非線形硬化損傷材料ならびにクリープ損傷材料におけるモードIIIき裂の漸近応力場

概要

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The effects of local damage fields on the asymptotic stress field of a Mode III crack in a nonlinear-hardening material or in a creep material are discussed. Two kinds of the damage distribution 1-D=h (0) (γ/γ_o)^m represented by a power function of radius γ from the crack-tip are postulated for the damage variable D, and the damage effects are included into the power-hardening law or the Norton creep law by means of the effective stress concept of continuum damage mechanics. For a given strain hardening exponent n of the power-hardening law or of the Norton creep law, the exponent p of the resulting asymptotic stress fields σ_<ij>^■γ^p is found to be governed by the exponent m of the power-law damage distribution. It is elucidated that when the exponent of damage distribution m increases, the exponent p of the stress field increase from a singular (negative) HRR exponent p=-1/(n+1) to a nonsingular (positive) value.
一般社団法人日本機械学会の論文
1998-11-25