Damage Tolerance of Laminated Composites Subjected to Low-Velocity Impact

摘要

This paper describes the development of the Design tools for advanced composite materials based on damage models which is the primary objective of the ADANIDEC project. In the experimental phase of this project, small-scale tests, involving loading and unloading loops have been carried out on each material specimen of a laminate to obtain the required data on which theories of the material behavior involving the initiation and the growth of damage (e.g. fiber-breakage, matrix cracking, fiber-matrix debonding) can be build up. A programme of low velocities impact tests have also been carried out to characterize the impact response of the chosen materials. In the analytical phase, a material model based on damage-mechanics has been developed for four types of composite and incorporated into the dynamic finite element stress analysis procedure from which the initiation and the progression of damage during the impact event have been predicted. Experimental observations and numerical predictions were compared for selected composite laminates." A database which contains material properties as well as experimental and numerical results has been produced and interfaced with the structural analysis codes DYNA3D, ANSYS and MODULEF. An open Software Environment (ADANIDEC Space) has been realized for helping to analyse and predict the behavior of advanced composite material.