STEADY-STATE AND MULTIPLE CRACKING OF SHORT RANDOM FIBER COMPOSITES
STEADY-STATE AND MULTIPLE CRACKING OF SHORT RANDOM FIBER COMPOSITES
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DOI：
10.1061/(asce)0733-9399(1992)118:11(2246
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发表时间：
1992-11-01
期刊：
影响因子：
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通讯作者：
LEUNG, CKY
中科院分区：
文献类型：
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作者：
LI, VC;LEUNG, CKY
本文基于内聚裂纹力学方法，分析了由不连续柔性和随机分布纤维增强的脆性基体复合材料的伪应变硬化现象。第一裂纹强度和应变是根据纤维、基体和界面微观机械性能得出的。研究发现稳态裂纹和多重裂纹的条件取决于两个体现所有相关材料微观机械参数的无量纲参数。因此，结果非常具有普遍性，适用于各种复合材料系统。用失效机制图来表述，可以预测不连续纤维复合材料的各种单轴载荷变形行为。还研究了由于随机取向的裂纹桥接纤维的局部纤维/基体相互作用而产生的缓冲效应对复合材料性能的影响。
This paper analyzes the pseudostrain-hardening phenomenon of brittle matrix composites reinforced with discontinuous flexible and randomly distributed fibers, based on a cohesive crack-mechanics approach. The first crack strength and strain are derived in terms of fiber, matrix, and interface micromechanical properties. Conditions for steady-state cracking and multiple cracking are found to depend on two nondimensionalized parameters that embody all relevant material micromechanical parameters. The results are therefore quite general and applicable to a variety of composite-material systems. Phrased in terms of a failure-mechanism map, various uniaxial load-deformation behaviors for discontinuous fiber composites can be predicted. The influence of a snubbing effect due to local fiber/matrix interaction for randomly oriented crack-bridging fibers on the composite properties is also studied.