両側切欠きを有するオーステナイト鋼板のクリープ破断特性

概要

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The behaviors of creep rupture and main crack initiation lives at 700℃ with doubly notched thin plate specimens (1mm thick) having various notch root radii were investigated, using a commercial austenitic steel, SUS310S. It was found that specimens with concentration factor, α, ranging from 1. 3 to 3. 0 showed slight notch strengthening with the value of the rupture time ratio, RTR, of 1. 3 to 2. 0, while those with a larger than 3. 0 represented notch weakening having RTR of 0. 5 to 1. 0. These strengthening and weakening behaviors were explained by comparing the distributions of equivalent stress under steady-state creep conditions across notched sections with those of smooth ones. Furthermore, a relationship between the main crack initiation life, t_i, defined as when a crack length reaches 100 μm, and the mean notch opening displacement rate, V_m, that is, t_iV^n_m=C (n and C are constants), was obtained, regardless of notch root radius, which was analogous to the Monkman - Grant relationship.
社団法人日本機械学会の論文
1993-02-25