In this thesis, the stress intensity factors of top-down cracks caused by loading are calculated using three dimensional finite element model and compared to the results of plane strain model.

本文采用三维有限元模型分析了荷载作用下自上而下裂缝尖端的应力强度因子，并与二维平面应变模型分析的结果进行比较。

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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 paper studies distribution law of stress and strain of gate-dam under static regime with three-dimensional finite element method.

本文采用三维有限元方法，研究堰闸坝在静力状态下其应力和变位的分布规律。

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