{"title":"Crack Tip Deformation during Dwell Fatigue and Its Correlation with Crack/Fracture Surface Morphologies in a Bi-Modal Ti–6Al–4V Alloy","authors":"Yuma Aoki, M. Koyama, Masaki Tanaka, K. Tsuzaki","doi":"10.2320/matertrans.mt-m2022076","DOIUrl":null,"url":null,"abstract":"We investigated how dwell fatigue loading accelerates the crack propagation in bi-modal Ti 6Al 4Valloy. A fatigue test was programmed to include displacement holding for only one cycle at several ¦ K . We found (1) crack tip strain evolved during the displacement holding, (2) the displacement holding increased fatigue striation spacing, and (3) the strain increment during the displacement holding was linearly correlated with spacing of the displacement-holding-extended striations. These facts indicate that the dwell loading assisted crack opening, which accelerated the crack propagation. Other analyses results and discussion are also presented, in terms of crack propagation mode, crack closure, and dislocation structure. [doi:10.2320 / matertrans.MT-M2022076]","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"1 1","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Transactions","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.2320/matertrans.mt-m2022076","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
We investigated how dwell fatigue loading accelerates the crack propagation in bi-modal Ti 6Al 4Valloy. A fatigue test was programmed to include displacement holding for only one cycle at several ¦ K . We found (1) crack tip strain evolved during the displacement holding, (2) the displacement holding increased fatigue striation spacing, and (3) the strain increment during the displacement holding was linearly correlated with spacing of the displacement-holding-extended striations. These facts indicate that the dwell loading assisted crack opening, which accelerated the crack propagation. Other analyses results and discussion are also presented, in terms of crack propagation mode, crack closure, and dislocation structure. [doi:10.2320 / matertrans.MT-M2022076]
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