Nonlinear numerical elasticity analysis of eccentric low-velocity impact of rectangular sandwich plate with composite face sheets subjected to biaxial preloads

Most of the studies done in low velocity impact of plates only involve plate’s response to centric impact and usually have been done in no-preload condition. In this study، nonlinear numerical elasticity analysis of eccentric low-velocity impact of rectangular sandwich plate with composite face sheets subjected to biaxial preloads، and the effect of indenter energy، the stiffness of core، the thickness of core، geometry of indenter and the existence of epoxy layers in the connection between core and face sheets on impact response are investigated. In this regard، impact 3D simulation in ABAQUS rather than approximate plate theories is utilized for extracting impact responses based on the three-dimensional theory of elasticity. Numerical results are compared with experimental data presented in other references and the numerical model is verified. The analysis results showed that the contact force increased due to the reduction of overall plate movement in the cases of eccentric impact and biaxial tension preloads، which result in augmentation of damage.