Based on the stationary condition of energy functional, we set up the integral theorem along the boundary of arbitrary element and get the energy release quantity with the integral theorem.

根据裂纹扩展时能量泛函的驻值条件，建立了任意元素的围道积分定理。

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Based on the stationary condition of energy functional, we set up the integral theorem along the boundary of arbitrary element and get the energy release quantity with the integral theorem.

根据裂纹扩展时能量泛函的驻值条件，建立了任意元素的围道积分定理。

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