TY - JOUR PY - 2007// TI - A New Analytical Model for High-Velocity Impact of Thick Composites JO - International journal of crashworthiness A1 - Cheng, WL A1 - Itoh, S A1 - Jen, KC A1 - Moatamedi, M. SP - 57 EP - 65 VL - 12 IS - 1 N2 - A new analytical impact/penetration model has been developed for high-velocity impact of thick composite targets using a spring-mass equivalent energy dissipating finite element/finite difference scheme. The initial basic model includes energy dissipating mechanisms such as punching shear and fiber breakage. The impact/penetration law, which is based on a linear distribution of punching shear force, is represented by a stiffness parameter. The equivalent variable mass of the composite target is built into the model by considering two-dimensional shear wave propagation, and its effective stiffness was initially represented by a nonlinear spring stiffness that is obtained from analyzing an infinite hollow cylinder subjected to internal in-plane shear. The two stiffness parameters are characterized by analyzing the forces between the impactor and the composite target at increasing depths of penetration through a series of quasi-static finite element analyses. Results are used to provide a more accurate prediction if the impactor would perforate or stop, and to obtain an estimate of its exit velocity or the depth of penetration for both blunt-ended and sharp-ended impactors penetrating a thick composite target at high speed. Analyses were performed to demonstrate different high-velocity impact scenarios.

Language: en

LA - en SN - 1358-8265 UR - http://dx.doi.org/ ID - ref1 ER -