应力比对K55套管钻井钢疲劳裂纹扩展性能的影响
Influence of Stress Ratio on the Fatigue Crack Propagation Behavior of K55 Casing-drilling Steel
查看参考文献17篇
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文摘
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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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其他语种文摘
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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. |
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来源
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材料工程
,2015,43(6):79-84 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2015.06.013
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关键词
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K55套管钻井钢
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应力比R
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疲劳裂纹扩展性能
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应力强度因子范围ΔK
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断口形貌
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地址
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1.
西安石油大学材料科学与工程学院, 西安, 710065
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中国石油集团石油管工程技术研究院, 西安, 710065
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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青年科技创新基金项目
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陕西省重点学科建设项目
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陕西省教育厅自然科学基金
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文献收藏号
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CSCD:5450092
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