【新文速递】2024年7月19日固体力学SCI期刊最新文章

今日更新：Journal of the Mechanics and Physics of Solids 2 篇，Thin-Walled Structures 10 篇Journal of the Mechanics and Physics of SolidsHyperinelasticity: An energy-based constitutive modelling approach to isothermal large inelastic deformation of polymers. Part IAfshin Anssari-Benamdoi:10.1016/j.jmps.2024.105790超非弹性:聚合物等温大非弹性变形的能量本构建模方法。第一部分The foundation of a new concept, coined here as hyperinelasticity, is presented in this work for modelling the isothermal elastic and inelastic behaviours of polymers. This concept is based on the premise that both the elastic and inelastic behaviours of the subject specimen in the primary loading path may be characterised by a single constitutive law derived from a comprehensive deformation energy W , akin to hyperelasticity, whose constitutive parameters determine and capture both the elastic and inelastic behaviours without the need for additional flow/yield/damage parameters. This core hyperinelastic model captures the elastic and inelastic behaviours in the primary loading path. It is then further specialised, by augmenting the embedded constitutive parameters in the core model, for capturing the inelasticity of the unloading behaviour and the rate of deformation effects. The former is done by devising and incorporating a discontinuous inelasticity variable into the core function, and the latter is achieved by considering that the core model parameters can evolve with, i.e., be a function of, the deformation rate. Examples of the application of the core and augmented hyperinelastic models to a wide range of extant experimental datasets will be presented, ranging from foams, glassy and semi-crystalline polymers to hydrogels and liquid crystal elastomers. The loading modes encompass both tensile and compressive deformations. With a reduced set of number of model parameters (compared with the existing models in the literature), simplicity of implementation (as essentially a straightforward extension to hyperelasticity), and encouraging accuracy in the modelling results, the concept of hyperinelasticity together with the presented hyperinelastic model are proposed as a unified modelling means for capturing the elastic and inelastic behaviours of polymers.本研究提出了一个新概念的基础，即超弹性，用于模拟聚合物的等温弹性和非弹性行为。这一概念的前提是，主体试样在主要加载路径上的弹性和非弹性行为都可以用一个由综合变形能量 W 得出的单一构成定律来表征，类似于超弹性，其构成参数决定并捕捉弹性和非弹性行为，而无需额外的流动/屈服/损伤参数。这种核心超弹性模型可以捕捉主要加载路径中的弹性和非弹性行为。然后，通过增加核心模型中的嵌入式构造参数，对其进行进一步专门化，以捕捉非弹性的卸载行为和变形率效应。前者是通过设计并在核心函数中加入一个不连续的非弹性变量来实现的，后者则是通过考虑核心模型参数可随变形率变化（即变形率的函数）来实现的。将举例说明核心模型和增强超弹性模型在各种现有实验数据集中的应用，包括泡沫、玻璃和半结晶聚合物、水凝胶和液晶弹性体。加载模式包括拉伸和压缩变形。由于模型参数数量减少（与文献中的现有模型相比）、实施简单（基本上是对超弹性的直接扩展）以及建模结果令人鼓舞的准确性，超弹性概念和所提出的超弹性模型被建议作为捕捉聚合物弹性和非弹性行为的统一建模手段。Magneto-mechanically derived diffusion processes in ultra-soft biological hydrogelsJorge Gonzalez-Rico, Sara Garzon-Hernandez, Chad M. Landis, Daniel Garcia-Gonzalezdoi:10.1016/j.jmps.2024.105791超软生物水凝胶中磁机械衍生的扩散过程Magneto-active hydrogels (MAHs) consist of a polymeric network doped with magnetic particles that enable the material to mechanically respond to magnetic stimuli. This multifunctionality allows for modulation of mechanical properties in a remote and dynamic manner. These characteristics combined with the biocompatibility of hydrogels, make MAHs excellent for drug delivery and biological scaffolds. In this work, ultra-soft biological MAHs with strong magnetostriction are fabricated from human blood plasma ( ∼ 20 Pa). The material is experimentally tested using a novel in house device that allows for a precise control of magnetic actuation conditions, enabling the hydrogel modulation in terms of mechanical deformation and stiffness. We study the impact of magnetic actuation on the solvent expulsion and diffusion dynamics within the polymeric network. To further elucidate the mechanisms driving solvent diffusion processes, a computational framework for modeling the diffusion process of two different species within a magneto-responsive material is proposed. These experimental and computational outcomes open exciting new opportunities for the use of ultra-soft MAHs in bioengineering applications.磁活性水凝胶(MAHs)由掺杂磁性颗粒的聚合物网络组成，使材料能够对磁刺 激做出机械反应。这种多功能性允许以远程和动态的方式调节机械性能。这些特性与水凝胶的生物相容性相结合，使MAHs成为药物递送和生物支架的绝佳选择。在这项工作中，用人血浆(~ 20 Pa)制备了具有强磁致伸缩的超软生物mah。该材料使用一种新颖的内部设备进行实验测试，该设备允许精确控制磁驱动条件，使水凝胶能够在机械变形和刚度方面进行调制。我们研究了磁驱动对聚合物网络中溶剂排出和扩散动力学的影响。为了进一步阐明驱动溶剂扩散过程的机制，提出了一种模拟两种不同物质在磁响应材料内扩散过程的计算框架。这些实验和计算结果为超软MAHs在生物工程应用中的应用开辟了令人兴奋的新机会。Thin-Walled StructuresDecentralised H robust control of MTMDs for mitigating vibration of a slender MDOF floor configurationWai Kei Ao, Qing-Chen Tang, Aleksandar Pavicdoi:10.1016/j.tws.2024.112226用于缓解细长 MDOF 楼板结构振动的 MTMD 的分散 H 鲁棒控制In this research, a novel robust decentralised H (H∞ and H2) design combined with a pattern search method (PSM), incorporating considerations of multiple modal dynamics, was developed to address the vibration issue in slender structures. To verify the effectiveness of the concept, a full-scale laboratory reconfigurable multiple degrees of freedom (MDOF) test-bed floor panel structure was selected, equipping with a passive multiple-tuned mass damper (MTMD) as a coupling system. The optimal parameters of the MTMDs were tailored using the decentralised H design and the PSM, considering the dynamic engagement of multiple modes. Furthermore, a crucifix-type configuration of 2DOF MTMDs was proposed to mitigate the vibration of the floor panel structure. Full-scale forced vibration testing (FVT) was conducted to validate the dynamic performance of the 2DOF MTMDs. The test results provide satisfactory verification and high-quality curve-fitting testing data for parameter study and dynamic simulation. By examining the field data from the 2DOF MTMDs and performing various numerical simulations and analyses, the control performance robustness of the MTMDs was comprehensively evaluated, considering practical engineering variations such as the number and stiffness of MTMDs, as well as the stiffness and mass of the floor panel structure. As a result, the proposed H control strategies for the MTMDs demonstrated robust control capabilities by effectively dissipating significant amounts of externally applied energy.在这项研究中，开发了一种结合模式搜索法（PSM）的新型稳健分散 H（H∞ 和 H2）设计，其中考虑了多模态动力学因素，以解决细长结构的振动问题。为验证该概念的有效性，选择了一个全尺寸实验室可重构多自由度（MDOF）试验台楼板结构，并配备了一个被动多调谐质量阻尼器（MTMD）作为耦合系统。考虑到多种模式的动态参与，利用分散 H 设计和 PSM 对 MTMD 的最佳参数进行了定制。此外，还提出了一种十字架型 2DOF MTMD 配置，以减轻楼板结构的振动。为验证 2DOF MTMD 的动态性能，进行了全尺寸强迫振动测试 (FVT)。测试结果为参数研究和动态模拟提供了令人满意的验证和高质量的曲线拟合测试数据。通过检查 2DOF MTMD 的现场数据并进行各种数值模拟和分析，综合评估了 MTMD 的控制性能鲁棒性，同时考虑了实际工程变化，如 MTMD 的数量和刚度，以及楼板结构的刚度和质量。结果表明，针对 MTMD 提出的 H 控制策略能够有效消散大量外部施加的能量，表现出强大的控制能力。Behavior of Steel Plate Shear Walls Reinforced with Stiffened FRP PlatesYipeng Du, Yongbo Shao, Changgen Wu, Mingzhou Su, Min Zhang, Yifang Caodoi:10.1016/j.tws.2024.112236加筋FRP板加固钢板剪力墙的性能研究Steel plate shear walls require retrofitting due to factors such as corrosion, long–term loading and functional changes. In an effort to modernise the technology used for strengthening and retrofitting steel plate shear walls, fibre–reinforced polymer (FRP) plates with additional stiffeners are employed to enhance the shear capacity of steel structures. In this study, the static properties of steel plates reinforced with these stiffened FRP plates were experimentally investigated. The application of this strengthening methodology substantially enhanced the out–of–plane stability, shear stiffness and bearing capacity of the plates, while also reducing fatigue damage. Equations for estimating the buckling and ultimate load of steel plates reinforced with stiffened FRP plates have been derived, enabling predictions of their practical performance. Finite element models incorporating the potential failure of epoxy at the FRP–steel interface were developed for further analysis. A numerical study was performed to investigate the optimal thickness of the FRP stiffener. The analysis revealed that stiffener thicknesses exceeding 6 mm did not significantly contribute to the enhancement of the load–bearing capacity or to the prevention of debonding. When the FRP rib thickness exceeds 6mm, the economy was poor. The aforementioned findings are of considerable engineering importance, especially in the context of improving fatigue properties and shear load–bearing capacity of thin steel plates.由于腐蚀、长期荷载和功能变化等因素，钢板剪力墙需要进行改造。为了使加固和改造钢板剪力墙的技术现代化，我们采用了带有额外加强筋的纤维增强聚合物(FRP)板，以提高钢结构的抗剪能力。在这项研究中，试验研究了这些加筋玻璃钢板加固钢板的静力性能。这种强化方法的应用大大提高了板的面外稳定性、剪切刚度和承载能力，同时也减少了疲劳损伤。推导了用增强FRP板加固钢板的屈曲和极限载荷的估计方程，从而能够预测其实际性能。为了进一步分析，建立了考虑frp -钢界面环氧树脂潜在破坏的有限元模型。对玻璃钢加劲筋的最佳厚度进行了数值研究。分析表明，加劲筋厚度超过6 mm对增强承载能力或防止脱粘没有显著贡献。当FRP筋厚度超过6mm时，经济性较差。上述发现具有相当大的工程重要性，特别是在提高薄钢板的疲劳性能和剪切承载能力方面。Non-linear Dynamics and Bandgap Control in Magneto-Rheological elastomers Metamaterials with Inertial AmplificationDongshuo Yang, Xiangying Guo, Weixing Zhang, Dongxing Caodoi:10.1016/j.tws.2024.112237惯性放大磁流变弹性体超材料的非线性动力学与带隙控制Sandwich plate structures are extensively utilized in engineering due to their favorable stiffness-to-weight ratio. Nonetheless, these lightweight thin-walled structures frequently encounter challenges related to inadequate low-frequency vibration performance, which significantly restricts their applications, particularly in the realm of precision instruments which is sensitive to vibration. This study introduces an innovative design of an active nonlinear metamaterial, to achieve tunable broadband low-frequency bandgaps for sandwich plates. The nonlinear oscillator incorporates an inertia amplification mechanism (IAM), Euler-buckled beams, mass elements, and magneto-rheological elastomers (MREs), which are modulated via external magnetic fields to adjust the material's stiffness dynamically. Employing Hamilton's principles and the plate wave expansion method (PWE), the dispersion relations for the metamaterial plate are derived, elucidating the dispersion surfaces and the band structures within its sandwich-like plates.The dynamical equations of the metamaterial plate are formulated and validated through numerical simulations using the Galerkin method, confirming the theoretical predictions. The results demonstrate effective control over low-frequency and broadband bandgaps under low mass ratio conditions through strategic manipulation of the inertia amplification factor and magnetic flux. The study extensively explores the nonlinear dynamic responses of the metamaterial, highlighting the significant impact of excitation amplitudes on the amplitude-dependent bandgaps.夹层板结构由于具有良好的刚度-重量比，在工程中得到了广泛的应用。然而，这些轻质薄壁结构经常遇到与低频振动性能不足相关的挑战，这极大地限制了它们的应用，特别是在对振动敏感的精密仪器领域。本研究提出一种创新设计的有源非线性超材料，以实现可调谐的宽带低频带隙夹层板。非线性振荡器包含惯性放大机构(IAM)、欧拉屈曲梁、质量单元和磁流变弹性体(MREs)，通过外部磁场进行调制，以动态调节材料的刚度。利用哈密顿原理和平板波展开法，推导了超材料平板的色散关系，阐明了三明治状平板内的色散面和带结构。利用伽辽金方法建立了超材料板的动力学方程，并进行了数值模拟验证，证实了理论预测。结果表明，在低质量比条件下，通过对惯性放大因子和磁通的策略控制，可以有效地控制低频和宽带带隙。该研究广泛探讨了超材料的非线性动态响应，强调了激发振幅对振幅相关带隙的重要影响。Fire tests of short-span LSF floor systems made of lipped channel joistsFatheen Hisham, Son Tung Vy, Mahen Mahendran, Anthony Ariyanayagam, Tuan Ngodoi:10.1016/j.tws.2024.112257唇形槽梁短跨LSF楼板系统的防火试验Light gauge steel framed (LSF) floor systems are increasingly used in low- and mid-rise buildings due to their superiorities in terms of load-bearing capacity, non-combustibility, durability, sustainability, and ease of fabrication and erection. Their behaviour is detrimentally affected by fire, resulting in the reduction of their bending capacity and stiffness. Previous research studies on LSF floor systems are limited, with most studies not focussing on the Australian floor systems. This research study evaluates the behaviour of short-span load-bearing LSF floor systems through one ambient temperature test and six fire tests. Test results revealed that cavity insulation has minimal impact on the fire resistance levels (FRL) of LSF floors protected by two or three layers of fire-rated gypsum plasterboards. Increasing the plasterboard thickness or adding an extra layer significantly enhanced the FRL. Plasterboard joints in the ceiling were identified as potential vulnerabilities, while enhancing their performance would lead to higher FRL for the floor system. Importantly, the cold flange temperature was shown to be the critical parameter governing the failure of channel joists in LSF floors. This study has shown that the structural and thermal behaviour of the tested short-span load-bearing floors was consistent to that observed in the previous full-scale LSF floor tests reported in the literature. Hence such short-span load-bearing floor tests can be used to determine the FRLs at significantly reduced cost and time. Finally, some design recommendations are provided, offering valuable insights for fire design engineers.轻钢框架(LSF)地板系统由于其在承载能力、不燃性、耐久性、可持续性以及易于制造和安装方面的优势，越来越多地用于低层和中层建筑。它们的行为受到火灾的不利影响，导致它们的弯曲能力和刚度降低。以往对LSF地板系统的研究是有限的，大多数研究没有集中在澳大利亚的地板系统上。本研究通过一次环境温度试验和六次火灾试验，评估了短跨承重LSF楼板系统的性能。测试结果显示，空腔隔热对由两层或三层防火石膏板保护的低密度地板的耐火等级(FRL)影响最小。增加石膏板的厚度或增加额外的一层，可显著提高FRL。天花板上的石膏板接缝被确定为潜在的漏洞，而增强其性能将导致地板系统的更高FRL。重要的是，冷法兰温度被证明是控制LSF楼板通道托梁破坏的关键参数。这项研究表明，测试的短跨承重楼板的结构和热行为与文献中报道的先前全尺寸LSF楼板测试中观察到的一致。因此，这种短跨度承重楼板试验可用于在显著降低成本和时间的情况下确定最低限度。最后，提出了一些设计建议，为消防设计工程师提供了有价值的见解。Shape Optimization of Cast Steel Tubular Joints Based on Subdivision Surface and Genetic AlgorithmGen Li, Zhengning Li, Qiang Zeng, Xiaonong Guodoi:10.1016/j.tws.2024.112258基于细分曲面和遗传算法的铸钢管接头形状优化Cast steel tubular (CST) joints are extensively employed in steel structures for their excellent integrity and mechanical performance. However, the diverse configurations of CST joints result in the absence of standard verification formulas, leading to inefficient trial-and-error design approaches. To tackle this issue, this paper introduces a novel shape optimization method for CST joints that integrates subdivision surface techniques with genetic algorithms. The method comprises three key components: geometric modeling, structural analysis, and optimization algorithm, with shape optimization achieved through their collaborative operation. Applied to two types of CST joints, this approach resulted in significant reductions in joint volume by 39.2% and structural stress by 49.0%, respectively. The shape-optimized joints were compared with topology-optimized joints from published literatures, and demonstrated enhanced mechanical performance while presenting superior manufacturability. The proposed method offers considerable advantages over traditional trial-and-error approaches and topology optimization methods. It generates designs with continuous and smooth boundaries, better suited for the conventional casting process, and overcomes manufacturability issues of topology optimization. Additionally, the genetic algorithm allows for flexible selections of optimization objectives, addressing the restrictions of topology optimization methods. Furthermore, the method's high level of automation is anticipated to expedite the joint design process, significantly reducing the requirement for manual intervention.铸钢管结点以其良好的整体性和力学性能在钢结构中得到了广泛的应用。然而，由于CST节点结构的多样性，导致缺乏标准的验证公式，从而导致低效的试错设计方法。为了解决这一问题，本文提出了一种结合细分曲面技术和遗传算法的CST节点形状优化方法。该方法包括几何建模、结构分析和优化算法三个关键部分，通过它们的协同操作实现形状优化。将该方法应用于两种CST节理时，节理体积和结构应力分别显著减小了39.2%和49.0%。将形状优化后的关节与已有文献中拓扑优化后的关节进行了比较，结果表明，优化后的关节在具有优异的可制造性的同时，力学性能也得到了提高。与传统的试错法和拓扑优化方法相比，该方法具有相当大的优势。它生成具有连续和光滑边界的设计，更适合传统的铸造工艺，并克服了拓扑优化的可制造性问题。此外，遗传算法允许灵活选择优化目标，解决拓扑优化方法的局限性。此外，该方法的高度自动化有望加快接头设计过程，显著减少人工干预的需求。Energy absorption characteristics of expansion tube subjected to the coupled loading in near-field explosionZizhen Qi, Yuwu Zhang, Minzu Liang, Wen Liang, Yuliang Lindoi:10.1016/j.tws.2024.112259近场爆炸耦合载荷作用下膨胀管的能量吸收特性Expansion tube structures (ETSs) are extensively employed as energy-absorbing components in protective structures, yet their dynamic response under near-filed explosion remains inadequately understood, which limits their applications in anti-explosion devices. This paper investigates the response of ETS through explosion experiments, testing both the overpressure history of blast loading and the propagation process of detonation products. Following experimental verification, finite element models are established to obtain the characteristics of explosive loading and the response of ETS. The findings demonstrate that as the velocity of slider increases, the embedding displacement of ETS exceeding its limit induces a local buckling transformation in thin-wall tubes from one end buckling to simultaneous buckling at both ends. In the scaled distance range of 0.4 - 0.5 m/kg1/3, the energy absorption (EA) of ETS under different explosive masses exhibits distinct trends as the scaled distance increases, despite the decrease in peak pressure of blast loading. This is due to the coupling effect between blast shock waves and detonation products, resulting in diverse alterations in specific impulse with increasing scaled distance for varying explosive masses. In the case of oblique impact of blast loading, the percentage decrease in EA within the near-field range (Z < 0.8 m/kg1/3) is higher than that at mid-to-far range due to the uneven and random ejection of detonation products. The study elucidates the dynamic response of ETS under the coupled loading of blast wave and blast products, and provides valuable insights for optimizing designs of ETS utilized in near-field blast-resistant structures.膨胀管结构作为吸能构件广泛应用于防护结构中，但其近场爆炸动力响应研究尚不充分，限制了其在防爆装置中的应用。本文通过爆炸实验研究了ETS的响应，测试了爆炸载荷的超压历史和爆轰产物的传播过程。在实验验证的基础上，建立了有限元模型，得到了爆炸载荷特性和ETS的响应。结果表明:随着滑块速度的增加，ETS超过其极限的嵌入位移会导致薄壁管局部屈曲转变，由一端屈曲向两端同时屈曲转变;在0.4 ~ 0.5 m/kg1/3的标尺距离范围内，不同炸药质量下ETS的能量吸收(EA)随标尺距离的增加呈现出明显的变化趋势，尽管爆炸载荷峰值压力有所降低。这是由于爆炸激波与爆轰产物之间的耦合作用，导致不同爆炸质量的比冲随比例距离的增加而发生不同的变化。在爆炸载荷斜冲击的情况下，由于爆轰产物的抛射不均匀和随机，近场范围内(Z < 0.8 m/kg1/3)的EA下降百分比高于中远范围。该研究阐明了爆炸冲击波与爆炸产物耦合作用下ETS的动力响应，为ETS在近场抗爆结构中的优化设计提供了有价值的见解。Ultimate In-Plane Shear Capacity of 3-Panel Frameless Cold-Form Steel Corrugated Walls Under Axial CompressionJingfei Huang, T.Y. Yang, Musab A.Q. Al-Janabidoi:10.1016/j.tws.2024.112260轴压作用下3板无框冷弯型钢波纹墙的极限面内抗剪能力The Frameless building system, developed by BEHLEN Industries LP, is a structural system that incorporates Cold Form Steel Corrugated Wall (CFSCW) components. These include walls, ceilings, and roofs formed by Frameless panels, along with footings, boundary columns, and an optional convex truss. The system employs simple bolt connections, enabling rapid construction without the need for heavy machinery. It is particularly cost-effective and is often utilized in regions with low seismic activity. In high seismic zones, the structural performance of The Frameless building system under combined compression and lateral loads has not been systematically examined. In this study, four full-scale 3-panel Frameless CFSCWs, were tested under combined axial and shear loads. A generic finite element model was proposed to simulate the force-deformation responses and deformed shapes of the 3-panel Frameless CFSCWs. The numerical simulation results were verified using the experimental results. The verified numerical model was then used in parameter study to examine the ultimate shear capacity of 3-panel Frameless CFSCW of different wall thickness, with the presence of axial compression. The results of the study revealed the ultimate shear capacity of 3-panel Frameless CFSCW is linearly correlated with gauge thickness of the wall panel.由BEHLEN Industries LP开发的无框架建筑系统是一种结合冷型钢波纹墙(CFSCW)组件的结构系统。这些包括由无框面板组成的墙壁、天花板和屋顶，以及基础、边界柱和可选的凸桁架。该系统采用简单的螺栓连接，无需重型机械即可快速施工。它特别具有成本效益，通常用于地震活动较少的地区。在高震区，无框架建筑体系在压缩和侧向荷载联合作用下的结构性能尚未得到系统的研究。在这项研究中，四个全尺寸的3板无框架cfscw，在轴剪联合荷载下进行了测试。提出了一种通用有限元模型来模拟3板无框架cfscw的力-变形响应和变形形状。用实验结果验证了数值模拟结果。将验证后的数值模型应用于参数研究中，考察了轴压作用下不同壁厚的3板无框架CFSCW的极限抗剪能力。研究结果表明:3板无框架CFSCW的极限抗剪承载力与墙板规范厚度呈线性相关;Moment capacity of perforated cold-formed aluminium channels-Tests, analysis, and designBikram Paul, Krishanu Roy, Yuanyi Ji, Zhiyuan Fang, Vivekanandan Sivaji, James B.P Limdoi:10.1016/j.tws.2024.112261冷弯铝孔道的弯矩承载力。试验、分析和设计This paper investigates the moment capacity of perforated cold-formed aluminium alloy (CFAA) channel sections through a combination of experimental and numerical studies. In total, 12 new experimental tests were conducted on CFAA with different cross-section sizes, web hole spacing, and numbers of web holes, under pure bending, followed by a numerical study comprising 601 validated finite element (FE) models. In the numerical study, the effects of various parameters were examined, namely web hole size, the number of web holes, section thickness, web depth, and the grade of aluminium alloy. The moment capacities obtained from both the experimental tests and finite element analysis (FEA) were utilized to evaluate the design guidance provided in the Aluminium Design Manual (ADM), Eurocode (EC), Australian and New Zealand Standard (AS/NZ), and the American Iron and Steel Institute (AISI) standards. Along with the Direct Strength Method (DSM), the Continuous Strength Method (CSM) was also evaluated. The results from both the experimental tests and their FEA indicate that DSM and EC9 are slightly unconservative, by 1% and 9%, respectively. In contrast, ADM is found to be conservative by 10%, whereas CSM is found to be unconservative by 50%.本文采用实验与数值相结合的方法对冷弯铝合金孔道截面的弯矩承载力进行了研究。在纯弯曲条件下，对不同截面尺寸、腹板孔间距和腹板孔数的CFAA进行了12次新试验，并对601个已验证的有限元模型进行了数值研究。在数值研究中，考察了腹板孔尺寸、腹板孔数、截面厚度、腹板深度和铝合金等级等参数对成形的影响。利用从试验测试和有限元分析(FEA)中获得的弯矩容量来评估铝设计手册(ADM)、欧洲规范(EC)、澳大利亚和新西兰标准(AS/NZ)以及美国钢铁协会(AISI)标准中提供的设计指南。在直接强度法(DSM)的基础上，对连续强度法(CSM)进行了评价。试验和有限元分析结果均表明，DSM和EC9的非保守性分别为1%和9%。相比之下，ADM的保守性为10%，而CSM的非保守性为50%。Thermo-mechanical Coupled Three-dimensional Finite Element Simulation Analysis of Drilling Thermoplastic Braided Carbon Fiber Composite and Optimization of Process ParametersYong Liu, Jiadong Huang, Tianyu Wang, Pan Sun, Honggen Zhoudoi:10.1016/j.tws.2024.112263热塑性编织碳纤维复合材料钻孔热-机耦合三维有限元模拟分析及工艺参数优化Optimizing the process parameters of thermoplastic composites during drilling is paramount for mitigating tearing, delamination, and other forms of damage, while simultaneously enhancing the tensile strength and extending the long-term service life of the overall structure. This study focuses on exploring a thermal-mechanical coupling method for predicting dynamic mechanical progressive failure and determining optimal process parameters during the drilling of Braided Carbon Fiber Reinforced Polyether Ether Ketone (BCF/PEEK). Initially, a thermal conduction constitutive model of BCF/PEEK was developed based on the proposed thermal distribution ratio calculation method. Concurrently, a user-defined material subroutine VUMAT and a bilinear cohesive element model, were implemented on the ABAQUS/Explicit platform to simulate the delamination behaviors of drilling BCF/PEEK using a tapered drill-reamer. Subsequently, a comprehensive BCF/PEEK drilling experiment platform was constructed, and the simulation accuracy of the drilling finite element (FE) model was verified through temperature, thrust force, and hole-wall morphology analyses. Finally, response surface regression models were established for process parameters, and the optimal parameters were predicted and validated. The results indicate that minimum thrust force and temperature can be achieved using the tapered drill-reamer with a spindle speed set at 4878.79/3000 r/min and a feed speed of 34.04/30 mm/min, respectively, with a maximum error of only 8.78%.在钻孔过程中优化热塑性复合材料的工艺参数对于减轻撕裂、分层和其他形式的损伤至关重要，同时提高抗拉强度并延长整体结构的长期使用寿命。针对编织碳纤维增强聚醚醚酮(BCF/PEEK)在钻孔过程中的动态力学渐进失效预测和最佳工艺参数确定，研究了一种热-力耦合方法。首先，基于提出的热分配比计算方法，建立了BCF/PEEK的导热本构模型。同时，在ABAQUS/Explicit平台上实现了用户定义的材料子程序VUMAT和双线性内聚元素模型，模拟了使用锥形钻扩刀钻取BCF/PEEK的分层行为。随后，搭建了BCF/PEEK钻井综合实验平台，并通过温度、推力和孔壁形貌分析验证了钻井有限元模型的仿真精度。最后建立了工艺参数的响应面回归模型，并对最优工艺参数进行了预测和验证。结果表明:当主轴转速为4878.79/3000 r/min，进给速度为34.04/30 mm/min时，锥形钻扩刀的推力和温度最小，最大误差仅为8.78%;Axial Compression Behaviour of Square Concrete-Filled Stainless-Clad Bimetallic Steel Tubular Stub ColumnsZhuo Zeng, Peng Dai, Zijian Chen, Yongjiu Shi, Huiyong Bandoi:10.1016/j.tws.2024.112264方形不锈钢包覆双金属钢管混凝土短柱轴压性能研究Concrete-filled stainless-clad bimetallic steel tube (CFSCBST) members combines the advantages of excellent corrosion-resistance and good economy compared with conventional concrete-filled steel tube (CFST) members, which has great prospects in engineering application. This paper presents a comprehensive experimental and numerical investigation into the axial compression behaviour of CFSCBST stub columns with square sections. A total of eight specimens was conducted on CFSCBST specimens, incorporating varying width-to-thickness ratios, clad ratios and steel strengths, The experimental investigation provided a detailed report on failure modes, load versus displacement and strain response. The experimental results were utilized in a parallel numerical simulation to validate the finite element (FE) model. Subsequently, an extended parametric analysis was conducted to investigate the influence of the strength of the concrete, the substrate steel grade, the clad ratio, and the width-to-thickness ratio were carried out. The data obtained from tests and numerical studies were used to evaluate the applicability of existing design codes AISC/ANSI 360-22, EN 1994-1-1, GB 50936-2014 and DBJ/T 13-51-2020 for predicting the compressive capacity of square CFSCBST stub columns. Overall, a modified design method was proposed, adapted from DBJ/T 13-51-2020, was proposed for CFSCBST stub columns, demonstrating enhanced accuracy in predictions.不锈钢包覆双金属钢管混凝土构件与传统钢管混凝土构件相比，具有优良的耐腐蚀性能和良好的经济性，具有广阔的工程应用前景。本文对方截面CFSCBST短柱的轴压性能进行了全面的试验和数值研究。在不同宽厚比、包层比和钢强度的CFSCBST试件上共进行了8个试件的试验研究，提供了详细的破坏模式、荷载-位移和应变响应报告。利用实验结果进行了并行数值模拟，验证了有限元模型的有效性。随后，进行了扩展参数分析，研究了混凝土强度、基材钢等级、包层比和宽厚比对结构的影响。利用试验和数值研究数据，评估了现有设计规范AISC/ANSI 360-22、EN 1994-1-1、GB 50936-2014和DBJ/T 13-51-2020对方形CFSCBST短柱抗压能力预测的适用性。总体而言，本文提出了一种基于DBJ/T 13-51-2020的CFSCBST短柱改进设计方法，提高了预测的准确性。来源：复合材料力学仿真Composites FEM