【新文速递】2024年2月15日复合材料SCI期刊最新文章_ACT_Mechanical_System_MAGNET_Deform_复合材料_ECAD_参数优化_材料_多尺度_仿生

【新文速递】2024年2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，Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 1 篇Journal of the Mechanics and Physics of SolidsA reactive electrochemomechanical theory for growth and remodeling of polyelectrolyte hydrogels and application to dynamic polymerization of DNA hydrogelsBrandon K. Zimmerman, Bibekananda Datta, Ruohong Shi, Rebecca Schulman, Thao D. Nguyendoi:10.1016/j.jmps.2024.105568聚电解质水凝胶生长和重塑的反应电化学机械理论及其在 DNA 水凝胶动态聚合中的应用This study develops a framework for growth and remodeling of active polyelectrolyte hydrogels that accounts for effects of compositional changes on the mechanical response. By developing a reactive electrochemomechanical theory, thermodynamical constraints upon reactive and remodeling processes are elucidated within a general framework that allows any number of chemical reactions to evolve the response of the gel and transfer mass and charge between constituents. Fully coupled, nonlinear constitutive relations are adopted for molar fluxes, allowing exploration of effects including cross-diffusion, electrophoresis, and electro-osmosis. A robust finite element implementation is developed in the open source FEBio software (febio.org) by exploiting an equivalence between electrochemomechanics and mixture theory. The implementation is verified against analytical solutions for free swelling, and a proper reduction to a prior chemomechanical theory is demonstrated for neutral gels swollen only by a solvent with no solutes. The theory and implementation are then applied to model the tunable large swelling achieved through dynamic polymerization of DNA crosslinkers seen in our recently developed experimental hydrogel system (Cangialosi et al., 2017). A novel constitutive model for reaction-driven evolution of the locking stretch λL in a non-Gaussian mechanical free energy was developed, where the increasing concentration of DNA crosslinkers makes further swelling energetically favorable. With a single free parameter, excellent agreement was found between measured and predicted equilibrium swelling ratios. This study demonstrated the ability to extend the electrochemomechanical framework to include chemical reactions and composition-aware constitutive models, and showed that development of reactive models allows simulation of complex dynamic polymerization phenomena not treated before. The theoretical frame here can be further expanded in scope to incorporate additional non-ideal and nonlinear phenomena.本研究为活性聚电解质水凝胶的生长和重塑建立了一个框架，该框架考虑了成分变化对机械响应的影响。通过发展反应电化学机械理论，在一个允许任何数量的化学反应来改变凝胶反应并在成分间传递质量和电荷的通用框架内，阐明了反应和重塑过程的热力学约束。摩尔通量采用完全耦合的非线性构成关系，允许探索包括交叉扩散、电泳和电渗在内的效应。利用电化学力学和混合物理论之间的等效性，在开源 FEBio 软件（febio.org）中开发了稳健的有限元实现方法。该实现方法与自由溶胀的分析解决方案进行了验证，并证明了对于仅由无溶剂的溶剂溶胀的中性凝胶，可以适当还原为先前的化学机械理论。然后将该理论和实现方法应用于模拟我们最近开发的实验水凝胶系统（Cangialosi 等人，2017 年）中通过 DNA 交联剂的动态聚合实现的可调大溶胀。针对非高斯机械自由能中锁定拉伸 λL 的反应驱动演化建立了一个新的构成模型，在该模型中，DNA 交联剂浓度的增加使进一步溶胀在能量上变得有利。只需一个自由参数，就能发现测量值与预测值之间的平衡溶胀率非常一致。这项研究证明了将电化学机械框架扩展到包括化学反应和成分感知构成模型的能力，并表明开发反应模型可以模拟以前未处理过的复杂动态聚合现象。这里的理论框架还可以进一步扩展，纳入更多的非理想和非线性现象。Prediction of yield surface of single crystal copper from discrete dislocation dynamics and geometric learningWu-Rong Jian, Mian Xiao, WaiChing Sun, Wei Caidoi:10.1016/j.jmps.2024.105577从离散位错动力学和几何学习预测单晶铜的屈服面The yield surface of a material is a criterion at which macroscopic plastic deformation begins. For crystalline solids, plastic deformation occurs through the motion of dislocations, which can be captured by discrete dislocation dynamics (DDD) simulations. In this paper, we predict the yield surfaces and strain-hardening behaviors using DDD simulations and a geometric manifold learning approach. The yield surfaces in the three-dimensional space of plane stress are constructed for single-crystal copper subjected to uniaxial loading along the [100] and [110] directions, respectively. With increasing plastic deformation under [100] loading, the yield surface expands nearly uniformly in all directions, corresponding to isotropic hardening. In contrast, under [110] loading, latent hardening is observed, where the yield surface remains nearly unchanged in the orientations in the vicinity of the loading direction itself but expands in other directions, resulting in an asymmetric shape. This difference in hardening behaviors is attributed to the different dislocation multiplication behaviors on various slip systems under the two loading conditions.材料的屈服面是宏观塑性变形开始的标准。对于晶体固体，塑性变形是通过位错运动发生的，而位错运动可以通过离散位错动力学（DDD）模拟捕捉到。本文利用 DDD 模拟和几何流形学习方法预测屈服面和应变硬化行为。我们为分别沿 [100] 和 [110] 方向承受单轴载荷的单晶铜构建了平面应力三维空间中的屈服面。在[100]方向加载时，随着塑性变形的增加，屈服面几乎在所有方向上均匀扩展，相当于各向同性硬化。相反，在[110]加载条件下，则出现了潜伏硬化，屈服面在加载方向附近的方向上几乎保持不变，但在其他方向上却扩大了，从而形成了不对称的形状。硬化行为的这种差异归因于两种加载条件下不同滑移系统上不同的位错倍增行为。Mechanics of MaterialsMechanical properties and deformation mechanisms of single crystal Mg micropillars subjected to high-strain-rate C-axis compressionZ. Lin, D.J. Magagnosc, J. Wen, X. Hu, H.D. Espinosadoi:10.1016/j.mechmat.2024.104951单晶镁微柱在高应变速率 C 轴压缩条件下的力学性能和变形机制The mechanical properties and deformation mechanisms of single crystal magnesium under c-axis quasi-static and high-strain rate compressions are investigated through in situ scanning electron microscope (SEM) experiments and post-mortem transmission electron microscope (TEM) characterization. The findings revealed that ductility and high rates of hardening are preserved for pillars as large as 15 μm. Furthermore, rate effects result in a mild increase in flow stress with plastic deformations controlled primarily by the slip of <a+c> type dislocations. Importantly and in contrast to other literature reports, plastic deformation occurs in the absence of twining. As the strain increases and plastic deformation exceeds about 4%, crystal rotation activates basal slip, type dislocations, resulting in a more rate independent flow stress. TEM observation on micropillars compressed at a strain rate of 250/s, revealed the activation of {11 2¯2¯} <1¯1¯23> slip systems and high mobility of screw dislocations as major contributors to plastic strains in excess of 10% without fracture. These findings are relevant to the design of lightweight materials used in transportation systems, e.g., selection of material grain size. Moreover, the experimental data here reported provides the materials science community with a unique opportunity to validate discrete dislocation dynamics (DDD) formulations employed in multiscale design of materials.通过原位扫描电子显微镜（SEM）实验和死后透射电子显微镜（TEM）表征，研究了单晶镁在 c 轴准静态和高应变率压缩条件下的机械性能和变形机制。研究结果表明，大至 15 μm 的柱体仍保持了延展性和高硬化率。此外，速率效应导致流动应力轻度增加，塑性变形主要由 <a+c> 型位错滑移控制。重要的是，与其他文献报道不同，塑性变形是在没有缠绕的情况下发生的。随着应变的增加和塑性变形超过约 4%，晶体旋转激活了基底滑移和型位错，从而产生了与速率更不相关的流动应力。对以 250/s 应变速率压缩的微柱体进行的 TEM 观察显示，基底滑移和型位错的激活与应变速率无关。{11 2¯2¯} <1¯1¯23> 滑移系统和螺钉位错的高流动性是导致塑性应变超过 10%而不断裂的主要原因。这些发现与运输系统中使用的轻质材料的设计有关，例如材料晶粒大小的选择。此外，本文报告的实验数据为材料科学界提供了一个独特的机会，以验证多尺度材料设计中采用的离散位错动力学（DDD）公式。International Journal of PlasticityModelling and simulation of dynamic compression of Bulk Metallic Glasses at room and elevated temperatures using split Hopkinson pressure bar setupArun Kamble, Parag Tandaiyadoi:10.1016/j.ijplas.2024.103915使用分体式霍普金森压力棒装置对散装金属玻璃在室温和高温下的动态压缩进行建模和模拟This paper presents a modelling and simulation study of dynamic compression behaviour of Bulk Metallic Glasses (BMGs) at room and elevated temperatures using the split Hopkinson pressure bar (SHPB) setup. The primary objective of this study is to develop and validate a constitutive model and simulation methodology capable of predicting the high strain rate response of BMGs at different temperatures. We propose a constitutive model for BMGs that accounts for the effects of high strain rates and elevated temperatures. We numerically implemented this model in ABAQUS/Explicit Finite Element Analysis software by writing a Vectorized User Material (VUMAT) subroutine. The methodology for modelling and simulation of dynamic compression of BMG specimens using the SHPB setup is developed. The present simulations are able to correctly predict the rate-independent response of Zr41.2Ti13.8Cu12.5 Ni10Be22.5 (Vitreloy-1) BMG under dynamic compression at room and elevated temperatures. Furthermore, the present simulations are also able to correctly predict the negative strain rate sensitivity (SRS) of Zr52.5Cu17.9Ni14.6Al10Ti5 (Vitreloy-105) BMG at room temperature. Finally, the present simulations correctly predict that the failure stress of Zr64.13Cu15.75Ni10.12Al10 BMG decreases with increasing temperature and exhibits a minimal positive SRS. The present study is the first successful attempt to model the mechanical response of various BMGs under dynamic compression and at room and elevated temperatures. In particular, the experimentally observed negative SRS in some BMGs has been successfully simulated. The present work has important implications for the design of next generation spacecraft shields that are based on BMGs for mitigating the effects of hypervelocity impacts from debris in space.本文介绍了利用分体式霍普金森压力棒（SHPB）装置对块状金属玻璃（BMG）在室温和高温下的动态压缩行为进行建模和模拟研究的情况。本研究的主要目的是开发和验证能够预测不同温度下 BMG 高应变率响应的构成模型和模拟方法。我们提出了一种考虑到高应变率和高温影响的 BMG 构成模型。通过编写矢量化用户材料 (VUMAT) 子程序，我们在 ABAQUS/显式有限元分析软件中对该模型进行了数值化实现。我们开发了使用 SHPB 设置对 BMG 试样进行动态压缩建模和模拟的方法。本模拟能够正确预测 Zr41.2Ti13.8Cu12.5 Ni10Be22.5 (Vitreloy-1) BMG 在室温和高温动态压缩下与速率无关的响应。此外，本模拟还能正确预测室温下 Zr52.5Cu17.9Ni14.6Al10Ti5（Vitreloy-105）BMG 的负应变速率敏感性（SRS）。最后，本模拟结果正确预测了 Zr64.13Cu15.75Ni10.12Al10 BMG 的破坏应力随温度升高而减小，并表现出最小的正 SRS。本研究首次成功模拟了各种 BMG 在动态压缩、室温和高温条件下的机械响应。特别是成功模拟了实验观察到的某些 BMG 的负 SRS。本研究成果对于设计基于 BMG 的下一代航天器防护罩以减轻空间碎片的超高速撞击影响具有重要意义。Thin-Walled StructuresThe phase-field fracture model enriched by interpolation cover functions for brittle fracture problemsJiye Wang, Liming Zhou, Zhiqiang Gao, Peng Liudoi:10.1016/j.tws.2024.111724针对脆性断裂问题的插值覆盖函数丰富的相场断裂模型In this study, interpolation cover functions were introduced into the phase-field fracture model (PFM) to improve its convergence and efficiency. The traditional PFM has proven to be successful in simulating brittle fracture problems. However, one disadvantage is that it requires a relatively dense mesh. The PFM model enriched by interpolation cover functions (EPFM) was used for numerical fracture analysis under a relatively coarse mesh. The rank deficiency problem caused by the introduction of interpolation cover functions was resolved using the rank deficiency repair technique. Higher gradients were captured by introducing interpolation cover functions without changing the mesh structure. The numerical examples showed the improvement in convergence. The high efficiency of the proposed EPFM was demonstrated through a series of numerical examples. The numerical results of the EPFM and PFM under different length-scale parameters and meshes were also compared. The results showed that the proposed EPFM is an excellent alternative for evaluating engineering fracture problems.本研究在相场断裂模型（PFM）中引入了插值覆盖函数，以提高其收敛性和效率。事实证明，传统的相场断裂模型在模拟脆性断裂问题上是成功的。但其缺点是需要相对密集的网格。通过插值覆盖函数（EPFM）丰富的 PFM 模型被用于在相对较粗的网格下进行断裂数值分析。使用秩缺陷修复技术解决了因引入插值覆盖函数而导致的秩缺陷问题。通过引入插值覆盖函数，在不改变网格结构的情况下捕捉到了更高的梯度。数值实例表明收敛性得到了改善。通过一系列数值示例，证明了所提出的 EPFM 的高效性。此外，还比较了 EPFM 和 PFM 在不同长度尺度参数和网格下的数值结果。结果表明，所提出的 EPFM 是评估工程断裂问题的最佳选择。来源：复合材料力学仿真Composites FEM

【新文速递】2024年2月15日复合材料SCI期刊最新文章

Composite Structures

Composites Part A: Applied Science and Manufacturing

Composites Part B: Engineering

Composites Science and Technology

【新文速递】2024年2月19日固体力学SCI期刊最新文章