モードIき裂を有する長繊維強化複合材料における塑性領域の弾塑性有限要素法解析

概要

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An elastic-plastic stress analysis was conducted for inhomogeneous fiber-reinforced plastic (FRP)containing a mode I matrix crack by means of the finite element method.The inhomogeneous FRP was modeled as a two-dimensional laminated structure composed of elastic-perfectly plastic matrix, orthotropic elastic fiber and homogeneous FRP.The extent and the shape o the yielding zone around the crack tip for the inhomogeneous FRP were compared to those for the unreinforced matrix material.Under the same value of the matrix stress intensity factor, K_Im, the length of the plastic zone ahead of the crack tip, ω_χ/d_m, for the inhomogeneous FRP was nearly equal to that for the unreinforced matrix material in the range of K_Im≨0.7σ_Y(πd_m)^1/2, where σ_Yis the yield stress of the matrix material and d_m is the height of the matrix phase in the inhomogeneous FRP.In the range of K_Im>0.7σ_Y(πd_m)^1/2, ωχ/d_m for the inhomogeneous FRP was larger than that for the unreinforced matrix material.The plastic zone height, ω_y/d_m, is nearly identical between inhomogeneous FRP and unreinforced matrix material. A simple method is proposed to estimate the height and the length of the plastic zone in the inhomogeneous FRP from the elastic stress distrigution in the inhomogeneous FRP.
一般社団法人日本機械学会の論文
2000-01-25