New Cyclic J-Integral for Low-Cycle Fatigue Crack Growth
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摘要: 探讨了低周疲劳加载条件下的应力增量-应变增量关系,提出了模拟裂纹疲劳扩展的二维模型以建立新的循环J积分参量,详细阐述了该积分参量的定义、主要特点、物理意义以及数值计算方法,并通过紧凑拉伸试样的疲劳试验检验该积分参量的有效性.结果表明:该积分参量能够较好描述恒幅低周疲劳裂纹的扩展速率.此外,基于积分参量体系,从能量的角度解释了疲劳迟滞现象.Abstract: The constitutive equation under low-cycle fatigue (LCF) was discussed, and a two-dimensional (2-D) model for simulating fatigue crack extension was put forward in order to propose a new cyclic J-integral. The definition, primary characteristics, physical interpretations and numerical evaluation of the new parameter were investigated in detail. Moreover, the new cyclic J-integral for LCF behaviors was validated by the compact tension (CT) specimens, results show that the calculated values of new parameter can correlate well with LCF crack growth rate, during constant-amplitude loading. In addition, the phenomenon of fatigue retardation was explained through the viewpoint of energy based on the concept of new parameter.
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