Progressive damage modeling of plain weave E-glass/phenolic composites

Abstract

An optimized set of material properties and parameters for E-glass/phenolic composites is determined for use in the rate dependent composite damage model MAT162 in LS-DYNA. The model requires 39 material properties and parameters, and is able to capture the seven different damage modes and post damage softening behavior of composites. The unknown MAT162 parameters were determined by conducting parametric simulations of low velocity impact (LVI), depth of penetration (DOP), and ballistic impacts. The modulus reduction parameter OMGMX is found by simulating LVI tests and varying the values of OMGMX to find the best agreement with LVI experimental data. The limit of compressive volume strain for element eroding was found by simulating DOP experiments and comparing the results to the experimental data. Then the element eroding axial strain E_LIMT and EEXPN were determined by simulating ballistic impact experiments. When the optimized values were determined, analysis of ballistic experiments were conducted and compared to the experimental impact versus residual velocity curve. The results of the simulations were in excellent agreement with the experimental data.