Fiber packing and elastic properties of a transversely random unidirectional glass/epoxy composite

被引:186
作者
Gusev, AA [1 ]
Hine, PJ
Ward, IM
机构
[1] ETH Zentrum, Inst Polymers, Dept Mat, CH-8092 Zurich, Switzerland
[2] Univ Leeds, IRC Polymer Sci & Technol, Leeds LS2 9JT, W Yorkshire, England
关键词
polymer-matrix composites; elastic properties; statistics; computational simulation; ultrasonics;
D O I
10.1016/S0266-3538(99)00152-9
中图分类号
TB33 [复合材料];
学科分类号
摘要
Image analysis was used to characterize the microstructure of a unidirectional glass/epoxy composite which was found to be transversely randomly packed. Starting from a measured distribution of fiber diameter, a Monte Carlo procedure was employed to generate periodic computer models with unit cells comprising of random dispersion of a hundred non-overlapping parallel fibers of different diameter. The morphology generated in this way showed excellent agreement with that of the actual composite studied. An ultrasonic velocity method was used to measure a complete set of composite elastic constants and those of the epoxy matrix. On the basis of periodic three-dimensional meshes, the composite elastic constants of the Monte Carlo models were calculated numerically. Numerical and measured elastic constants were in good agreement. It was shown numerically that the randomness of the composite microstructure had a significant influence on the transverse composite elastic constants while the effect of fiber diameter distribution was small and unimportant. The predictive potential of the Halpin-Tsai and some other models commonly employed for predicting the elastic behavior of unidirectional composites was also assessed. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:535 / 541
页数:7
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