Matrix Cracking in Cross Ply Laminates under Bending

摘要

This work presents approximate analytical solution based on a variational approach for stresses in a [90{sub}m/0{sub}n]{sub}s cross ply laminate with matrix cracks in the 90° layer, subjected to pure bending. The analysis assumes a plane stress state in longitudinal sections of the laminate. Comparison of the solution from this approach with finite element simulation results shows that the stress components in the cracked layers in the regions of interest are in good agreement. The model is therefore suitable for predicting matrix crack multiplication in addition to estimating the residual flexural stiffness under bending. The results obtained show that the transverse normal stress at the 0/90 interface is tensile in regions of the interface closer to the crack. Thus the analysis suggests that delamination is likely before matrix crack saturation under bending for this case..