Numerical investigation of the fatigue crack growth under variable amplitude loading using an improved strip-yield model considering variable constraint and plastic shrinkage

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-05-17 DOI:10.1016/j.tafmec.2025.104996

Tian Xu, Saisai He, Dongfang Zeng, Liantao Lu

{"title":"Numerical investigation of the fatigue crack growth under variable amplitude loading using an improved strip-yield model considering variable constraint and plastic shrinkage","authors":"Tian Xu, Saisai He, Dongfang Zeng, Liantao Lu","doi":"10.1016/j.tafmec.2025.104996","DOIUrl":null,"url":null,"abstract":"<div><div>The object of this study was to develop a quantitative fatigue crack growth (FCG) prediction model for general crack configurations under variable amplitude (VA) loading conditions. To achieve this, an improved strip-yield model (SYM) considering variable constraint and plastic shrinkage was developed to evaluate the plasticity-induced crack closure (PICC) behavior in an infinitely wide center-cracked plate. Based on the <em>K</em>-Analogy method, this model was employed to predict the FCG life of compact tension (CT) specimens made from 16MnDR steel under various loading conditions. The results indicate that, in comparison to the original SYM, which employed a constant constraint and without considering plastic shrinkage, the improved SYM yields results that more closely with experimental findings. This emphasizes the importrance of considering variable constraint and plastic shrinkage in predicting the FCG life under VA loading.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"139 ","pages":"Article 104996"},"PeriodicalIF":5.6000,"publicationDate":"2025-05-17","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/S0167844225001545","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

The object of this study was to develop a quantitative fatigue crack growth (FCG) prediction model for general crack configurations under variable amplitude (VA) loading conditions. To achieve this, an improved strip-yield model (SYM) considering variable constraint and plastic shrinkage was developed to evaluate the plasticity-induced crack closure (PICC) behavior in an infinitely wide center-cracked plate. Based on the K-Analogy method, this model was employed to predict the FCG life of compact tension (CT) specimens made from 16MnDR steel under various loading conditions. The results indicate that, in comparison to the original SYM, which employed a constant constraint and without considering plastic shrinkage, the improved SYM yields results that more closely with experimental findings. This emphasizes the importrance of considering variable constraint and plastic shrinkage in predicting the FCG life under VA loading.

查看原文本刊更多论文

考虑变约束和塑性收缩的改进条形屈服模型在变幅载荷下疲劳裂纹扩展的数值研究

本研究的目的是建立变幅加载条件下一般裂纹形态的疲劳裂纹扩展（FCG）定量预测模型。为此，建立了一种考虑变约束和塑性收缩的改进带状屈服模型（SYM），以评估无限宽中心裂纹板的塑性致裂纹闭合（PICC）行为。基于k -类比法，利用该模型对16MnDR钢致密拉伸试件在不同加载条件下的FCG寿命进行了预测。结果表明，与不考虑塑性收缩且采用恒定约束的原SYM模型相比，改进后的SYM模型的计算结果与实验结果更接近。这强调了考虑可变约束和塑性收缩的重要性，以预测在VA载荷下的FCG寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.