A time dependent micro-mechanical fiber composite model for inelastic zone growth in viscoelastic matrices

被引:16
作者
Beyerlein, IJ
Zhou, CH
Schadler, LS
机构
[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
[2] Rensselaer Polytech Inst, Troy, NY 12180 USA
基金
美国国家科学基金会;
关键词
fracture; polymer matrix composites; creep; micro-Raman spectroscopy; interfacial slipping; plastic matrix;
D O I
10.1016/S0020-7683(03)00021-0
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
In this work, a fiber composite model is developed to predict the time dependent stress transfer behavior due to fiber fractures, as driven by the viscoelastic behavior of the polymer matrix, and the initiation and propagation of inelastic zones. We validate this model using in situ, room temperature, micro-Raman spectroscopy fiber strain measurements. Multifiber composites were placed under constant load creep tests and the fiber strains were evaluated with time after one fiber break occurred. These composite specimens ranged in fiber volume fraction and strain level. Comparison between prediction and MRS measurements allows us to characterize key in situ material parameters, the critical matrix shear strain for inelastic zones and interfacial frictional slip shear stress. We find that the inelastic zone is predominately either shear yielding or interfacial slipping, and the type depends on the local fiber spacing. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2171 / 2194
页数:24
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