optimizing single lap thin-walled bolted connection parameters and predicting fatigue life.

本研究对 Q235 钢单搭接薄壁螺栓连接进行了大量剪切疲劳试验,以研究不同几何参数和载荷参数对载荷振幅-寿命(Fa-N)曲线拟合数据离散度的影响。由于拟合数据离散性较大,Fa-N 曲线无法满足工程要求。为了使这些 Fa-N 曲线标准化,根据具有严格物理定义的力学模型,建立了单搭接薄壁螺栓连接的等效结构应力模型。采用 Rupp 结构应力计算方法建立了 Q235 钢单搭接薄壁螺栓连接的壳体等效模型,并通过考虑梁元素耦合的节点载荷确定了等效结构应力。随后,创建了归一化疲劳特性曲线(Ss-N 曲线),使 Fa-N 曲线标准化。然而,外部载荷、预紧力、螺栓直径和板厚的差异导致整个 Ss-N 曲线的相关性相对较低。为此,我们采用了四种准牛顿优化算法(C1-C4)来优化等效结构应力模型。这种方法产生了最佳的等效结构应力优化模型和相关性更高的 Ss-N 曲线。这些发现为优化单搭接薄壁螺栓连接参数和预测疲劳寿命提供了有价值的见解。



来源:复合材料力学仿真Composites FEM
ACTMechanicalSystemDeform疲劳断裂复合材料非线性化学建筑ADS声学裂纹理论材料单元技术
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【新文速递】2023年12月21日复合材料SCI期刊最新文章

今日更新:Composite Structures 6 篇,Composites Part A: Applied Science and Manufacturing 2 篇,Composites Part B: Engineering 1 篇,Composites Science and Technology 1 篇Composite StructuresEnvelope enrichment method for homogenization of non-periodic structuresFlorian Vazeille, Louis Laberge Lebeldoi:10.1016/j.compstruct.2023.117819非周期性结构均质化的包络富集法The homogenization of composite materials is critical for accurately predicting their mechanical performance, particularly when complex reinforcement arrangements are involved. Microstructural characteristics exert a substantial influence on the composite’s properties during practical applications. A widely adopted approach for analyzing composites is the numerical simulation of a Representative Volume Element (RVE). Although this method is well-established for periodic RVEs, it encounters difficulties when applied to non-periodic meshes, which complicates the imposition of classical boundary conditions on nodes exhibiting varying properties. To address this challenge, we propose a novel methodology that involves modeling an envelope surrounding the RVE, to which periodic boundary conditions are applied. By defining the envelope as a homogeneous material, stress transmission to the RVE is facilitated. The stiffness tensor of the envelope is updated iteratively through a homogenization process, ultimately converging to the effective properties of the RVE. The method is validated on a non-periodic arrangement of spherical inclusions embedded within a matrix. 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Nevertheless, experimental stress-strain results for FRP-confined RC columns (FCRC) have demonstrated some behavioural features that cannot be simulated accurately through this kind of model, developed exclusively for FRP-confined concrete columns (FCC). In this paper, a new design-oriented stress-strain model is proposed for the prediction of load-carrying capacity versus axial strain relationship of FCRC. For this purpose, a new parabolic stress-strain expression is developed for calculating the first branch of FCRC’s response up to the transition zone, followed by a linear function. New formulations are proposed to determine the first branch’s stress-strain gradient, transition zone-related information and the second branch’s slope, calibrated using a large test database of FCRC. The proposed design-oriented model is capable of simulating accurately the combined influence of the dual FRP and steel confinement on load-carrying capacity versus axial strain relationship of FCRC. Lastly, the capability of this model is validated by comparison to existing experimental data of FCRC and those obtained from some of existing models in the literature.为了评估纤维增强聚合物(FRP)约束素混凝土构件在承受轴向压缩荷载时由约束引起的力学性能增强,已经开展了许多研究,并开发了大量预测模型。然而,FRP 密实 RC 柱(FCRC)的应力-应变实验结果表明,这种专门为 FRP 密实混凝土柱(FCC)开发的模型无法准确模拟某些行为特征。本文提出了一种以设计为导向的新应力应变模型,用于预测 FCRC 的承载能力与轴向应变关系。为此,开发了一种新的抛物线应力-应变表达式,用于计算 FCRC 直至过渡区的第一个响应分支,随后是一个线性函数。提出了新的公式来确定第一分支的应力-应变梯度、过渡区相关信息和第二分支的斜率,并使用 FCRC 的大型测试数据库进行校准。所提出的以设计为导向的模型能够准确模拟玻璃钢和钢双重约束对 FCRC 承载能力与轴向应变关系的综合影响。最后,通过与现有 FCRC 试验数据以及文献中一些现有模型所获得的数据进行比较,验证了该模型的能力。An enhanced constitutive model to predict plastic deformation and multiple failure mechanisms in fibre-reinforced polymer composite materialsI.R. Cózar, F. Otero, P. Maimí, E.V. González, A. Turon, P.P. Camanhodoi:10.1016/j.compstruct.2023.117696预测纤维增强聚合物复合材料塑性变形和多重失效机制的增强构效模型Spurious damage modes in continuum damage mechanics models for fiber-reinforced polymer composite materials based on the effective stress tensor can be generated when large strains occur. A methodology to prevent this spurious phenomenon is developed in the present work. The longitudinal damage activation functions are based on the effective stress tensor, however, nominal stresses are used on the transverse damage activation functions. The proposed method can be straightforwardly implemented on previously-developed constitutive models which use effective stress tensor, an explicit implementation of the proposed constitutive model is presented. The enhancement of the predicted failure mechanisms obtained from the present constitutive model, with respect to the models which use effective stress tensor, is demonstrated. The proposed constitutive model presents a good agreement of the predicted failure pattern obtained from open-hole compressive experimental tests, as well as on the predicted failure strength.在基于有效应力张量的纤维增强聚合物复合材料连续损伤力学模型中,当出现大应变时可能会产生假损伤模式。本研究开发了一种方法来防止这种虚假现象。纵向损伤激活函数基于有效应力张量,而横向损伤激活函数则使用名义应力。所提出的方法可以在以前开发的使用有效应力张量的构成模型上直接实施,本文介绍了所提出的构成模型的明确实施方法。与使用有效应力张量的模型相比,本构成模型所预测的破坏机制得到了增强。建议的构成模型与开孔压缩实验测试得出的预测破坏模式以及预测破坏强度具有良好的一致性。Mass lumping schemes fitted to MLS-based numerical manifold method in vibration of plates with cutouts using CPT and FSDTShuaixing Zhao, Shan Lin, Miao Dong, Hongwei Guo, Hong Zhengdoi:10.1016/j.compstruct.2023.117815 在使用 CPT 和 FSDT 的带切口的板振动中,基于 MLS 的数值流形方法适用的质量叠加方案It is critical to accurately extract the natural frequencies in the transverse vibration of plates using the classical plate theory (CPT) and the first-order shear deformation plate theory (FSDT). The moving least squares (MLS) based numerical manifold method (MLS-based NMM) in conjunction with a suitable diagonally lumped mass matrix is a reasonable choice because it can naturally treat plates with cutouts and easily formulate an H2 regular approximation based on MLS interpolation, as well as mitigate shear locking issues for vibration analysis of thin plates based on FSDT. Moreover, the mass lumping techniques involving the row-sum method, the diagonal scaling method, and the mathematically rigorous manifold-based method are extended and derived in the unified framework of MLS-based NMM for transverse vibration analysis of plates. Furthermore, the positive-definiteness of the lumped mass matrix (LMM) generated by the manifold-based mass method is explained in MLS settings, and the row-sum method is proven to be a special case of the manifold-based method. A comprehensive comparative study of different LMMs is performed in accordance with the consistent mass matrix (CMM) on extensive numerical benchmarks. Numerical results demonstrate the convergence properties of LMMs compared with CMM in MLS-based NMM for plate vibration based on CPT and FSDT. It can be observed that LMMs yield comparable performance compared with CMM. The row-sum method obtains accurate results in most cases but can not guarantee the positivity. In contrast, the manifold method can guarantee the positive-definiteness of LMM and is more accurate than the diagonal scaling method in most cases.利用经典板理论(CPT)和一阶剪切变形板理论(FSDT)精确提取板横向振动的固有频率至关重要。基于移动最小二乘法(MLS)的数值流形方法(MLS-based NMM)与合适的对角块状质量矩阵相结合,是一种合理的选择,因为它可以自然地处理带有切口的板,并能轻松地根据 MLS 的移动最小二乘法和对角块状质量矩阵制定出 H2 正则近似,还能缓解基于 FSDT 的薄板振动分析中的剪切锁定问题。此外,在基于 MLS 的 NMM 统一框架下,扩展并推导了涉及行和法、对角线缩放法和基于流形的数学严谨方法的质量叠加技术,用于板的横向振动分析。此外,还解释了基于流形的质量矩阵(LMM)在 MLS 环境下的正定义性,并证明行和法是基于流形方法的特例。根据一致质量矩阵(CMM),在大量数值基准上对不同的 LMM 进行了全面的比较研究。数值结果表明,在基于 CPT 和 FSDT 的板振动 MLS NMM 中,与 CMM 相比,LMM 具有收敛特性。可以看出,与 CMM 相比,LMM 的性能相当。行和法在大多数情况下都能得到精确的结果,但不能保证正向性。相比之下,流形法可以保证 LMM 的正定义性,并且在大多数情况下比对角缩放法更精确。Analysis and Experiments of Bi-stable Laminate Configuration Control Based on MFC Piezoelectric ActuationYulin Jiang, Lu Yang, Chaofeng Li, Xueyang Miaodoi:10.1016/j.compstruct.2023.117820基于 MFC 压电致动的双稳态层压板配置控制分析与实验This paper studies the configuration change control and the snap-through phenomenon of bi-stable laminate with the MFC piezoelectric plate. The kinetic and potential energy expressions of the piezoelectric bi-stable laminate were obtained based on the von-Karman hypothesis. The constitutive equations of the system were given using a six-parameter displacement model, and the potential function of the system was derived using Hamilton’s principle. The configuration changes of the piezoelectric bi-stable laminate under different geometrical conditions were analyzed. The influence of voltage on the bi-stable laminate configuration was studied by applying different driving voltages. The snap-through energy variation of the piezoelectric bi-stable laminate under different geometrical conditions was investigated. In the experimental part, the changes in bi-stable laminate configuration with different geometrical conditions and after attaching the piezoelectric plate were compared. Different driving voltages were applied to measure the difference in piezoelectric bi-stable laminate configuration, and the critical snap-through voltages were recorded. The measured changes in bi-stable laminate configuration and snap-through voltage at different voltages prove the correctness of the theoretical presentation.本文研究了带有 MFC 压电板的双稳态层压板的构型变化控制和快穿现象。根据 von-Karman 假设得到了压电双稳态层压板的动能和势能表达式。利用六参数位移模型给出了系统的构成方程,并利用汉密尔顿原理推导出了系统的势函数。分析了压电双稳态层压板在不同几何条件下的构型变化。通过施加不同的驱动电压,研究了电压对双稳态层压板构型的影响。研究了压电双稳态层压板在不同几何条件下的快穿能量变化。在实验部分,比较了不同几何条件下和安装压电板后双稳态层压板配置的变化。通过施加不同的驱动电压来测量压电双稳态层压板配置的差异,并记录临界击穿电压。在不同电压下测得的双稳态压电片配置和速通电压的变化证明了理论表述的正确性。Comprehensive 3-D homogenization approach for predicting mechanical properties and creep behavior of polymer nanocomposites reinforced with graphene nanoplateletsHadi Mehdipour, Abbas Rohani Bastami, Mohammad Hossein Soorgeedoi:10.1016/j.compstruct.2023.117823预测石墨烯纳米片增强聚合物纳米复合材料力学性能和蠕变行为的综合三维均质化方法The aim of this study is to provide a comprehensive 3-D homogenization approach based on the high-fidelity generalized method of cells method to predict the mechanical properties and creep behavior of polymer nanocomposite reinforced with graphene nanoplatelets. Several fundamental experimental aspects including the volume fraction, size, and random orientation of graphene nanoplatelets, the interphase region, and the aggregation state of nanofillers of graphene are taken into account. The present study introduces two novel perspectives. At first, the aggregation of graphene nanoplatelets is formulated as dependent on volume fraction. Then the size of graphene is formulated as an important factor affecting the interphase region and the mechanical properties of polymer nanocomposite. Micromechanical tests conducted using the proposed method illustrate the good agreement with experimental data. The results of the parametric study on different experimental aspects revealed important findings. (i) For a specific value of graphene nanoplatelet volume fraction, the mechanical properties of polymer nanocomposite are at the best state. By increasing the graphene content beyond the specified graphene content value, the effective properties of graphene are decreased. (ii) The size of graphene nanoplatelets and the characteristics of the graphene/polymer interphase region have a direct effect on the properties of the nanocomposite.本研究旨在提供一种基于高保真广义单元法的综合三维均质化方法,用于预测石墨烯纳米片增强聚合物纳米复合材料的力学性能和蠕变行为。本研究考虑了几个基本的实验方面,包括石墨烯纳米片的体积分数、尺寸和随机取向、相间区域以及石墨烯纳米填料的聚集状态。本研究提出了两个新观点。首先,石墨烯纳米小板的聚集取决于体积分数。然后,石墨烯的尺寸被认为是影响相间区域和聚合物纳米复合材料机械性能的重要因素。使用所提出的方法进行的微机械测试表明,该方法与实验数据非常吻合。不同实验方面的参数研究结果揭示了重要的发现。(i) 在特定的石墨烯纳米颗粒体积分数值下,聚合物纳米复合材料的力学性能处于最佳状态。当石墨烯含量超过规定值时,石墨烯的有效性能就会下降。(ii) 石墨烯纳米小板的尺寸和石墨烯/聚合物相间区的特性直接影响纳米复合材料的性能。Composites Part A: Applied Science and ManufacturingRationally Designed Conductive Wood with Mechanoresponsive Electrical ResistanceGabriella G. Mastantuoni, Van Chinh Tran, Jonas Garemark, Christopher H. Dreimol, Isak Engquist, Lars A. Berglund, Qi Zhoudoi:10.1016/j.compositesa.2023.107970 合理设计具有机动力电阻的导电木材Porous cellular foams, combining lightweight, high strength, and compressibility, hold great promise in a wide range of advanced applications. Here, the native structure of pine wood was modified by in-situ lignin sulfonation and unidirectional freezing, resulting in an alveolate structure inside the wood cell wall with arrays of sub-100 nm channels. The obtained wood foam exhibited highly enhanced permeability while retaining the native cellular arrangement and high lignin and hemicellulose content. Such engineered cellular foam contributed to superior mechanical performance with compressive strength of 9 MPa and Young’s modulus of 344 MPa in the longitudinal direction. The high porosity allowed homogeneous infiltration of conductive polymer PEDOT:PSS inside the wood cell wall. The resulting composite exhibited high conductivity, sponge-like compressibility and the ability to modulate electrical resistance in a reversible manner in the radial direction. This rationally designed conductive wood demonstrated potential in durable and ultrasensitive pressure-responsive devices and strain sensors.多孔细胞泡沫集轻质、高强度和可压缩性于一身,在广泛的先进应用中大有可为。在这里,通过原位木质素磺化和单向冷冻改变了松木的原生结构,从而在木材细胞壁内形成了具有亚 100 纳米通道阵列的泡孔结构。获得的木质泡沫在保留了原生细胞排列以及高木质素和半纤维素含量的同时,还大大提高了透气性。这种工程蜂窝泡沫具有卓越的机械性能,纵向抗压强度达 9 兆帕,杨氏模量达 344 兆帕。高孔隙率使导电聚合物 PEDOT:PSS 能够均匀地渗入木细胞壁内。由此产生的复合材料具有高导电性、海绵般的可压缩性,并能在径向以可逆的方式调节电阻。这种设计合理的导电木材在耐用、超灵敏的压力响应设备和应变传感器方面表现出了潜力。Effects of Cellular Crossing Paths on Mechanical Properties of 3D Printed Continuous Fiber Reinforced Biocomposite Honeycomb StructuresPing Cheng, Kui Wang, Yong Peng, Said Ahzidoi:10.1016/j.compositesa.2023.107972细胞交叉路径对三维打印连续纤维增强生物复合蜂窝结构机械性能的影响3D printing continuous fiber reinforced composite (CFRC) has the advantages of manufacturing complex shapes and short production cycles. Due to the anisotropic mechanical properties of continuous fibers, the printing path of the fibers determines the properties of the printed CFRCs. In this paper, a series of novel cellular crossing paths were proposed to print continuous ramie fiber reinforced biocomposite honeycomb structures (CFHSs). The compression, bending, and tensile tests were performed to analyze the effects of cellular crossing paths on the mechanical properties of CFHSs. An assessment method was presented for analyzing the comprehensive mechanical properties of CFHSs printed by different printing paths. The results showed that the CFHSs printed by no-crossing path (Path-1), single-crossing path (Path-3), and double-crossing path (Path-4) exhibited better compression, bending, and tensile properties, respectively. In addition, the samples printed by Path-3 were the most outstanding in the assessments of comprehensive mechanical properties, the comprehensive performance assessment score was 1.5 times that of the single-crossing path (Path-2, minimum score). Thus, an appropriate cellular crossing path could be selected according to the structural load-bearing state, thereby providing higher mechanical properties.三维打印连续纤维增强复合材料(CFRC)具有制造复杂形状和生产周期短的优点。由于连续纤维具有各向异性的力学性能,纤维的打印路径决定了打印出的 CFRC 的性能。本文提出了一系列新颖的蜂窝交叉路径,用于打印连续苎麻纤维增强生物复合蜂窝结构(CFHS)。通过压缩、弯曲和拉伸试验,分析了蜂窝交叉路径对 CFHS 力学性能的影响。还提出了一种评估方法,用于分析不同印刷路径印刷的 CFHS 的综合力学性能。结果表明,无交叉路径(路径-1)、单交叉路径(路径-3)和双交叉路径(路径-4)印刷的 CFHS 分别具有更好的压缩、弯曲和拉伸性能。此外,路径-3 印刷的样品在综合机械性能评估中表现最为突出,其综合性能评估得分是单交叉路径(路径-2,得分最低)的 1.5 倍。因此,可以根据结构承载状态选择合适的蜂窝交叉路径,从而提供更高的机械性能。Composites Part B: EngineeringHierarchical rigid porous composites towards impact resistance and fire safetyYongqian Shi, Ruizhe Huang, Miao Liu, Junqiang Han, Peihui Xu, Yuezhan Feng, Libi Fu, Fuqiang Yang, Bin Yudoi:10.1016/j.compositesb.2023.111139 实现抗冲击和防火安全的分层刚性多孔复合材料Impact injuries and fire risks generally coexist simultaneously in extreme environments. In this context, it is of great necessity to design impact resistant materials with both flame retardant performance and thermal stability. Here, a multi-functional flame retardant coating was prepared from the combination of silica sol (Si-sol), phytic acid (PA) and expandable graphite (EG) by graft modification with γ-propyl-trimethoxysilane (KH550). Subsequently, hierarchical composites were fabricated using one-pot foaming and brush coating method, where the carbon fiber cloth and coating served as the surface layer, while rigid polyurethane foams (RPUF) acted as the interlayer. The hierarchical structure endowed the RPUF composites with high compression resistance and impact resistance properties. Furthermore, the flame retardant coating could effectively reduce the values of peak heat release rate and peak smoke production rate of RPUF composites by 77.5% and 81.8%, respectively. Therefore, these RPUF composites can effectively prevent impact damage and achieve excellent flame retardancy, making them promising candidates as safety protective materials.在极端环境中,撞击伤害和火灾风险通常同时存在。在这种情况下,设计兼具阻燃性能和热稳定性的抗冲击材料就显得尤为必要。在此,我们采用γ-丙基三甲氧基硅烷(KH550)接枝改性的方法,制备了一种由硅溶胶(Si-sol)、植酸(PA)和可膨胀石墨(EG)组合而成的多功能阻燃涂层。随后,采用一锅发泡和刷涂法制备了分层复合材料,其中碳纤维布和涂层作为表层,硬质聚氨酯泡沫(RPUF)作为中间层。分层结构使 RPUF 复合材料具有较高的抗压和抗冲击性能。此外,阻燃涂层还能有效降低 RPUF 复合材料的峰值放热率和峰值产烟率,降幅分别为 77.5% 和 81.8%。因此,这些 RPUF 复合材料能有效防止冲击损伤,并具有优异的阻燃性能,有望成为安全防护材料。Composites Science and TechnologyAn innovative tunable bimodal porous PCL/gelatin dressing fabricated by electrospinning and 3D printing for efficient wound healing and scalable productionErfan Rezvani Ghomi, Vijila Chellappan, Rasoul Esmaeely Neisiany, Nileshkumar Dubey, Kottaiswamy Amuthavalli, Navin Kumar Verma, Rajamani Lakshminarayanan, Seeram Ramakrishnadoi:10.1016/j.compscitech.2023.110402 通过电纺丝和三维打印技术制造的创新型可调双模多孔 PCL/明胶敷料,可实现高效伤口愈合和规模化生产This study presents the development of tunable scaffolds with bimodal porosity comprising poly(ε-caprolactone) (PCL) micro-meshes and PCL/gelatin/ε-polylysine (ε-PL) fibrous layers. Pure PCL scaffolds were prepared using the fused deposition modeling technique featuring grid geometry and interconnected micro-pores, followed by electrospinning to produce PCL/gelatin/ε-PL nanofibrous layers. Field emission scanning electron microscopy was employed to investigate the morphological features of the scaffolds, while the physicomechanical properties were studied using tensile and contact angle tests. Antibacterial performance and skin cell toxicity of the scaffolds were determined by bacterial disc diffusion and viability assays, respectively. Morphological analysis showed the presence of micro-to nano-sized pores in the developed scaffolds. The mechanical test results revealed that the prepared scaffolds exhibited Young's modulus values similar to the human skin with higher strain. The nanocomposite scaffolds were cytocompatible and effectively eradicated common bacteria associated with cutaneous wounds. In light of the aforementioned results along with facile fabrication, the tunable PCL/gelatin/ε-PL porous scaffolds hold great promise for applications in skin wound repair.本研究介绍了由聚(ε-己内酯)(PCL)微网格和 PCL/明胶/ε-聚赖氨酸(ε-PL)纤维层组成的具有双峰孔隙率的可调支架的开发过程。纯 PCL 支架是利用熔融沉积建模技术制备的,具有网格几何形状和相互连接的微孔,然后通过电纺丝产生 PCL/明胶/ε-PL 纳米纤维层。利用场发射扫描电子显微镜研究了支架的形态特征,并通过拉伸和接触角测试研究了其物理机械性能。细菌盘扩散和存活率试验分别测定了支架的抗菌性能和皮肤细胞毒性。形态学分析表明,所制备的支架中存在微到纳米级的孔隙。力学测试结果表明,所制备支架的杨氏模量值与人体皮肤相似,但应变较大。纳米复合材料支架具有细胞相容性,能有效消灭与皮肤伤口有关的常见细菌。鉴于上述结果和简便的制备方法,可调 PCL/明胶/ε-PL 多孔支架在皮肤伤口修复中的应用前景广阔。来源:复合材料力学仿真Composites FEM

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