接合界面に沿うき裂の塑性応力拡大係数

概要

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In this paper, the plastic stress intensity factor for a crack lying on a bimaterial interface is studied by using the finite element method. In the analysis, it is assumed that both materials obey Ramberg-Osgood stress-strain formulation, and have different Young's modulus E and different strain hardening exponent n. Detailed results under plane stress condition are investigated. When both materials have different values of E, oscillatory singular stress field develops near the crack tip, and decreases with increasing the plastic zone. When n_1≠n_2, variations of stress δ_y and τ_xy, on the interface are independent of lower value n of (n_1, n_2), and are functions of higher value n of (n_i, n_2). In addition, the variations of √δ^2_y+τ^2_xy, has stress singularity form as -1/(n+1) for higher value n of (n_1, n_2). Moreover, the plastic stress intensity factor K_p for n_1≠n_2 is almost the same value of that for n_1=n_2=n with higher value n of (n_1, n_2).
一般社団法人日本機械学会の論文
2002-06-25