应力比对K55套管钻井钢疲劳裂纹扩展性能的影响
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△K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△K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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| Published in | 材料工程 Vol. 43; no. 6; pp. 79 - 84 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
西安石油大学材料科学与工程学院,西安,710065%中国石油集团石油管工程技术研究院,西安,710065
2015
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| Subjects | |
| Online Access | Get full text |
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| Summary: | 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△K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△K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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| Bibliography: | 11-1800/TB K55 casing-drilling steel; stress ratio R ; fatigue crack growth property ; stress intensity factor range △K; fracture morphology XU Tian-han,WANG Rong,FENG Yao-rong,LUO She-ji,WANG Dang-hui,YANG Bao（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） The influence of stress ratio on the fatigue crack growth （FCG） behaviour of K55 easingdrilling steel was investigated by means of scanning electron microscopy （SEM） and fatigue tests.The results show that stress ratio possesses a remarkable influence on △K 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 △K,turns into the dominant drive force of the FCG when the fatigue crack propagates into the unstable zone from Pari |
| ISSN: | 1001-4381 1001-4381 |
| DOI: | 10.11868/j.issn.1001-4381.2015.06.013 |