Modeling and mesoscopic damage constitutive relation of brittle short-fiber-reinforced composites  

作　　者：刘洪秋 梁乃刚 夏蒙棼 

机构地区：[1]LNM, Institute of Mechanics, Chinese Academy of Sciences [2]Department of Physics, Center for Nonlinear Science, Peking University

出　　处：《Science China(Technological Sciences)》1999年第5期530-540,共11页中国科学（技术科学英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos. t9872065 and 19732060) and the Chinese Academy of Sciences.

摘　　要：Aimed at brittle composites reinforced by randomly distributed short-fibers with a relatively large aspect ratio, stiffness modulus and strength, a mesoscopic material model was proposed. Based on the statistical description,damage mechanisms, damage-induced anisotropy, damage rate effect and stress redistribution, the constitutive relation were derived. By taking glass fiber reinforced polypropylene polymers as an example, the effect of initial orientation distribution of fibers, damage-induced anisotropy, and damage-rate effect on macro-behaviors of composites were quantitatively analyzed. The theoretical predictions compared favorably with the experimental results.Aimed at brittle composites reinforced by randomly distributed short-fibers with a relatively large aspect ratio, stiffness modulus and strength, a mesoscopic material model was proposed. Based on the statistical description, damage mechanisms, damage-induced anisotropy, damage rate effect and stress redistribution, the constitutive relation were derived. By taking glass fiber reinforced polypropylene polymers as an example, the effect of initial orientation distribution of fibers, damage-induced anisotropy, and damage-rate effect on macro-behaviors of composites were quantitatively analyzed. The theoretical predictions compared favorably with the experimental results.

关 键 词：short-fiber reinforced composites MESOSCOPIC material model DAMAGE CONSTITUTIVE theory dam-age-induced anisotropy damage-rate effect. 

分 类 号：O346.1[理学—固体力学]