Hang Yao , Tian Bai , Xiuwen He , Qingxiang Wang , Shaohua Gu , Sheldon Q. Shi , Jie Yan , Jiqing Lu , Dong Wang , Guangping Han , Wanli Cheng
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引用次数: 0
摘要
本研究提出了一种新颖的多尺度预测策略,包括中尺度和宏观尺度损伤演变建模,以研究平织增强复合材料(PWRC)在各种外部载荷(拉伸、压缩)作用下的有效特性和渐进损伤失效行为。通过结合实验表征(扫描电子显微镜和 X 射线计算机断层扫描)和数值模拟,开发了一种能准确描述 PWRC 局部力学行为的高精度中尺度代表体积元素(RVE)。为解决多尺度特征和损伤区域复杂应力变化导致的预测结果不准确问题,采用基于应变的三维哈欣失效准则和多尺度损伤模型分别预测了中尺度增强体(竹纤维纱束)和宏观尺度复合材料的损伤起始和演化。考虑到各向同性材料的损伤演化规律,采用基于 Von Mises 准则的损伤模型来表征中尺度基体环氧树脂(EP)在外部荷载作用下的损伤起始和演化。通过渐进均质化方法,将 PWRC 的有效特性和机械行为从中观尺度转移到宏观尺度。混合模式内聚元素的双线性构成关系用于表征 PWRC 的层间破坏。最后,对 PWRC 进行了相应的力学表征(拉伸、压缩)。此外,实验结果与模拟结果高度一致,验证了新型多尺度预测策略在研究多尺度压水混凝土结构的力学响应和揭示压水混凝土结构的破坏机理方面的可靠性。
A novel multiscale prediction strategy for simulating the progressive damage behavior of plain-woven bamboo fabrics reinforced epoxy resin composites
This study proposed a novel multiscale prediction strategy, including mesoscale and macroscale damage evolution modeling, to investigate the effective properties and progressive damage failure behavior of plain-woven reinforced composites (PWRCs) under various external loads (tension, compression). A high-precision mesoscale representative volume element (RVE) that could accurately describe the local mechanical behavior of PWRCs was developed by combining experimental characterization (scanning electron microscope and X-ray computed tomography) and numerical simulation. To solve the problem of inaccurate prediction results caused by multiscale characteristics and complex stress changes in the damaged area of PWRCs, the strain-based 3D Hashin failure criterion and the multiscale damage models were used to predict the damage initiation and evolution of mesoscale reinforcement (bamboo fiber yarn bundle) and macroscale composites, respectively. Considering the damage evolution law of isotropic materials, a damage model based on the Von Mises criterion was used to characterize the damage initiation and evolution of mesoscale matrix epoxy resin (EP) under external loading. The effective properties and mechanical behavior of the PWRCs were transferred from mesoscale to macroscale through the progressive homogenization method. The bilinear constitutive relationship of the mixed-mode cohesive element was used to characterize the interlaminar failure of the PWRCs. Finally, the corresponding mechanical characterization (tension, compression) of the PWRCs was carried out. Moreover, the experimental results were highly consistent with the simulation results, verifying the reliability of the novel multiscale prediction strategy in investigating the mechanical response of the PWRCs at multiple scales and revealing the damage mechanism of the PWRCs.
期刊介绍:
Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites.
Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.