Journal of Shanghai Jiaotong University ›› 2016, Vol. 50 ›› Issue (02): 194-199.

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A Damage Model Considering Shear Nonlinearity for Progressive Failure Analysis of Composite Laminates

LIU Weiguang,YU Yin,WANG Hai   

  1. (Laboratory of Civil Aircraft Structures Testing, School of Aeronautics and Astronautics, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2015-03-17 Online:2016-02-29 Published:2016-02-29

Abstract: 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 RambergOsgood 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.

Key words: Key words: composite materials, shear nonlinearity, progressive damage, tensile strength