総体的構造不連続場における環状切欠部の応力緩和評価法

概要

論文の詳細を見る
Creep damage is evaluated considering stress relaxations during steady operations in the design standard developed for the construction of a prototype FBR "Mouju" in Japan, but the creep damage evaluated at structural discontinuity portions is considerably conservative because of limited knowledge about the local stress-strain behaviors in the gross structural discontinuities during stress relaxations. Inelastic analyses of a round bar with a U groove and a stepped one were performed assuming power law materials whose exponent n was assumed to be 5. As a result, the local stress-strain behavior without the gross structural discontinuity is found to be estimated by using an elastic follow-up parameter q_F-K^<(n-1)/(n+1)>, where K is an elastic stress concentration factor and n is an exponent of the power law. The overlap effect of the gross discontinuity is found to be expressed as q_<eff>= q_n×K^<(n-1)/(n+1)>, where q_n is an elastic follow-up parameter for the gross structural discontinuity.
一般社団法人日本機械学会の論文
1992-02-25