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A New Three-Parameter Model for Predicting Fatigue Crack Initiation Life

机译:预测疲劳裂纹萌生寿命的新三参数模型

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摘要

Based on the idea that the fatigue damage is caused by the cyclic damage strain, a concept of the critical damage quantity is introduced and a new three-parameter model is developed. The model contains three material performance parameters, i.e., the fatigue ductility coefficient, the fatigue ductility exponent, and the theoretical strain endurance limit. The fatigue ductility coefficient reflects the existence of the critical damage quantity. The fatigue ductility exponent shows the damage resistance ability of the material. And the theoretical strain endurance limit represents the existence of the critical cyclic strain. By using the proposed model, the fatigue crack initiation life of metallic materials can be predicted.
机译:基于疲劳损伤是由循环损伤应变引起的思想,引入了临界损伤量的概念,并建立了新的三参数模型。该模型包含三个材料性能参数,即疲劳延性系数,疲劳延性指数和理论应变耐久性极限。疲劳延性系数反映了临界损伤量的存在。疲劳延展性指数表明材料的抗损伤能力。并且理论应变耐久性极限表示临界循环应变的存在。通过使用所提出的模型,可以预测金属材料的疲劳裂纹萌生寿命。

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