曲げ・ねじり組合せ二軸応力下のモードI 表面き裂の進展に及ぼす板厚の影響

概要

論文の詳細を見る
The effect of plate thickness on the propagation rate of a mode I surface crack under biaxial stresses by the simultaneous action of plane bending and cyclic torsion was examined, and the crack opening displacement COD was measured by magnifying a scanning electron micrograph 15000 times. The relationship between the propagation rate da/dN and the stress intensity factor rangeΔK depends on both the biaxial stress ratio C and the maximum principal stress amplitudeσ_1. COD measured under the same conditions ofσ_1 and crack length increases with the decrease in C. A unique relationship is obtained between da/dN and crack tip opening displacement CTOD, irrespective of C and σ_1. Thus, it can be concluded that the main factor which controls da/dN is CTOD.
一般社団法人日本機械学会の論文
1992-08-25