疲劳短裂纹系统演化的参数域分析

Analysis on the Parameter Domains of Short Fatigue Cracks System

疲劳裂纹系统的参数域分析对于建立系统的理论模型具有一定的指导意义 .从非线性动力学角度对 Brown图进行了再分析 ,经验性地给出了疲劳裂纹系统演化的参数域 .定性分析了各区域裂纹的演化行为 ,当系统的参数满足 II区条件时 ,行为较为复杂 ,此时系统可能对材料的微结构、外界扰动具有强烈的敏感性 ,造成疲劳裂纹演化结果的分散性 .

Parameter domains analysis is significant for constructing the theoretical model of fatigue cracks system. After the reanalysis of the Brown chart from the viewpoint of nonlinear dynamics, the parameter domains of fatigue cracks system are given empirically. It′s shown that when the condition of Area Ⅱ is satisfied, the system may be violent sensitive to the material microstructure and external disturbance, so the scatter of fatigue cracks evolution results may be induced.