Creep-rupture lifetime simulation of unidirectional metal matrix composites with and without time-dependent fiber breakage

被引:14
作者
Goda, K [1 ]
机构
[1] Yamaguchi Univ, Dept Mech Engn, Ube, Yamaguchi 7558611, Japan
关键词
creep; fracture; fiber-reinforced composite material; finite elements; Monte-Carlo simulation;
D O I
10.1016/S0749-6419(01)00038-9
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A numerical simulation for predicting the axial creep-rupture lifetime of continuous fiber-reinforced metal matrix composites is proposed, based on the finite element method. The simulation model is composed of line elements representing the fibers and four-node isoparametric plane elements representing the matrix. While the fibers behave as an elastic body at all times, the matrix behaves as an elasto-plastic body at the loading process and an elasto-plastic creep body at the creep process. It is further assumed in the simulation that the fibers are fractured not only in stress criterion but time-dependently with random nature. Simulation results were compared with the creep-rupture lifetime data of a boron-aluminum composite with 10% fiber volume fraction experimentally obtained. The simulated creep-rupture lifetimes agreed well with the averages of the experimental data. The proposed simulation is further carried out to predict a possibility of creep-rupture for the composite without time-dependent fiber breakage. It is finally concluded that the-creep-rupture of a boron-aluminum composite is closely related with the shear stress relaxation occurring in the matrix as well as time-dependent fiber breakage. (C) 2001 Elsevier Science Ltd. All rights reserved.
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页码:1729 / 1748
页数:20
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