【新文速递】2023年10月25日固体力学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