Numerical study on creep-fatigue damage of titanium alloy pressure shell considering the effect of welding residual stresses

被引：1

作者：

Guo, Yuhao ^{[1
]}

Teng, Yun ^{[1
]}

Liu, Gang ^{[1
]}

Jiao, Tianzhen ^{[1
]}

机构：

[1] Dalian Univ Technol, State Key Lab Struct Anal, Optimizat & CAE Software Ind Equipment, Dalian 116024, Peoples R China

来源：

THIN-WALLED STRUCTURES | 2025年 / 209卷

基金：

中国国家自然科学基金;

关键词：

Creep-fatigue; Welding residual stresses; Life prediction; Pressure shell; Titanium alloy; LIFE; TI-6AL-4V; MODEL; HULL;

D O I：

10.1016/j.tws.2025.112953

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Welding residual stress poses a significant threat to the creep-fatigue strength of titanium alloy pressure shells. This paper presents a numerical approach for assessing the evolution of creep-fatigue damage in pressure shells, incorporating the effects of welding residual stress. Two conditions are considered: the application of a heat source on the internal surface and a heat source on the external surface. Based on a heat treatment process that considers the creep stress relaxation effect, welding residual stress reduction is performed on conical-column pressure shell. Numerical simulations of creep-fatigue damage evolution in conical-column pressure shell considering the welding residual stresses were conducted. The results show that the interaction between residual stresses and working stresses significantly diminishes the creep-fatigue life of conical-column pressure shell. Different welding processes lead to noticeably different evolution behaviors of creep-fatigue damage. Considering the residual stresses from external surface welding, the phenomenon of multiple source cracks occurs, with secondary cracks potentially propagating axially. Heat treatment can improve the creep-fatigue life to a certain extent. The research results can guide the design and processing of titanium alloy pressure shells used in deep-sea vehicles.

引用

页数：16

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