Depth of Penetration (DoP) experiments have been conducted on thick section S-2 glass/epoxy laminates impacted by 64 grain steel projectiles over an impact velocity range of 400 m/s to 1400 m/s. Under high velocity impact, the composite under the projectile is highly compressed and crushes into powder. A theoretical model is developed to reduce DoP data that relates the plastic/granular wave velocity, plastic/granular strain and strain rate during penetration to the strain rate dependent dynamic punch crush strength and plastic/granular erosion strain of composite for the first time in the literature. Punch crush strength is an important material property used in rate dependent progressive composite damage continuum material models with a phenomenological element erosion criterion. The experimental results show that that the punch crush strength transitions from a semi-log to a linear strain rate dependence at higher rates. DoP testing on thick section composites are presented to study the effects of fiber volume fraction and fabric architecture on depth of penetration, damage modes and rate dependent punch crush strength of glass/epoxy laminates.