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低周疲劳表面裂纹演化可能具有非线性动力学特征。对 1Cr18Ni9Ti光滑试样进行了低周疲劳实验 ,在对裂纹进行分类的基础上 ,将裂纹演化划分为多裂纹相互作用和局域主裂纹控制两个阶段。从非线性动力学角度给出了短裂纹的新的定义。指出裂纹演化两个阶段对材料疲劳损伤破坏过程的贡献。
Low-cycle fatigue surface crack evolution may have nonlinear dynamic characteristics. The low cycle fatigue test of 1Cr18Ni9Ti smooth specimen was carried out. Based on the classification of cracks, the crack evolution was divided into two stages: multi-crack interaction and local main crack control. From the perspective of nonlinear dynamics, a new definition of short crack is given. The contribution of two stages of crack evolution to the fatigue damage and destruction process of materials is pointed out.