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    • 5. 发明申请
    • METHOD AND SYSTEM FOR PROBABILISTIC FATIGUE CRACK LIFE ESTIMATION
    • 用于概率疲劳裂纹生命估计的方法和系统
    • WO2014060160A1
    • 2014-04-24
    • PCT/EP2013/069096
    • 2013-09-16
    • SIEMENS AKTIENGESELLSCHAFT
    • AMANN, ChristianGRAVETT, Phillip W.KADAU, Kai
    • G06F17/50
    • G06F17/5018G01B5/00G01B5/04G01B5/30H01L21/67H01L21/67276H01L21/67288H01L22/12
    • The present invention relates to probabilistic estimation of fatigue crack life of a component configured for being subjected cyclic stress. A plurality of representations of the component are defined from material property scatter data (90a-g) and flaw-size scatter data (90h-j)of the component, wherein each representation is defined by one possible material condition and flaw-size condition associated with the component. For each individual representation, a component location is selected (93) and a determination (96) is made whether said individual representation fails after a given number of cycles N, based on the calculation (95) of a crack growth in the selected location. The crack growth is calculated (95) on the basis of the material condition and the flaw-size condition in the selected location. Failure of the individual representation is determined (96) if the crack growth is determined to be unstable. The sum total of the number of the representations that failed after N cycles is determined (97). A probability of failure of the component after N cycles is then determined (99) as PoF(N) = Nf/S, wherein PoF(N) is the probability of failure of the component after N cycles, Nf is the sum total of the number of representations that are determined to have failed after N cycles, and S is the total number of representations.
    • 本发明涉及构造成受到循环应力的部件的疲劳裂纹寿命的概率估计。 组件的多个表示由组件的材料属性散布数据(90a-g)和缺陷尺寸散布数据(90h-j)定义,其中每个表示由相关联的一个可能的材料条件和缺陷尺寸条件 与组件。 对于每个单独的表示,基于所选择的位置中的裂纹增长的计算(95),选择分量位置(93)并且确定(96)是否在给定的循环数N之后是否失败。 基于材料条件和选定位置的缺陷尺寸条件计算裂纹扩展(95)。 如果确定裂纹增长不稳定,则确定个体表示的失败(96)。 确定N个周期后失败的表示数的总和(97)。 然后,将N个周期后的分量的故障概率确定为(99)为PoF(N)= Nf / S,其中PoF(N)是N个周期之后的分量故障的概率,Nf是 在N个周期后被确定为失败的表示的数量,S是表示的总数。