The results show that when the annular crack is away from the interface, the normalized stress intensity factors at the crack tips decrease with increasing time.

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。

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Solves the problem of boundary value on an annular crack by using the nonlocal stress solution of an axisymmetric crack problem and approximative method of series expansion.

利用已得到的三维轴对称问题的非局部弹性应力的解，采用级数近似展开的方法，求解环状裂纹的边值问题。

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The horizontal annular and vertical crack of the high buildings, along with the horizontal crack and the crush of RC column can be due to the vertical seismic component action.

高耸建筑的水平环缝和竖向裂缝、钢筋砼柱的水平裂缝以及压溃破坏等震害现象，可以归结为地震竖向分量的作用；

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