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建立了用试验数据估计疲劳多裂纹扩展随机模型参数的方法，尤其为利用现有的单裂纹扩展试验数据，建立了用不完全数据估计多裂纹扩展参数的方法，为含多裂纹结构的概率损伤容限分析作准备．应用最小二乘原理，讨论了完全试验数据并联远源裂纹和完全试验数据近源裂纹２种情况下裂纹扩展参数的估计方法，考虑了裂纹扩展试验的２种极限情况，给出了估计结果偏于保守的不完全试验数据近源裂纹情况下的裂纹扩展参数的估计方法．完善了疲劳多裂纹扩展随机模型，为模型的工程应用打下了基础．
A method to estimate the parameters of stochastic multifractal expansion model with experimental data was established. In particular, a method to estimate the multi-crack propagation parameters with incomplete data was established by using the existing single crack propagation test data to establish the probability damage of multi- Tolerance analysis to prepare. The least squares method is used to estimate the crack propagation parameters in two cases of complete test data-parallel far-source crack and complete test data-near-source crack. Two kinds of limit conditions of crack propagation test are considered, and the estimation is given The result is conservative to the incomplete experimental data the estimation method of crack propagation parameters in the case of near-source crack. Perfect the fatigue crack growth more than random model, laid the foundation for engineering application of the model.