基于无限扩散长大机理和限制扩散长大机理的寿命预测

备注：模拟参数

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非限制扩散长大机理的预测断裂寿命均低于实验值，限制扩散长大机理的预测结果与实测值吻合得更好。

当应力较低时，两种模型对G115钢蠕变寿命的预测都存在一定的误差。

非限制扩散模型只适用于以扩散为主导的长大模式。而随着蠕变应力的不断增加，基体蠕变对孔洞长大的影响将持续提高并最终超过扩散的作用。

Life prediction based on infinite diffusion growth mechanism and restricted diffusion growth mechanism

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The predicted fracture life of the unrestricted diffusion growth mechanism is lower than the experimental value, and the predicted results of the restricted diffusion growth mechanism are in better agreement with the measured values.

When the stress is low, there are certain errors in the prediction of the creep life of G115 steel by the two models.

The unrestricted diffusion model is only applicable to the growth model dominated by diffusion. With the continuous increase of creep stress, the influence of matrix creep on the growth of pores will continue to increase and eventually exceed the effect of diffusion.