A generalized solution methodology to predict the perforation of composite plates and sandwich panels subjected to projectile impact was proposed in this paper. Discrete spring-mass models were used to calculate the deformation response of the composite panels and sandwich panels. Equivalent load resistance functions were obtained from quasi-static analyses and adjusted for high strain rate effects. A generalized solution methodology for projectile impact of composite plates and sandwich panels was then proposed based on three key factors: (i) the contact load duration, (ii) the through-thickness transit time, and (iii) the lateral transit time. Simple failure criteria based on in-plane tensile tearing and transverse shear fracture were used to calculate the ballistic limit. A high velocity impact model based on two-dimensional wave propagation was used to determine the ballistic limits of E-glass/polyester panels and predicted values were found to be within 20% of the experimental results. A low velocity impact model was used to predict the ballistic limit for E-glass/epoxy-aluminum honeycomb sandwich impacted by hemispherical nose projectile and the predicted values were within 11% of test results.
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