本文提出并验证了用于计算复合材料层合板分层能量释放率的三维裂尖单元分析(3DCTE)方法。在放松裂尖位移约束的条件下,运用经典层合板理论,得到以层合板铺层方式、结构几何和外载荷为参数的能量释放率解析解。研究张开弯矩和面内剪切载荷作用下的分层前缘能量释放率,发现对于较广泛的铺层形式,尤其是各向异性程度高、耦合效应显著的铺层,3DCTE方法均能有效地表达各应变分量对总能量释放率的影响,具有较高的分析精度。 This paper presents and validates a 3D crack tip element analysis (3DCTE) method for calculating the delamination energy release rate of composite laminates. Under the constraint of displacement of the crack tip, the analytical solution of the energy release rate based on the lamination method, the structure geometry and the external load is obtained by using the classical laminate theory. The energy release rates of delaminated leading edge under open bending moment and in-plane shear loading are studied. It is found that the 3DCTE method is effective for a wide range of lay-up patterns, especially in the case of high anisotropy and coupling effects The expression of each strain component on the total energy release rate, with high accuracy.