Modeling Energy Absorption With A DamageMechanics Based Composite Material Model

摘要

This paper examines the basic assumptions in the Matzenmiller-Lubliner-Taylor (MLT) model and its application in modeling energy absorption of composite structures in crashworthiness applications. The MLT model is a continuum damage mechanics (CDM) model for unidirectional fiber composites. It was implemented as MAT58 in LS-DYNA. It was found that the assumption of linear elastic unloading and reloading in MLT model resulted in a lower calculated energy absorption in composite tube axial crush simulations. A modification to compressive unloading was proposed and tested in an MLT theory based user material model. The modified MLT model improved the stability of the tube crush simulation and the simulation results.