Effect of ultrasonic rolling on crack growth behavior of TC4 titanium alloy laser weld under overload condition

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-03-07 DOI:10.1016/j.tafmec.2025.104910

Gao Jiayuan , Cong Jiahui , Zhou Song , Zhang Zhichao , Gao Shoulong , Liu Zhuo

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引用次数: 0

Abstract

In this study, the effect of ultrasonic rolling on the crack propagation behavior of TC4 titanium alloy laser weld under overload conditions was investigated through experiments and finite element simulation. The research content included the analysis of the cross-sectional microstructure, residual stress, microhardness, fatigue properties and fatigue fracture of the specimens before and after ultrasonic rolling strengthening. The results show that ultrasonic rolling forms a highly dislocated plastic deformation layer on the surface of the specimen, which alleviates the instantaneous damage caused by overload and introduces cold work hardening at the overload line. In terms of fatigue life, the life of the Original-OL specimen is 10.75% longer than that of the Original specimen, while the life of the USRP-OL specimen is 55.86% longer than that of the USRP specimen. Finite element analysis shows that after overloading, an overload residual compressive stress cloud will form at the crack tip, which will reduce the stress intensity factor during crack propagation. As the overload rate increases, the minimum stress intensity factor decreases and the overload inhibition area expands. And the stress intensity factor caused by overload residual stress is much higher than the stress intensity factor of ultrasonic rolling residual stress. The study proposed a strengthening mechanism combining ultrasonic rolling strengthening with overload conditions, indicating that surface strengthening and overload changed the residual stress distribution at the crack tip, enhanced the overload delay effect, and improved the fatigue life of the specimen.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.