Path prediction of I+II mixed mode fatigue crack growth in pressure vessels made from 16MnDR

In this paper, I+II mixed mode fatigue crack propagation in low alloy steel 16MnDR was experimentally investigated. Finite element method with displacement approach was employed to calculate stress intensity factors at the crack tip. It is found that under the uni-axial loading, the inclined pre-crack grows in a direction perpendicular to the applied load, making crack mode transferred from I+II mixed mode to Mode I. This behavior is irrelevant of the relative magnitude of Mode II component and the applied fatigue loading. Based on the experimental results, numerical prediction of I+II mixed mode fatigue crack growth path in a cylinder of a pressure vessel made from 16MnDR was carried out. Different incline cracks in a plate under unequal biaxial applied loadings were studied to simulate different crack orientations in the pressure vessel. Results show that for a crack at a cylinder of a pressure vessel under the action of internal pressure, the crack growth path is independent of the pressure, diameter and thickness.
Mixed mode crack Fatigue crack propagation Crack growth path Pressure vessel
Huifang Li Xiaoju Sun Caifu Qian
Beijing University of Chemical Technology, Beijing 100029, China
国际会议
2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012
济南
英文
245-250
2012-10-31(万方平台首次上网日期,不代表论文的发表时间)