Bio-based composites have gained higher importance due to their low-cost, recycling and moderate mechanical properties. Engineering structures under blast, crush and other different pressure loadings can be manufactured using materials such as sisal based bio composites. In this study, sisal fiber reinforced plastics have numerically been investigated under singular and repeated blast pressure effects. To make a prediction for experimental procedures in next phase, LS-DYNA modeling capabilities has been investigated. For this purpose, different modeling techniques such as Lagrangian and coupled methods are used. Midpoint deflection and internal energy history curves have been plotted for glass fiber reinforced and sisal fiber reinforced plastics for comparison. (C) 2016 The Authors. Published by Elsevier Ltd.