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本文研究了裂纹尖端位于各向同性材料及正交异性材料两相介质界面并且裂纹位于各向同性材料内Ⅰ型裂纹平面应变问题的塑性应力场．将各向同性材料及正变异性材料分别视为满足Ｍｉｓｅｓ屈服准则及Ｈｉｌｌ屈服准则的理想塑性材料，得到了裂纹尖端塑性应力场．
In this paper, the plastic stress field of the crack tip in the isotropic material and the interface of the orthotropic material in the two-phase medium and the crack in the isotropic material is investigated. The isotropic material and the positive material are regarded as the ideal plastic material meeting the Mises yield criterion and the Hill yield criterion, respectively. The plastic stress field at the crack tip is obtained.