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在以滑移溶解理论为基础的裂纹扩展速率定量预测模型中,裂纹长度是裂纹扩展速率的重要影响参数之一,针对镍基合金裂尖裂纹长度的扩展规律,研究裂纹长度对镍基合金材料裂纹尖端膜致应力产生的应力应变场的影响,采用ABAQUS软件,在不考虑外载的情况下,分析膜致应力应变场随裂纹扩展长度的改变所导致裂尖力学特性的变化规律。结果表明,裂纹长度不同,裂尖膜致应力产生的应力应变分布不同,膜致应力是裂纹扩展驱动力中不可忽略的主要因素之一。
In the quantitative prediction model of crack propagation rate based on the theory of slip dissolution, the crack length is one of the important influence parameters of crack propagation rate. According to the propagation rule of crack tip crack length of nickel-based alloy, the effect of crack length on nickel- Crack tip film stress induced by the stress and strain field, the use of ABAQUS software, without considering the case of external load, the analysis of film stress-strain field with crack propagation length changes caused by crack tip mechanical properties of the law of change. The results show that the stress and strain distributions induced by crack tip are different due to the different crack lengths. Membrane stress is one of the main factors that can not be ignored in the driving force of crack propagation.