%A LIU Weiguang,YU Yin,WANG Hai %T A Damage Model Considering Shear Nonlinearity for Progressive Failure Analysis of Composite Laminates %0 Journal Article %D 2016 %J Journal of Shanghai Jiao Tong University %R %P 194-199 %V 50 %N 02 %U {https://xuebao.sjtu.edu.cn/CN/abstract/article_41193.shtml} %8 2016-02-29 %X Abstract： A damage model considering the effect of shear nonlinearity was proposed to predict the ultimate load of laminated composites which exhibited significant shear nonlinearity. Shear nonlinearity constitutive relations for the laminates were defined with the RambergOsgood equation. Based on continuum damage mechanics, a three dimensional FE model for damage analysis of composite materials was established. The onset of the damage of composite laminates was modeled with 3D Hashin’s initiation criterion and Ye criterion. The damage index was applied to analyze the damage extension. The model was implemented with a UMAT subroutine. The convergence was improved by using the viscous regularization method. The model was applied to the progressive failure analysis of notched AS4/PEEK composite laminates. Simulation results agreed well with the experimental date, which indicated that the proposed model had a better accuracy than the model published.