Effect of defect shape on rolling contact fatigue crack initiation and propagation in high strength steel.pdfVIP

下载本文档

7
0
约4.53万字
约 10页
2017-03-16 发布于天津
举报
版权申诉

Effect of defect shape on rolling contact fatigue crack initiation and propagation in high strength steel.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

Effect of defect shape on rolling contact fatigue crack initiation and propagation in high strength steel.pdf

International Journal of Fatigue 92 (2016) 507–516 Contents lists available at ScienceDirect International Journal of Fatigue journal homepage: /locate/ijfatigue Effect of defect shape on rolling contact fatigue crack initiation and propagation in high strength steel T. Makino a,?, Y. Neishi a, D. Shiozawa b, S. Kikuchi b, S. Okada b, K. Kajiwara c, Y. Nakai b a Research Development, Nippon Steel Sumitomo Metal Corporation, Japan b Department of Mechanical Engineering, Kobe University, Japan c Japan Synchrotron Radiation Research Institute (JASRI), Japan article info Article history: Received 7 December 2015 Received in revised form 4 February 2016 Accepted 5 February 2016 Available online 11 February 2016 Keywords: Rolling contact fatigue Arti?cial defect Crack propagation High strength steel Micro CT imaging abstract The objective of the present paper is to clarify the effect of shapes of circular hole defects, orientated perpendicular to the surface, on rolling contact fatigue (RCF) crack initiation and propagation in high strength steel. RCF test and synchrotron radiation micro computed tomography (SR micro CT) imaging were conducted. In the case of a 15-lm-diameter defect, the number of cycles of rolling contact to ?aking occurring (?aking life) decreased with increasing defect length. In a comparison of the CT image and the SEM view, the shapes of defects and the locations of the horizontal cracks were almost the same respectively. The mechanism of RCF crack propagation was discussed by ?nite element (FE) analysis. Defects led to higher tensile residual stress than that without defects in the region where the defect exists. The shear stress range at 0.1 mm in depth on the middle line of the defect and the range of mode II stress intensity factor at the bottom of a vertical crack increased with increasing defect length. In the case of a defect 50 lm in diameter, defect length does not affect ?aking life. The reason for this is probably that the horizontal cra