Finite-element modelling of the impact response of a laminated composite plate

An investigation into the response of a fibre-reinforced composite plate subjected to a central impact by a blunt-ended projectile, shows that coupling between the dynamic response and the stiffness degradation due to damage must be accounted for in any model capable of predicting damage: by impact. A numerical model based on the finite-element displacement method that includes the effects of transverse shear deformation and a failure algorithm that describes the energy dissipation during the damage process has been developed for the purpose of the analysis. The interaction force between the projectile and the plate is modelled as an integral part of the solution algorithm, thus neglecting the assumption of an initial contact-pressure profile. Numerical results for laminate deformation are shown to compare qualitatively well with experimental tests. Numerical values for stresses in the plate are computed and the effect of anisotropy on stress and deformation profiles are identified and discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.