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材料工程  2015, Vol. 43 Issue (6): 79-84    DOI: 10.11868/j.issn.1001-4381.2015.06.013
  测试与表征 本期目录 | 过刊浏览 | 高级检索 |
应力比对K55套管钻井钢疲劳裂纹扩展性能的影响
许天旱1, 王荣1, 冯耀荣2, 雒设计1, 王党会1, 杨宝1
1. 西安石油大学 材料科学与工程学院, 西安 710065;
2. 中国石油集团 石油管工程技术研究院, 西安 710065
Influence of Stress Ratio on the Fatigue Crack Propagation Behavior of K55 Casing-drilling Steel
XU Tian-han1, WANG Rong1, FENG Yao-rong2, LUO She-ji1, WANG Dang-hui1, YANG Bao1
1. College of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Tubular Goods Research Centre of CNPC, Xi'an 710065, China
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摘要 利用电液伺服疲劳实验机及 SEM 研究了应力比对 K55 套管钻井钢疲劳裂纹扩展行为的影响。结果表明:应力比对裂纹失稳区起始点对应的应力强度因子范围ΔK值具有显著的影响。随着应力比的增加,裂纹扩展失稳区起始点对应的裂纹扩展速率具有显著的降低,疲劳裂纹扩展门槛值也呈现显著的降低趋势。当疲劳裂纹逐渐由Paris区过渡到失稳扩展区,平均载荷逐渐取代应力强度因子幅度ΔK作为裂纹扩展的主导驱动力。当裂纹扩展至拉伸过载区,断口表面则呈现明显的冲击断裂特征。
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许天旱
王荣
冯耀荣
雒设计
王党会
杨宝
关键词 K55套管钻井钢应力比R疲劳裂纹扩展性能应力强度因子范围ΔK断口形貌    
Abstract:The influence of stress ratio on the fatigue crack growth (FCG) behaviour of K55 casing-drilling steel was investigated by means of scanning electron microscopy (SEM) and fatigue tests. The results show that stress ratio possesses a remarkable influence on ΔK responding to starting point of crack unstable zone. The FCG rates responding to starting point of crack unstable zone exhibit a significant decrease with the increase of stress ratios, and the FCG threshold value possesses a significant decrease. The average load,which is gradually instead of ΔK, turns into the dominant drive force of the FCG when the fatigue crack propagates into the unstable zone from Paris region bit by bit. The fatigue fracture surface exhibits obviously impact facture characterization, when the crack propagates into overload tensile zone.
Key wordsK55 casing-drilling steel    stress ratio R    fatigue crack growth property    stress intensity factor range ΔK    fracture morphology
收稿日期: 2014-01-24     
1:  TG142.1+2  
  TG115.5+7  
基金资助:青年科技创新基金项目(Z12180);陕西省重点学科专项资金资助项目(YS32030203);陕西省教育厅自然科学基金(Z12201)
通讯作者: 许天旱(1971-),男,博士,副教授,主要从事材料力学性能与表征的研究,联系地址:陕西省西安市电子二路18号西安石油大学材料科学与工程学院(710065),E-mail:xutianhan@xsyu.edu.cn     E-mail: xutianhan@xsyu.edu.cn
引用本文:   
许天旱, 王荣, 冯耀荣, 雒设计, 王党会, 杨宝. 应力比对K55套管钻井钢疲劳裂纹扩展性能的影响[J]. 材料工程, 2015, 43(6): 79-84.
XU Tian-han, WANG Rong, FENG Yao-rong, LUO She-ji, WANG Dang-hui, YANG Bao. Influence of Stress Ratio on the Fatigue Crack Propagation Behavior of K55 Casing-drilling Steel. Journal of Materials Engineering, 2015, 43(6): 79-84.
链接本文:  
http://jme.biam.ac.cn/jme/CN/10.11868/j.issn.1001-4381.2015.06.013      或      http://jme.biam.ac.cn/jme/CN/Y2015/V43/I6/79
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