Abstract
The influence of fiber arrangement on the local plastic strain fields and the resulting mechanical response of continuous fiber reinforced metal-matrix composites under transverse loading has been studied systematically by means of finite element analyses. Random, hexagonal and square fiber arrangements were investigated. The composite material examined consisted of isotropic linear-elastic fibers which are perfectly bonded with an isotropic elastic–plastic matrix with power-law hardening behavior. The random arrangements were analyzed with representative material elements containing approximately 50 fibers. The internal strain fields are highly influenced by the fiber arrangements. Three different strengthening mechanisms are proposed for composites with perfectly plastic matrix material: the orientation, bowing-out and bending mechanisms. Simple analytical estimates are given for the orientation and the bending mechanisms. The influence of matrix work-hardening is explained by means of an effective deformable matrix volume fraction.
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