COMPOSITE DAMAGE MODELING UNDER QUASI-STATIC, LOW VELOCITY IMPACT, BALLISTIC AND BLAST LOADING CONDITIONS

摘要

Performing experiments in numerical space and predicting accurate results are the main research focus of many computational mechanicians. These goals may in general sound challenging, however, makes perfect sense in cases where experiments are not possible, e.g., landing on Mars, sea waves impacting marine structures, crash landing of space shuttle, etc. Composite damage modeling plays a vital role in designing composite structures for damage tolerance, energy dissipating crash, impact, ballistic, and blast applications. A progressive composite damage model is developed by Materials Sciences Corporation and further modified by the authors and implemented in explicit finite element analysis code LS-Dyna. A total of thirty-four material properties and parameters are required to define such a material model. Besides the ASTM standard test methods for determining the elastic and strength properties, the authors have developed a quasi-static punch shear test methodology in determining the rate insensitive model parameters. Recently, model validation with ballistic experiments have been performed to determine the rate sensitive model parameters. These validated model parameters are used to predict composite damage and resistance behavior of composite structures made from plain-weave plain weave S-2 glass/SC15 composites under quasi-static, low velocity impact, ballistic, and blast loading conditions. Analysis procedure and results of these numerical experiments are presented.