The strain energy density ratio criterion for predicting cracking direction in composite materials is proposed. The Tsai-Hill criterion and Norris criterion of composite materials are extended to predict the cracking direction in compsites.

• 本文提出预测复合材料中裂纹方向的比应变能密度准则；并将Tsai-Hill与Norris准则扩展来预测复合材料中的开裂方向.