{"title":"Mechanism of Fatigue Crack Closure in Steel Under High-Density Pulsed Current","authors":"Shota Nakayama, Yutaro Sugeno, Tomoto Kambayashi, Atsushi Hosoi, Yuichi Furukawa, Takashi Tomita, Hiroyuki Kawada","doi":"10.1111/ffe.14579","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>This study is aimed at clarifying the mechanism of effectively healing fatigue cracks in steel; austenitic stainless steel, SUS304; and hot work tool steel, SKD61, using high-density pulsed current. The results show that the current concentration occurred at the crack tip for SUS304, and crack closure was observed near the fatigue crack tip. On the other hand, crack closure was observed at the notch tip in SKD61. The fatigue crack closure phenomena were verified by finite element analysis, revealing that contact pressure was applied behind the crack tip owing to local bending deformation associated with residual stress near the crack tip. For effective crack healing, it is necessary to bond the interface leveraging compressive stress and Joule heat generated at the crack tip during current application.</p>\n </div>","PeriodicalId":12298,"journal":{"name":"Fatigue & Fracture of Engineering Materials & Structures","volume":"48 4","pages":"1879-1892"},"PeriodicalIF":3.1000,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fatigue & Fracture of Engineering Materials & Structures","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/ffe.14579","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This study is aimed at clarifying the mechanism of effectively healing fatigue cracks in steel; austenitic stainless steel, SUS304; and hot work tool steel, SKD61, using high-density pulsed current. The results show that the current concentration occurred at the crack tip for SUS304, and crack closure was observed near the fatigue crack tip. On the other hand, crack closure was observed at the notch tip in SKD61. The fatigue crack closure phenomena were verified by finite element analysis, revealing that contact pressure was applied behind the crack tip owing to local bending deformation associated with residual stress near the crack tip. For effective crack healing, it is necessary to bond the interface leveraging compressive stress and Joule heat generated at the crack tip during current application.
期刊介绍：
Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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