【新文速递】2023年10月25日固体力学SCI期刊最新文章

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今日更新：Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 1 篇

Mechanics of Materials

Embedding strain-rate sensitivities of multiple deformation mechanisms to predict the behavior of a precipitate-hardened WE43 alloy under a wide range of strain rates

Weiss Jacob, Su Yanqing, McWilliams Brandon A., Beyerlein Irene J., Knezevic Marko

doi:10.1016/j.mechmat.2023.104843

嵌入多种变形机制的应变速率敏感性，预测沉淀硬化的 WE43 合金在各种应变速率下的行为

A rare earth Mg alloy, WE43, exhibits high strength, good ductility, low anisotropy, and moderately high strain rate sensitivity. As such, the alloy is a viable candidate for high strain rate applications. In this work, a comprehensive set of mechanical and microstructure data recorded during quasi-static, high strain rate split Hopkinson bar (SHB), and impact tests on specimens of WE43 Mg alloy reported in (Savage et al., 2020b) is simulated and interpreted using an advanced Taylor-type crystal plasticity finite element (T-CPFE) model. The T-CPFE model is formulated physically to embed two sources of strain-rate sensitivities inherent to each slip and twinning mode in WE43, one that occurs under constant structure and another that affects structure evolution. The model parameters are established for the alloy by achieving agreement in the stress-strain response and microstructure evolution under quasi-static and SHB tests. Density functional theory calculations of anti-phase boundary (APB) energy are carried out to explain origins of the unusually large initial slip resistance for basal dislocations, which shear precipitates in the alloy. The initial slip resistances of the prismatic and pyramidal dislocations are, instead, rationalized by Orowan looping around precipitates. After calibration and validation, the model is shown to successfully predict WE43 response at much larger strain rates than those used for model calibration. Specifically, mechanical response, specimen geometry changes, twin volume fractions, and texture evolution are predicted for different orientations of the Taylor cylinders. Details of the modeling framework, comparison between simulation and experimental results, and insights from the results are presented and discussed.

稀土镁合金 WE43 具有高强度、良好的延展性、低各向异性和适度的高应变速率敏感性。因此，该合金是高应变速率应用的可行候选材料。在这项工作中，使用先进的泰勒型晶体塑性有限元（T-CPFE）模型模拟和解释了（Savage 等人，2020b）中报道的 WE43 镁合金试样在准静态、高应变率分裂霍普金森棒（SHB）和冲击试验中记录的一整套机械和微观结构数据。T-CPFE 模型通过物理方法制定，嵌入了 WE43 中每种滑移和孪晶模式固有的应变速率敏感性的两个来源，一个是在恒定结构下发生的，另一个是影响结构演变的。通过在准静态和 SHB 试验下应力-应变响应和微观结构演变的一致性，为合金建立了模型参数。对反相边界（APB）能量进行了密度泛函理论计算，以解释合金中剪切析出的基底位错的初始滑移阻力异常大的原因。棱柱位错和金字塔位错的初始滑移阻力则是通过析出物周围的奥罗万循环而得到合理解释的。经过校准和验证，该模型可以成功预测 WE43 在比用于模型校准的应变速率大得多的应变速率下的响应。具体来说，预测了泰勒圆柱体不同方向的机械响应、试样几何形状变化、孪晶体积分数和纹理演变。本文介绍并讨论了建模框架的细节、模拟与实验结果的比较以及从结果中获得的启示。

International Journal of Plasticity

Two-dimensional evolution of temperature and deformation fields during dynamic shear banding: In-situ experiments and modeling

Zeng Qinglei, Chen Manxi, Yu Xiaoqi, Qi Wei, Zhu Shengxin, Yang Heng, Chen Hao-Sen

doi:10.1016/j.ijplas.2023.103782

动态剪切成带过程中温度场和变形场的二维演变：现场实验与建模

Adiabatic shear band (ASB) is a significant failure mechanism observed in metals and alloys under impact loading. Though ASB formation has been widely assumed to be a one-dimensional thermo-mechanically-coupled instability problem, it is crucial to recognize that adiabatic shear banding is essentially a two-dimensional propagating event in space. However, it is challenging to perform in-situ characterization of temperature-deformation fields during ASB formation due to the extremely small spatial and temporal scales involved. To obtain the two-dimensional features of ASB evolution, a newly developed plane-array infrared imaging system and microspeckle-based digital image correlation (DIC) technique are synchronized with the Kolsky bar system. By incorporating interrupted tests, “quasi-synchronous” characterization of temperature-deformation-microstructure evolution during ASB formation in hat-shaped specimens of Ti-6Al-4V is achieved. A phase-field model incorporating energy-based shear banding criteria and independently calibrated model parameters is established to simulate the dynamic shear failure process, which is demonstrated to be able to well reproduce experimentally observed temperature and deformation evolution. Based on experimental characterization and simulation results, the two-dimensional features and thermo-mechanical aspects of ASB formation are presented. Energy dissipation of shear banding is estimated based on the measured temperature field, demonstrating good agreement with the calibrated values in the phase-field model. The “propagation” and “percolation” modes along the band are analyzed, which can be predicted by the introduction of a shear band process zone. The influences of thermal and microstructural softening on shear failure are also clarified through a comprehensive analysis of temperature and microstructure evolution.

绝热剪切带（ASB）是金属和合金在冲击载荷作用下出现的一种重要失效机制。尽管人们普遍认为 ASB 的形成是一个一维热机械耦合不稳定问题，但必须认识到绝热剪切带基本上是一个二维空间传播事件。然而，由于涉及的空间和时间尺度极小，在 ASB 形成过程中对温度-形变场进行现场表征具有挑战性。为了获得 ASB 演化的二维特征，新开发的平面阵列红外成像系统和基于微斑的数字图像相关（DIC）技术与 Kolsky bar 系统同步进行。通过结合间断试验，实现了对 Ti-6Al-4V 帽形试样 ASB 形成过程中温度-变形-微结构演变的 "准同步 "表征。建立了一个相场模型，其中包含基于能量的剪切带标准和独立校准的模型参数，用于模拟动态剪切破坏过程，该模型能够很好地再现实验观察到的温度和变形演变。基于实验表征和模拟结果，介绍了 ASB 形成的二维特征和热力学方面。根据测量的温度场估算了剪切带的能量耗散，结果表明与相场模型中的校准值十分吻合。分析了沿带的 "传播 "和 "渗流 "模式，这些模式可以通过引入剪切带过程区来预测。此外，还通过对温度和微结构演变的全面分析，阐明了热软化和微结构软化对剪切破坏的影响。

Thin-Walled Structures

Fiber orientation and boundary stiffness optimization of laminated cylindrical shells with elastic boundary for maximum the fundamental frequency by an improved sparrow search algorithm

Chen Yugeng, Wang Qingshan, Zhong Rui, Shi Xianjie, Qin Bin

doi:10.1016/j.tws.2023.111299

用改进的麻雀搜索算法优化具有弹性边界的层叠圆柱壳的纤维方向和边界刚度，以获得最大基频

In this paper, a multivariate improved sparrow search algorithm (MCSSA) is proposed for maximizing the fundamental frequency of composite laminated cylindrical shells and preventing vibrational resonance. The mathematical model for analyzing the fundamental frequency of composite laminated cylindrical shells in free vibration is established based on the first-order shear deformation theory (FSDT). A fundamental frequency optimization model for composite laminated cylindrical shells with elastic boundary is formulated, considering the influence of fiber orientation and boundary stiffness, with the objective of maximizing the fundamental frequency. In the optimization process, in response to the shortcomings of the sparrow search algorithm, Piecewise Linear Chaotic Map (PWLCM), tracking learning strategy, opposition-based learning strategy (OBL) and elite retention strategy are introduced for improvement to obtain the MCSSA with better overall performance for model optimization. The effectiveness and applicability of the algorithm improvements are demonstrated by comparing MCSSA with the whale optimization algorithm (WOA), sparrow search algorithm (SSA), and pelican optimization algorithm (POA) using 13 standard test functions and 2 composite laminated cylindrical shell cases. The numerical calculation results show that the shells optimized with MCSSA have higher fundamental frequency. MCSSA is an effective candidate for solving such problems.

本文提出了一种多变量改进麻雀搜索算法（MCSSA），用于最大化复合材料层压圆柱壳的基频并防止振动共振。基于一阶剪切变形理论（FSDT），建立了分析自由振动中复合材料层压圆柱壳基频的数学模型。考虑到纤维取向和边界刚度的影响，建立了具有弹性边界的复合材料层压圆柱壳的基频优化模型，目标是使基频最大化。在优化过程中，针对麻雀搜索算法的缺点，引入了片断线性混沌图（PWLCM）、跟踪学习策略、基于对立面的学习策略（OBL）和精英保留策略进行改进，得到了整体性能更好的 MCSSA，用于模型优化。通过使用 13 个标准测试函数和 2 个复合层压圆柱壳案例，比较 MCSSA 与鲸鱼优化算法（WOA）、麻雀搜索算法（SSA）和鹈鹕优化算法（POA），证明了算法改进的有效性和适用性。数值计算结果表明，采用 MCSSA 算法优化的壳体具有更高的基频。MCSSA 是解决此类问题的有效候选算法。

来源：复合材料力学仿真Composites FEM

【新文速递】2023年10月29日复合材料SCI期刊最新文章

今日更新：Composite Structures 2 篇，Composites Part A: Applied Science and Manufacturing 1 篇，Composites Science and Technology 2 篇Composite StructuresA unified phase-field method-based framework for modeling quasi-brittle fracture in composites with interfacial debondingBian Pei-Liang, Qing Hai, Schmauder Siegfried, Yu Tiantangdoi:10.1016/j.compstruct.2023.117647基于统一相场法的界面脱粘复合材料准脆性断裂建模框架Interfacial debonding affects the mechanical behaviors of composite structures. In the present work, we developed a new phase-field-based cohesive zone model for modeling debonding at interfaces. The traction-separation law and evolution of phase-field considering the mixed-mode scheme of fracture toughness are given in a variational form. Besides, the present interfacial model can work with the phase-field cohesive zone model for the bulk region, in which a common phase-field value ϕ is shared for both regions. The interaction between the bulk region and interfacial cracking in both displacement, as well as phase-field, are taken into account directly to avoid the over-estimation of the free surface energy. The framework is implemented with the finite element method and validated with several numerical examples. The present work provides a unified approach for modeling quasi-brittle fracture in the bulk region and interfaces and shows its advantage in describing interactions between bulk and interfacial cracking.界面脱粘影响复合材料结构的力学行为。在本研究中，我们开发了一种新的基于相场的内聚区模型，用于模拟界面脱粘。考虑到断裂韧性的混合模式方案，以变异形式给出了牵引分离定律和相场演化。此外，本界面模型可与块体区域的相场内聚区模型协同工作，其中共同的相场值为 ϕ 两个区域共享。为了避免过高估计自由表面能，直接考虑了体积区域和界面裂缝在位移和相场中的相互作用。该框架采用有限元法实现，并通过几个数值实例进行了验证。本研究为体层和界面的准脆性断裂建模提供了一种统一的方法，并显示了其在描述体层和界面裂纹之间相互作用方面的优势。Effect of linear heat input on the interface and mechanical properties of steel/CFRP laser welding jointHe Zhaoguo, Zhou Dianwu, Zhou Shiwei, Du Xinyu, Liu Ao, Wang Xinyu, Liu Jinshuidoi:10.1016/j.compstruct.2023.117652线性热输入对钢/CFRP 激光焊接接头界面和机械性能的影响An investigation on laser joining of PA66 carbon fiber reinforced plastic (CFRP) to DP780 dual-phase steel was presented. Effect of linear heat input on the interface and mechanical properties of steel/CFRP joint was performed. When linear heat input increases, the softening phenomenon is not observed in heat-affected region of dual-phase steel. Meanwhile, the melting point and decomposition temperature of resin are less impacted. The maximum tensile-shear force of steel/CFRP joint reaches 1959.4N. The interface temperature is contained between melting and decomposition temperature of resin, the spreading of resin on steel surface is promoted, and a favorable steel/CFRP bonding interface is obtained. In addition, the new chemical bonds such as M-C and M-O are formed, which is conducive to the chemical connection of steel/CFRP interface. However, as excessive linear heat input is applied, the interface temperature will exceed the decomposition temperature of resin, resulting the generation of decomposing pores. Moreover, due to excessive heat on resin, its crystallinity decreases, the interface between resin and fiber is weakened, so that the fracture behaves as a mixed fracture mode of interface and cohesion fractures, which deteriorates steel/CFRP joint properties.本研究对 PA66 碳纤维增强塑料 (CFRP) 与 DP780 双相钢的激光连接进行了研究。研究了线性热输入对钢/CFRP 接头界面和机械性能的影响。当线性热输入增加时，在双相钢的热影响区域未观察到软化现象。同时，树脂的熔点和分解温度受到的影响较小。钢/CFRP 接头的最大拉伸剪切力达到 1959.4N。界面温度控制在树脂的熔点和分解温度之间，促进了树脂在钢表面的铺展，获得了良好的钢/CFRP 粘合界面。此外，还形成了 M-C 和 M-O 等新的化学键，有利于钢/CFRP 界面的化学连接。但是，由于输入的线性热量过高，界面温度会超过树脂的分解温度，从而产生分解气孔。此外，由于树脂受热过度，其结晶度降低，树脂和纤维之间的界面被削弱，从而使断裂表现为界面断裂和内聚断裂的混合断裂模式，从而使钢/CFRP 接头的性能恶化。Composites Part A: Applied Science and ManufacturingProgressive pseudograin damage accumulation model for short fiber-reinforced plastics and its application to fatigue life predictionYang Jewook, Choi Jae-Hyuk, Jang Jinhyeok, Pang Hyonwoo, Cho Jeong-Min, Yu Woong-Ryeoldoi:10.1016/j.compositesa.2023.107871短纤维增强塑料的渐进伪晶粒损伤累积模型及其在疲劳寿命预测中的应用A progressive pseudograin damage accumulation (PPDA) model is proposed to predict the fatigue life of short fiber-reinforced plastics (SFRPs), combining viscoelastic-viscoplastic (VEVP) two-step homogenization theory with Chaboche fatigue damage model. Each representative volume element (RVE) of SFRPs is decomposed into pseudograins using a two-step homogenization framework. Then, the fatigue life of each pseudograin is predicted using a master S-N curve, which is prepared based on the “normalized fatigue factor” taking into account both the stress ratio and multiaxial stress state. Thereafter, the overall failure of RVE is predicted by a PPDA model, in which each pseudograin fails progressively considering the stress concentration of the living pseudograins, resulting in non-linear fatigue damage evolution. Finally, the PPDA model is successfully implemented into ABAQUS user material subroutine (UMAT), predicting the fatigue lifetime in good agreement with experimental data.结合粘弹性-粘塑性（VEVP）两步均质化理论和 Chaboche 疲劳损伤模型，提出了一种渐进式伪晶粒损伤累积（PPDA）模型，用于预测短纤维增强塑料（SFRP）的疲劳寿命。利用两步均质化框架将 SFRP 的每个代表性体积元素（RVE）分解成假晶粒。然后，利用基于 "归一化疲劳因子 "的主 S-N 曲线预测每个假晶粒的疲劳寿命，该曲线同时考虑了应力比和多轴应力状态。然后，通过 PPDA 模型预测 RVE 的整体失效，在该模型中，考虑到活伪晶的应力集中，每个伪晶都会逐渐失效，从而导致非线性疲劳损伤演变。最后，PPDA 模型成功地应用于 ABAQUS 用户材料子程序（UMAT），预测出的疲劳寿命与实验数据十分吻合。Composites Science and TechnologyDielectric polyimide composites with enhanced thermal conductivity and excellent electrical insulation properties by constructing 3D oriented heat transfer networkZhao Ke, Wei Siyu, Cao Ming, Wang Meng, Li Pengfei, Li Hao, Zhang Xianglin, Zhang Yuanyuan, Chen Yingbodoi:10.1016/j.compscitech.2023.110323 通过构建三维定向传热网络提高导热性和电绝缘性能的介电聚酰亚胺复合材料With the continuous development of electronic technology, polymer-based thermal management materials (TMMs) with insulation, high thermal conductivity (TC), and low dielectric performance are urgently needed for electronic devices. Nevertheless, balancing above expected properties is still a daunting challenge because of phonon scattering and interfacial polarization. Here we put forward a simple and useful method for preparing polyimide (PI) composites. First, the alignment of modified boron nitride nanosheet (MBN) along the fiber was controlled by electrospinning, while silver nanowire (AgNW) was utilized for electrostatic spraying to overlap the AgNW with MBN. Finally, a hybrid network oriented along the horizontal direction was formed by hot-pressing. The in-plane TC of the PI composites was up to 8.38 W/mK due to the formation of thermal conduction pathways along the hybrid network. The PI composites also had a series of merits, such as electrical insulation of over 2.40 × 1014 Ω cm, low dielectric constant (3.84), low dielectric loss (<0.01) at 106 Hz, excellent thermal stability (THRI = 299.3 °C), and heat dissipation capability. These PI composites with satisfactory comprehensive properties have great application potential in electronic devices, particularly in flexible electronic devices or circuits that demand electrical insulation and high TC.随着电子技术的不断发展，电子设备迫切需要具有绝缘性、高热导率（TC）和低介电性能的聚合物热管理材料（TMMs）。然而，由于声子散射和界面极化的影响，如何平衡上述预期性能仍是一项艰巨的挑战。在此，我们提出了一种简单实用的聚酰亚胺（PI）复合材料制备方法。首先，通过电纺丝控制改性氮化硼纳米片（MBN）沿纤维排列，同时利用静电喷涂使银纳米线（AgNW）与氮化硼纳米片重叠。最后，通过热压形成了沿水平方向的混合网络。由于沿着混合网络形成了热传导路径，PI 复合材料的面内 TC 高达 8.38 W/mK。PI 复合材料还具有一系列优点，例如电绝缘性超过 2.40 × 1014 Ω cm、介电常数低（3.84）、106 Hz 时介电损耗低（<0.01）、热稳定性好（THRI = 299.3 ℃）以及散热能力强。这些具有令人满意的综合性能的 PI 复合材料在电子设备中具有巨大的应用潜力，特别是在要求电绝缘和高 TC 的柔性电子设备或电路中。Sub-zero temperature flexural and flexural fatigue behaviour of glass fabric /epoxy composite tubular anti roll barsBhanage Amol, Padmanabhan K.doi:10.1016/j.compscitech.2023.110324 玻璃纤维织物/环氧树脂复合管状防滚架的零下温度抗弯和抗弯疲劳性能Flexural and flexural fatigue reliability of glass fabric/epoxy composites used in anti-roll bars in room and sub-zero temperature regions at +25 °C, +10 °C, 0 °C, −10 °C, −20 °C, −30 °C, and −40 °C are investigated. The mean flexural strength of anti-roll bars substantially varies and improves in the sub-zero flexural property assessment (+25 °C to −40 °C). The fixed amplitude pulsating mode fatigue test was carried out at temperature points, i.e., 25 °C and −40 °C. The improvement in fatigue strength was observed 3.5 times at a sub-zero temperature of −40 °C. The fatigue durability of glass/epoxy composite anti-roll bars is observed to be longer at sub-zero temperatures due to residual stresses building up, an increase in glass transition temperature, and a lack of molecular mobility leading to higher chain stiffness in the epoxy matrix. The structural properties like flexural rigidity and modulus were calculated with reference to the shape factor and test temperatures for better correlations. These lifetime prediction studies under unpredictable operating conditions for automotive are crucial in the development of robust designs. Automotive performance under service conditions and environmental extremes will become increasingly important as lighter weight, longer life, and higher structural performance continue to evolve.研究了玻璃纤维织物/环氧树脂复合材料在室温和零度以下（+25 °C、+10 °C、0 °C、-10 °C、-20 °C、-30 °C和-40 °C）条件下用于防滚架的挠曲和挠曲疲劳可靠性。在零下抗弯性能评估（+25 °C至-40 °C）中，抗轧钢筋的平均抗弯强度有很大变化和提高。在 25 °C 和 -40 °C 温度点进行了固定振幅脉动模式疲劳试验。在零下 40 °C 的温度下，疲劳强度提高了 3.5 倍。据观察，玻璃/环氧树脂复合材料防滚架在零下温度下的疲劳耐久性更长，这是由于残余应力的积累、玻璃转化温度的升高以及分子流动性的缺乏导致环氧树脂基体中链刚度的提高。挠曲刚度和模量等结构特性的计算参考了形状系数和测试温度，以获得更好的相关性。这些在不可预测的汽车工作条件下进行的寿命预测研究对于开发稳健的设计至关重要。随着轻量化、长寿命和高结构性能的不断发展，汽车在使用条件和极端环境下的性能将变得越来越重要。来源：复合材料力学仿真Composites FEM