Micromechanical analysis of strain rate-dependent deformation and failure in composite microstructures under dynamic loading conditions
Micromechanical analysis of strain rate-dependent deformation and failure in composite microstructures under dynamic loading conditions
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DOI：
10.1016/j.ijplas.2011.10.008
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发表时间：
2012-05-01
影响因子：
9.8
通讯作者：
Ghosh, Somnath
中科院分区：
文献类型：
--
作者：
Chen, Yuli;Ghosh, Somnath
本文旨在研究微结构形态和加载特性对导致不同损伤机制、能量吸收和耗散特性的微机械应力波传播的影响。复合材料的微观结构由韧性基体中的脆性纤维以不同的排列方式表示。在Gurson-Tvergaard-Needleman模型和Johnson-Cook硬化定律的基础上，采用具有损伤演化的应变率相关弹粘塑性本构模型来模拟基质材料的行为。纤维中的损伤由各向同性连续介质损伤力学(CDM)模型模拟。微结构破坏模式和吸能耗散特性对载荷类型、体积分数和微观结构表现出较强的依赖性，而对应变率的依赖性相对较小。研究表明，对于碳化硅纤维/Al7075-T6复合材料，纤维单向排列15~20%的微结构是较好的吸能耗散设计。(C)2011爱思唯尔有限公司。保留所有权利。
This paper is intended to study the effect of microstructural morphology and loading characteristics on micromechanical stress-wave propagation leading to different damage mechanisms, energy absorption and dissipation characteristics. The composite material microstructure is represented by brittle fibers in a ductile matrix in different arrangements. The matrix material behavior is modeled using a strain-rate dependent elastic-viscoplastic constitutive model with damage evolution based on the Gurson-Tvergaard-Needleman model with a Johnson-Cook type hardening law. Damage in the fiber is modeled by an isotropic continuum damage mechanics (CDM) model. The microstructural failure modes and energy absorption and dissipation properties show strong dependence on the load types, volume fractions and microstructures, with relatively lower dependence on strain rates. The studies show that for the SiC fiber/Al7075-T6 composites, the microstructures with 15-20% unidirectional hexagonal arrangement of fibers are good designs for energy absorption and dissipation. (C) 2011 Elsevier Ltd. All rights reserved.