Free vibration characteristic of plain woven fabric laminates with multiple delaminations

Based on the first-order shear deformation theory and the lamination model of MSC Patran，an FEA model for plain woven fabric single ply plates was established，and an FEA model for the plain woven fabric laminates with multiple elliptical embedded delaminations was developed. A linearity contact model was used to simulate the interaction between the upper and lower sub-laminates along the delaminated region during the vibration process. From some typical examples，the effects of the elliptical angle of long axis and lengthways embedded delaminations of specimens on the vibration characteristic were discussed. The results show that the distinction of the effect on frequency between surface and inner embedded delaminations was not evident. With the increasing of the elliptical angle of the long axis and lengthways embedded delaminations of the specimens，the influence on the vibration characteristic is increasing.