【新文速递】2024年9月14日固体力学SCI期刊最新文章

 

今日更新：Journal of the Mechanics and Physics of Solids 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 7 篇

Journal of the Mechanics and Physics of Solids

Generalized grain boundary constitutive description implemented in a strain-gradient large-strain FFT-based formulation: Application to nano-metallic laminates

Miroslav Zecevic, Ricardo A. Lebensohn, Laurent Capolungo

doi:10.1016/j.jmps.2024.105859

基于应变梯度大应变fft公式的广义晶界本构描述:在纳米金属层压板中的应用

This paper presents a general treatment of grain boundary constitutive behavior in the context of strain-gradient (SG) plasticity, and its numerical implementation in a large-strain (LS) elasto-viscoplastic (EVP) fast Fourier transform (FFT)-based micromechanical model. Two novel grain boundary constitutive equations are proposed, allowing for more accurate description of the Burgers vector flow at the grain boundary. The capabilities of the generalized SG-LS-EVPFFT formulation are illustrated for the case of kink-band formation during layer-parallel compression of nano-metallic laminates (NMLs), requiring consideration of the interaction between dislocations and interfaces.

本文提出了应变梯度(SG)塑性背景下晶界本构行为的一般处理方法，并在基于大应变(LS)弹粘塑性(EVP)快速傅立叶变换(FFT)的细观力学模型中进行了数值实现。提出了两种新的晶界本构方程，可以更准确地描述晶界处的Burgers矢量流。在纳米金属层压板(NMLs)的层平行压缩过程中，需要考虑位错和界面之间的相互作用，说明了广义SG-LS-EVPFFT公式的能力。

International Journal of Plasticity

Effect of grain size on the deformation mechanism and fracture behavior of a non-equiatomic CoCrNi alloy with low stacking fault energy

S.Y. Peng, Y.Z. Tian, Z.Y. Ni, S. Lu, S. Li

doi:10.1016/j.ijplas.2024.104129

晶粒尺寸对低层错能非等原子CoCrNi合金变形机制和断裂行为的影响

Manipulation of stacking fault energy (SFE) plays a significant role in microstructure control and in turn mechanical properties of advanced alloys. In this work, we present the influence of grain size on the mechanical properties and fracture behavior of a non-equiatomic CoCrNi alloy with low SFE. Specimens with controlled grain sizes ranging from 0.61 to 6.4 µm were fabricated through rolling and annealing. A novel SFs-dominated plastic deformation mechanism was discovered. Tensile strength decreases monotonically with increasing grain size, while ductility achieves a peak value at the medium grain size, contradicting with the typical behavior observed in most single-phase face-centered cubic (FCC) metallic materials deformed primarily by dislocation slips and/or twinning. The fracture behavior changes from void coalescence to quasi cleavage with grain coarsening, and the fracture mechanisms were analyzed. Additionally, the evolution of SFs and phase transformation is explored at various deformation strains.

层错能的控制对高级合金的微观组织控制和力学性能有重要影响。在这项工作中，我们研究了晶粒尺寸对低SFE非等原子CoCrNi合金力学性能和断裂行为的影响。通过轧制和退火制备了晶粒尺寸为0.61 ~ 6.4 μ m的试样。发现了一种以sfs为主导的新型塑性变形机制。拉伸强度随晶粒尺寸的增加而单调降低，而塑性在中晶粒尺寸处达到峰值，这与大多数主要由位错滑移和/或孪晶变形的单相面心立方(FCC)金属材料的典型行为相矛盾。随着晶粒粗化，断口行为由空洞聚结转变为准解理，并对断裂机理进行了分析。此外，还探讨了不同变形应变下SFs的演化和相变。

Thin-Walled Structures

Dynamic modeling and active aeroelastic flutter control of functionally graded irregular plates with piezoelectric layers based on the discrete-coupling method

Hui Zhang, Wei Sun, Yu Zhang, Haitao Luo, Kunpeng Xu

doi:10.1016/j.tws.2024.112421

基于离散耦合法的压电层功能梯度不规则板动力学建模及气动弹性颤振主动控制

The research on active flutter control of functionally graded material structures is of great significance to improve the safety and stability of aerospace systems. Therefore, the purpose of this study is to analyze the active flutter control of functionally graded irregular plates (FGIP) by attaching piezoelectric layers to their surfaces. Firstly, a discrete-coupled modeling method for irregular panel structures is proposed. The main modeling idea is to discretize the whole structure and calculate the energy expression of the discretized individuals. Then, the adjacent individuals are coupled by artificial springs. Finally, the dynamic model of irregular panel structure is established based on the Hamilton principle. The validity of this modeling method is verified by comparing the results with the natural characteristics of the finite element model. The first-order supersonic piston theory is used to calculate aerodynamic pressure, and the flutter characteristics of FGIP under supersonic airflow are analyzed. In addition, the influence of the power law index of functionally graded materials on structural flutter characteristics is discussed. To suppress the flutter of FGIP, the displacement feedback control method is used to provide active stiffness for the structure and then change the flutter characteristics of the structure. The results show that active control can effectively improve the anti-flutter ability of the structure.

功能梯度材料结构颤振主动控制研究对提高航空航天系统的安全性和稳定性具有重要意义。因此，本研究的目的是分析在功能梯度不规则板(FGIP)表面附加压电层的颤振主动控制。首先，提出了不规则板结构的离散耦合建模方法。其主要建模思想是将整个结构离散化，并计算离散个体的能量表达式。然后，相邻的个体通过人工弹簧进行耦合。最后，基于Hamilton原理建立了不规则板结构的动力学模型。将仿真结果与有限元模型的自然特性进行比较，验证了该建模方法的有效性。采用一阶超声速活塞理论计算气动压力，分析了超声速气流作用下FGIP的颤振特性。此外，还讨论了功能梯度材料幂律指数对结构颤振特性的影响。为了抑制颤振，采用位移反馈控制方法为结构提供主动刚度，从而改变结构的颤振特性。结果表明，主动控制能有效提高结构的抗颤振能力。

Local Buckling Behaviour of Web Perforated Cold-Formed Steel Lipped Channel Columns

Amoke Shabhari, Vijaya Vengadesh Kumar Jeyapragasam, D Chandrasekar

doi:10.1016/j.tws.2024.112448

腹板冷弯型钢唇形槽钢柱的局部屈曲行为

To connect beams and bracings with storage rack uprights, closely spaced perforations are provided along the web, flanges, and rear flanges of uprights. These perforations can significantly lower the ultimate capacity of such compression members with the possible influence of its natural buckling modes. This capacity reduction can depend on various parameters such as (a) geometrical shape, proportioning of cross-section, and stiffeners; (b) perforation shape, size, spacing, and location; (b) slenderness of member, cross-section, and elements of cross-section; and (d) material properties. A thorough understanding of the influence of the above-mentioned factors is necessary for the accurate strength prediction of perforated Cold-Formed Steel (CFS) compression members. Even though the current design standards are updated for the accurate strength prediction of unperforated CFS compression members, they do not collectively account for the influence of all the aforementioned factors on the load-carrying capacity of the perforated CFS members, particularly for the local buckling capacity. Though the Direct Strength Method (DSM) of design is the most accepted method for accurate strength prediction of CFS members even for complex cross-sectional shapes, recent research on the strength evaluation of perforated CFS members using DSM has emphasized the need for refinement in DSM. The Modified Direct Strength Method (MDSM), which accounts for the simultaneous buckling of flanges and web, includes the cross-section aspect ratio and cross-section slenderness to predict more accurately the local buckling design strength. However, it was developed only for unperforated specimens. Hence, a systematic experimental and numerical investigation was done to understand the influence of the perforation in the local buckling behavior of the lipped channel section. In total, 14 specimens, including 2 unperforated and 12 web perforated CFS lipped channel stub columns were physically tested with fixed support conditions. The Finite Element Analysis using ABAQUS software was used to conduct an extensive parametric numerical study. The results were used to compare the strength curves of DSM and MDSM and the modification in the design curves has been proposed by considering the erosion in strength due to the presence of perforation.

为了将横梁和支撑与储物架立柱连接起来，沿腹板、法兰和立柱后法兰提供了紧密间隔的穿孔。这些孔洞可以显著降低这种受压构件的极限承载力，并可能影响其自然屈曲模式。这种能力减少可以取决于各种参数，如(a)几何形状，截面比例和加强筋;(b)射孔形状、尺寸、间距和位置;(b)构件、截面和截面单元的长细度;(d)材料性能。深入了解上述因素的影响，是准确预测冷弯型钢压孔构件强度的必要条件。尽管目前的设计标准是为了准确预测无孔CFS压缩构件的强度而更新的，但它们并没有综合考虑上述所有因素对穿孔CFS构件承载能力的影响，特别是对局部屈曲能力的影响。虽然直接强度法(DSM)是最被广泛接受的设计方法，即使是在复杂的截面形状下也能准确预测CFS构件的强度，但最近关于使用DSM进行穿孔CFS构件强度评估的研究强调了DSM需要改进的必要性。改进的直接强度法(MDSM)考虑了法兰和腹板的同时屈曲，包括截面长径比和截面长细比，可以更准确地预测局部屈曲设计强度。然而，它只适用于未穿孔的标本。为此，本文进行了系统的实验和数值研究，以了解孔眼对唇形通道截面局部屈曲行为的影响。在固定支护条件下，共对14根CFS唇形槽短柱进行了物理试验，其中2根为未穿孔，12根为腹板穿孔。采用有限元分析软件ABAQUS进行了广泛的参数数值研究。将结果与DSM和MDSM的强度曲线进行了比较，并考虑了射孔对强度的侵蚀，对设计曲线进行了修正。

Vibration and response behaviors of composite sandwich cylindrical shells with corrugated-honeycomb blended cores in inhomogeneous thermal environments

Bocheng Dong, Tianci Li, Lihao Zhang, Kaiping Yu, Rui Zhao

doi:10.1016/j.tws.2024.112454

非均匀热环境下波纹-蜂窝复合夹层圆柱壳的振动与响应特性

In the present study, an original sandwich cylindrical shell structure composed of a corrugated-honeycomb blended core and functional gradient composite skins with even and uneven porosity defects is tailored for lightweight engineering components, where both the cylindrical honeycomb-corrugated cross-reinforced core and composite forms deliver novel design, optimization, and refinement schemes for associated sandwich shell structures. Accordingly, an analytical model for predicting and assessing the vibration and response behaviors of such structures is proposed to repair the absence of matched theoretical tools in the current market. Also, an inhomogeneous temperature field and various external loads as the endured environmental factors are introduced to enrich the prediction capacity and reference scope of the developed model. Herein, the refined equivalent mechanical parameters of the corrugated-honeycomb blended core are analytically formulated using a macroscopic homogeneity approach based on the strain energy invariant criterion, and the mechanical properties of functional gradient composite skins obeying the power, sigmoid, and exponential distributions are further determined, with even and uneven porosity defects being considered. Besides, the inhomogeneous temperature spreads at various locations in the core and skin parts are derived from the solutions of Fourier heat conduction equations. Employing the first-order shear deformation theory, the Green heat strain hypothesis, and the spring simulation technique, the analytical expressions of elastic strain, thermal strain, boundary potential, and kinetic energies are obtained, with the work generated by external loads included. Subsequently, the free and forced vibration solutions of such structures in the form of Jacobi polynomial displacement assumptions are reaped using the Rayleigh-Ritz and Newmark-beta computation routines. Convergence analyses and comparison studies are conducted to ensure valid model parameters and output results. Lastly, the effect of the temperature spread on the inherent characteristics and vibration responses is disclosed, and optimal schemes of core configurations and skin material allocations are provided for the utmost vibration suppression capability.

在本研究中，一种由波纹-蜂窝混合芯和具有均匀和不均匀孔隙缺陷的功能梯度复合材料表皮组成的原始夹层圆柱壳结构是为轻量化工程部件量身定制的，其中圆柱形蜂窝-波纹交叉增强芯和复合材料形式都为相关的夹层壳结构提供了新颖的设计，优化和改进方案。因此，本文提出了一种预测和评估此类结构振动和响应行为的分析模型，以弥补目前市场上缺乏相应理论工具的不足。同时，引入非均匀温度场和多种外载荷作为所承受的环境因素，丰富了所建模型的预测能力和参考范围。在此基础上，基于应变能不变准则，采用宏观均匀性方法解析推导了波纹蜂窝复合芯的细化等效力学参数，并进一步确定了服从幂次分布、s型分布和指数分布的功能梯度复合材料蒙皮的力学性能，同时考虑了均匀和不均匀孔隙缺陷。此外，利用傅里叶热传导方程的解推导出了芯部和蒙皮部不同位置的非均匀温度分布。采用一阶剪切变形理论、格林热应变假设和弹簧模拟技术，得到了弹性应变、热应变、边界势和动能的解析表达式，其中包括外载荷做功。随后，使用Rayleigh-Ritz和Newmark-beta计算程序，以Jacobi多项式位移假设的形式获得了这种结构的自由和强迫振动解。为了保证模型参数和输出结果的有效性，进行了收敛分析和对比研究。最后，揭示了温度扩散对固有特性和振动响应的影响，并提供了芯结构和蒙皮材料配置的最佳方案，以获得最大的振动抑制能力。

Close-in explosion performances and damage evaluation of bamboo fiber reinforced laminates

Yunze Yang, Zhenyu Qiu, Hualin Fan

doi:10.1016/j.tws.2024.112461

竹纤维增强层压板近距离爆炸性能及损伤评价

Three types of laminated bamboo plates (LBPs), namely flat-pressed one-way plates (PRs), flat-pressed orthogonal plates (PCs), and side-pressed one-way plates (PTs), were designed and manufactured to investigate their mechanical responses under quasi-static and blast loadings. The experimental results show that the LBPs have excellent blast resistance. In-field explosion experiments clearly reveal the damage patterns of the LBPs with scaled distance changing from 2.052 m/kg1/3 to 0.054 m/kg1/3. Plates PR and PT have five damage patterns, which are slightly scorched, matrix cracking, fiber breakage, spalling and outbreak-crash, respectively. Plates PC eliminate the matrix cracking damage pattern through balancing the anisotropy by orthogonal structure. After explosion, the LBPs still maintain good elasticity, structural integrity and high residual bearing capacity. The residual bearing capacity of plates PR-1, PT-1 and PC-1 repetitively suffered seven explosions is decreased to 58.8%, 42.6% and 68.7% of the average bearing capacity of the reference plates, respectively. It is concluded that orthogonal and side-pressed structures are conducive to enhance the load carrying capacity of the LBP.

设计并制造了三种类型的竹层合板(lbp)，即平压单向板(PRs)、平压正交板(PCs)和侧压单向板(PTs)，研究了它们在准静态和爆炸载荷下的力学响应。实验结果表明，lbp具有优异的抗爆炸性能。现场爆炸实验清楚地揭示了lbp在2.052 m/kg1/3 ~ 0.054 m/kg1/3范围内的损伤规律。PR板和PT板有5种损伤模式，分别为微焦、基体开裂、纤维断裂、剥落和爆发破碎。平板PC通过正交结构平衡各向异性消除基体裂纹损伤模式。爆炸后lbp仍保持良好的弹性、结构完整性和较高的残余承载力。PR-1、PT-1和PC-1重复经历7次爆炸后的残余承载力分别下降到参考板平均承载力的58.8%、42.6%和68.7%。结果表明，正交和侧压结构有利于提高桥面结构的承载能力。

A nested non-intrusive stochastic isogeometric method for nonlinear thermal vibration of FGM plates under random loading

Junli Guo, Yahui Zhang

doi:10.1016/j.tws.2024.112462

随机载荷作用下FGM板非线性热振动的嵌套非侵入式随机等几何方法

This paper introduces an adaptive nested non-invasive dynamic SIGA method based on RBFNN for the nonlinear thermal vibration analysis of FGM plates under random loading. This method is robust and accurate in high-dimensional input spaces regardless of the sample sequence, addresses the low convergence rate of QMCS, and solves the stochastic dynamic response probability density function under random loading. Firstly, the multidimensional input space for random loading is constructed based on several mutually independent random variables via the stationary Gaussian stochastic process simulation technique. The nonlinear FGM plate model subjected to random loading in the thermal environment is modeled using HSDT with von Kármán strain-displacement relation within the IGA framework. Subsequently, a nested non-invasive dynamic response surface analysis method, SIGA-RBFNN, is proposed based on the RBFNN technique. Analysis of the FGM plate response under random loading demonstrates that SIGA-RBFNN, compared to tensor-product-based SIGA methods, is less affected by sample sequence types. It effectively addresses high-dimensional stochasticity and offers significant advantages in robustness, accuracy, and efficiency. Finally, SIGA-RBFNN compensates for the low convergence speed of QMCS and successfully solves the FGM plate displacement response statistics and probability density function under random loading.

针对随机载荷作用下FGM板的非线性热振动分析，提出了一种基于RBFNN的自适应嵌套无创动态SIGA方法。该方法在高维输入空间中，无论样本序列如何，都具有鲁棒性和准确性，解决了QMCS的低收敛速度问题，解决了随机加载下的随机动态响应概率密度函数问题。首先，采用平稳高斯随机过程模拟技术，基于多个相互独立的随机变量构建随机加载的多维输入空间;在IGA框架下，采用基于von Kármán应变-位移关系的HSDT模型对热环境下随机载荷作用下的非线性FGM板模型进行建模。随后，在RBFNN技术的基础上，提出了一种嵌套无创动态响应面分析方法SIGA-RBFNN。随机加载下FGM板的响应分析表明，与基于张量积的SIGA方法相比，SIGA- rbfnn受样本序列类型的影响较小。它有效地解决了高维随机性问题，并在鲁棒性、准确性和效率方面具有显著的优势。最后，SIGA-RBFNN补偿了QMCS收敛速度慢的缺点，成功地求解了随机载荷作用下FGM板位移响应统计和概率密度函数。

Experimental study on the effects of temperature on mechanical properties of 3D printed continuous carbon fiber reinforced polymer (C-CFRP) composites

Xiaohang Jia, Junjie Luo, Quantian Luo, Qing Li, Tong Pang

doi:10.1016/j.tws.2024.112465

温度对3D打印连续碳纤维增强聚合物(C-CFRP)复合材料力学性能影响的实验研究

Design for safety of 3D printed continuous carbon fiber reinforced polymer (C-CFRP) composites remains challenging for accommodating harsh service environments with a wide range of temperatures. To investigate thermal effects on mechanical properties and failure mechanism of C-CFRP materials, this study carried out a series of experimental tests on the laminates with layups of [0]n, [90]n and [0/90]n for tension, as well as [±45]n for in-plane shearing. The application of classical laminate theory and rule of mixtures to the 3D printed C-CFRP composites under varying temperatures is then evaluated. The results indicate that the transverse elastic modulus/strength and in-plane shear modulus/strength increase at a low temperature, but all the mechanical properties decrease at a high temperature. Notably, an unexpected decrease in strength of [0/90]n laminates is observed when the temperature drops from -10 °C to -40 °C. Significant strain concentrations are visualized during tensile experiments at high temperature through the digital image correlation (DIC) technique. With increasing temperature, the [0]n laminates undergo a transition from an explosive to a jagged failure mode, while the [90]n laminates shift from brittle to ductile failure. The alteration is attributed to decrease in the mechanical properties of both the matrix and the matrix fiber interface, as revealed by scanning electron microscopy (SEM) analysis. It is found that although the classical laminate theory exhibits an acceptable prediction accuracy for the 3D printed C-CFRP composites under varying temperature conditions, the rule of mixtures is not applicable. For this reason, the new formulations for the rule of mixtures are then proposed to enable accurate predictions for 3D printed C-CFRP composites under different temperatures. This study is anticipated to provide insightful understanding on mechanical properties and failure mechanisms for 3D printed C-CFRP composites at different temperatures.

3D打印连续碳纤维增强聚合物(C-CFRP)复合材料的安全性设计仍然具有挑战性，因为它可以适应各种温度的恶劣使用环境。为了研究热效应对C-CFRP材料力学性能的影响及破坏机理，本研究对拉伸层数为[0]n、[90]n和[0/90]n、面内剪切层数为[±45]n的层压板进行了一系列试验试验。然后评价了经典层压理论和混合规律在不同温度下3D打印C-CFRP复合材料中的应用。结果表明:低温下横向弹性模量/强度和面内剪切模量/强度增大，高温下力学性能下降;值得注意的是，当温度从-10°C降至-40°C时，观察到[0/90]n层压板的强度意外下降。通过数字图像相关(DIC)技术，实现了高温拉伸实验中显著应变浓度的可视化。随着温度的升高，[0]n层合板由爆炸破坏模式转变为锯齿破坏模式，[90]n层合板由脆性破坏模式转变为韧性破坏模式。扫描电镜(SEM)分析表明，这种变化是由于基体和基体纤维界面的力学性能下降所致。研究发现，尽管经典层压理论对3D打印C-CFRP复合材料在变温度条件下的预测精度尚可，但混合规律不适用。因此，提出了混合规则的新公式，以便在不同温度下对3D打印的C-CFRP复合材料进行准确预测。该研究有望为3D打印C-CFRP复合材料在不同温度下的力学性能和失效机制提供深刻的理解。

Axial Compression Behaviour of Circular Concrete-Filled Stainless-Clad Bimetallic Steel Tubular Stub Columns

Huiyong Ban, Zhuo Zeng, Zijian Chen, Yongjiu Shi, Yuanqing Wang

doi:10.1016/j.tws.2024.112468

圆形不锈钢包覆双金属钢管混凝土短柱轴压性能研究

The axial compression behaviour of circular concrete-filled stainless-clad bimetallic steel tubular (CFSCBST) stub columns is addressed in this paper by experimental and numerical investigations. A total of five specimens were fabricated and subjected to axial compression loading. The varying parameters in the experimental study included the clad ratio of steel tube, the diameter-to-thickness ratio and the strength of the concrete. A three-dimensional finite element (FE) model was developed and validated against both dependent and independent test data to further study the axial compressive behaviour of circular CFSCBST stub columns in this paper. The parametric studies considering five major parameters, including the strength of the concrete, the substrate steel grade, the clad ratio, the diameter-to-thickness ratio and different bonding conditions of the stainless-clad (SC) bimetallic steel, were carried out by using the verified FE model. The applicability of existing design codes to the circular CFSCBST stub columns was further analysed through comparisons with the numerical results. New design methods based on unified and superposition theory have been proposed herein, which have improved accuracy for predicting the ultimate compression capacity of such circular CFSCBST stub columns.

本文通过试验和数值研究对圆形不锈钢包层双金属钢管混凝土短柱的轴压性能进行了研究。共制作了5个试件，并进行了轴压加载。试验研究中的变化参数包括钢管包层比、径厚比和混凝土强度。为了进一步研究圆形CFSCBST短柱的轴压特性，本文建立了三维有限元模型，并对相关和独立试验数据进行了验证。采用验证的有限元模型，考虑混凝土强度、基材钢种、包层比、径厚比和不同粘结条件等5个主要参数对不锈钢包层双金属钢进行了参数化研究。通过与数值结果的比较，进一步分析了现有设计规范对圆形CFSCBST短柱的适用性。提出了基于统一和叠加理论的新设计方法，提高了圆形CFSCBST短柱极限抗压能力的预测精度。