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分析了粘弹性基体中环绕纤维的环形裂纹的 型和 型应力强度因子及其时间相关性。根据文献 [1 ]、文献 [2 ]中的弹性解 ,求出了粘弹性基体中环绕纤维的环形裂纹的 型和 型应力强度因子在 L aplace变换域内的解。对其进行 Laplace数值反演后 ,得到了相应的 型和 型应力强度因子在时间域内的变化曲线。结果表明 ,给定长度的环形裂纹在尚未接触界面时 ,其两端正则化的 型和 型应力强度因子均随时间增大而减小。
The type and type stress intensity factors of circular cracks around the fiber in viscoelastic matrix and their time correlation are analyzed. According to the elastic solutions in [1] and [2], the solution of the ring-shaped crack and the type of stress intensity factor around the fiber in the viscoelastic matrix are obtained. After Laplace numerical inversion, the corresponding curve of stress intensity factor in the time domain is obtained. The results show that the regular and type stress intensity factors at both ends of a given length of annular crack decrease with time when the interface has not been contacted yet.