A NUMERICAL INVESTIGATION OF DYNAMIC TRANSVERSE SHEAR FAILURE

摘要

A dynamic test to determine the high strain rate transverse shear strength of a composite has been investigated by finite element analysis. The failure prediction using a solid element based numerical model is severely influenced by the mesh density when stress singularities exist at the failure position. The introduction of zero-thickness interface elements between potential failure planes of the model effectively eliminates the mesh dependency problems. The baseline interface element based model still predicts failure at a lower failure stress than the experimental result. The differences are interpreted as being due to the influence of compressive stresses on the delamination threshold at the failure initiation points. A set of modified failure initiation and propagation criteria are proposed for the interface elements to take the influence of compression on matrix shear strength and GIIC into account.