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金属学报  2006 

不锈钢在扭转/拉伸复合载荷下近门槛值的疲劳裂纹扩展行为

, PP. 186-190

Keywords: 扭转/拉伸复合加载,疲劳裂纹扩展

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Abstract:

研究了带环状预裂纹的奥氏体不锈钢圆棒试样在循环扭转/拉伸复合载荷下,门槛值附近的疲劳裂纹扩展行为,分析了复合加载时不同载荷比对裂纹扩展的影响,对裂纹扩展的初始阶段进行了详细研究,用应力强度因子表征了裂纹扩展开始的门槛值.提出了椭圆方程表达的疲劳裂纹扩展开始的门槛值模型,该方程可在裂纹尖端位移准则的基础上导出.疲劳裂纹扩展停止的门槛值条件也可用椭圆方程表达.

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