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根据已有的实验结果 ,考虑银纹损伤演变规律 ,假设裂尖银纹模型 ,导出了 I型裂纹准静态下裂纹尖端银纹增长的微分方程和稳态扩展的方程 ,研究了裂纹长度及其扩展速度随时间的演变规律 ,初步分析了银纹损伤区平均应力的变化 ,对含 I型裂纹 PMMA的寿命进行了探讨。
Based on the existing experimental results, considering the evolution rule of the silver streak damage, assuming the crack tip silver model, the differential equation and the steady-state expansion equation of the crack tip silver growth under the quasi-static I-type crack are derived. The crack length and its The evolution of the spreading speed with time, the change of the average stress in the damaged area of the silver streak was analyzed preliminarily, and the lifetime of the PMMA containing the type I crack was discussed.