Introduced in this paper are two fracture critical surfaces of three dimensional mixed mode obtained from the theory of strain energy density factor and the theory of maximum tensile strain.

本文对按应变能密度理论和最大拉应变理论所推导出的两个三维复合型断裂临界曲面作了简要介绍。

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The new criterion includes the integral features of the whole field, while the theory of minimum strain-energy-density factor considers only a single point in the crack tip field.

较之仅着眼于纹尖场某一点的最小应变能密度因子理论，新判据更多地顾及到了尖端场的全局。

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