Crack arrest analysis under cyclic thermal shock for an inner-surface circumferential crack in a finite-length thick-walled cylinder

摘要

This paper presents a crack arrest depth analysis under cyclic thermal shock for an inner-surface circumferentialcrack in a finite-length thick-walled cylinder with rotation-restrained edges. The inside of the cylinder is cooledfrom a uniform temperature distribution. The effects of heat transfer conditions on the maximum transient SIF forthe problem were investigated with systematical evaluation methods formerly developed. Then, under anassumption of a tentative threshold stress intensity range ΔKth together with the Paris law, the crack arrest depthunder cyclic thermal stress was evaluated. The results suggested the existence of an upper limit for the normalizedcrack arrest depth, independent of the cylinder material in an engineering sense. Finally, the validity of applyingΔKmax ≤ ΔKth as a crack arrest criterion under cyclic thermal shock was confirmed by fatigue tests under mechanicalloads equivalent to those induced by cyclic thermal shock.