Miao Xinting , Liu Guoxu , Peng Jian , Tao Ping , Zhang Jinbo , Li Jian
{"title":"Study on the I-II mixed mode fatigue crack growth behavior of TC4 titanium alloy","authors":"Miao Xinting , Liu Guoxu , Peng Jian , Tao Ping , Zhang Jinbo , Li Jian","doi":"10.1016/j.tafmec.2025.104985","DOIUrl":null,"url":null,"abstract":"<div><div>This article focuses on investigating the influence of mixed mode loading and loading ratio on the fatigue crack growth (FCG) behaviors of TC4 titanium alloy. It reveals that there exists a transformation towards mode I dominant crack for mixed mode crack, while the existing mode II component at crack tip still has effects on FCG behavior, which causes a continuous change in the crack propagation path and a slower fatigue crack growth rate. During the crack propagation, the non-collinear loading has an important role on the stress intensity factor, which causes greater mode I and mode II stress intensity factors. The improved expressions of SIFs have been proposed taken the non-collinear loading into account. The effects of mixed mode loading and loading ratio on the crack tip fields were also discussed, where the SIF acting as the driving force was modified to be applicable to all the loading ratios. The FCGR curve with relationship of the equivalent SIF was proposed taking the compressive loading and mixed mode loading into consideration.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"138 ","pages":"Article 104985"},"PeriodicalIF":5.6000,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical and Applied Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167844225001430","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This article focuses on investigating the influence of mixed mode loading and loading ratio on the fatigue crack growth (FCG) behaviors of TC4 titanium alloy. It reveals that there exists a transformation towards mode I dominant crack for mixed mode crack, while the existing mode II component at crack tip still has effects on FCG behavior, which causes a continuous change in the crack propagation path and a slower fatigue crack growth rate. During the crack propagation, the non-collinear loading has an important role on the stress intensity factor, which causes greater mode I and mode II stress intensity factors. The improved expressions of SIFs have been proposed taken the non-collinear loading into account. The effects of mixed mode loading and loading ratio on the crack tip fields were also discussed, where the SIF acting as the driving force was modified to be applicable to all the loading ratios. The FCGR curve with relationship of the equivalent SIF was proposed taking the compressive loading and mixed mode loading into consideration.
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.