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9 www.ijeas.org  Abstract-Based on the Paris and Walker theories of fatigue crack propagation in titanium alloys, a normal distribution model and a two-parameter weibull distribution model were established, and the results under different crack propagation models and different distribution characteristics were compared. The fatigue crack growth model was used to analyze the distribution characteristics of the uncertain material parameters n, m and C under the normal distribution and weibull distribution. Under the condition of crack propagation, the fitting stability of uncertain material parameters under normal distribution is better than weibull distribution with low dispersion.

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