Abstract: In order to study the effect of wrinkle defects on the tensile properties of glass fiber reinforced resin matrix composite laminates, Abaqus finite element software was combined with USDFLD subroutine to establish a progressive damage analytical model for wrinkle-containing glass fiber reinforced composite laminate. The strength degradation and progressive failure process of wrinkle-containing laminates under tensile load were studied by numerical simulation analysis. The influence of wrinkle aspect ratio on the tensile properties of laminates was analyzed. The results show that the strength prediction value and the initial position of the damage are in good agreement with the experimental results in the literature, verifying simulation analysis model. The tensile failure load and strength decrease significantly with the increase of the wrinkle aspect ratio. Under the application of tensile load, there is stress concentration in the wrinkle deformation layer adjacent to the resin-rich area. The damage of the laminate is gradually extended from the resin-rich area to the wrinkle deformation area, and finally completely fails in the wrinkle deformation area. Affected by wrinkles, the laminates undergo bending deformation during the stretching process. In the linear elastic stage, the deformation increases with the increase of the wrinkle aspect ratio under the same load condition.

Key words: wrinkle, composite, progressive failure analysis, tensile property