基于修正的Ｈａｈｎ－Ｔｓａｉ非线性本构关系，用准三维有限单元法分析了由层间应力引起的材料沿厚度方向的非线性对复合材料层板分层后屈曲及能量释放率的影响，结果表明材料非线性对能量释放率的影响与后屈曲形态密切相关，其中对Ⅱ型分层能量释放率的影响较大，而分层尖端应力场降低，局部变形增大． Based on the modified Hahn-Tsai nonlinear constitutive relationship, the quasi-three-dimensional finite element method was used to analyze the effect of material nonlinearity along the thickness direction on the buckling and energy release rate of composite laminates after the layer stress was induced. Results It is shown that the influence of material nonlinearity on the energy release rate is closely related to the post-buckling morphology, of which the influence on the energy release rate of type II stratification is large, while the stress field of stratified tip decreases and the local deformation increases.