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    • 8. 发明申请
    • Numerical Simulation Of Crack Propagation Due To Metal Fatigue
    • 金属疲劳裂纹扩展的数值模拟
    • US20160034621A1
    • 2016-02-04
    • US14450643
    • 2014-08-04
    • Livermore Software Technology Corporation
    • Yun Huang
    • G06F17/50
    • G06F17/5018G06F2217/76
    • FEA model representing a metal object subjected to expected random vibration loadings during a predefined time period is received. Structural dynamic characteristics and responses of the FEA model are obtained. Cumulative damage ratios of all finite elements are computed using the obtained structural dynamic responses along with a S-N curve for the metal object, and predefined time period. Time and location of fatigue failure in the FEA model are determined by identifying which one of the finite elements fails first. The identified failed finite element's cumulative damage ratio reaches unity first. The FEA model is revised by removing the identified failed finite element. Then the revised FEA model is used for repeating the process of identifying another fatigue failure until the determined time of fatigue failure has passed the predefined time period. All identified failed finite elements represent simulated fatigue crack propagation.
    • 接收表示在预定时间段内经受预期的随机振动加载的金属物体的FEA模型。 获得了FEA模型的结构动力特性和响应。 使用获得的结构动态响应以及金属物体的S-N曲线和预定时间段来计算所有有限元的累积损伤比。 FEA模型中疲劳失效的时间和位置通过确定哪一个有限元首先失效来确定。 确定的故障有限元累积损伤率首先达到统一。 通过删除确定的故障有限元修改FEA模型。 然后,经修订的FEA模型用于重复确定另一个疲劳故障的过程,直到确定的疲劳失效时间已经过了预定义的时间段。 所有确定的故障有限元表示模拟疲劳裂纹扩展。