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材料工程  2015 

应力比对K55套管钻井钢疲劳裂纹扩展性能的影响

DOI: 10.11868/j.issn.1001-4381.2015.06.013, PP. 79-84

Keywords: 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

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Abstract:

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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