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。
There may be non-linear dynamic characteristics during the evolution of the surface Low Cycle Fatigue(LCF)cracks system. After the LCF experiment on the smooth sample of 1Cr18Ni9Ti done ,the viewpoint that the process of fatigue cracks evolution is composed of two phases is proposed. The two phases are named as the Multi-cracks Interaction (MI)and the Local Dominant-cracks Controlling (LDC). It can be seen from the statistical investigation that the traditional short crack evolution phase is essentially the MI,and is in disorder. It is the growth and coalescence of the local dominant cracks that induce the broken of material. The two phases in the fatigue cracks evolution are essentially the result of the non-equilibrium bifur cation of the system. It is a transition from discorder to order.
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