Improved Theory for Contact Indentation of Sandwich Panels

摘要

Core crushing and large face-sheet deflections are incorporated in a theory for contact indentation of sandwich panels. The model is based on the assumption of axisymmetric indentation of an infinite elastic face sheet bonded to an elastic-ideally plastic core on a rigid foundation. After core yielding, the problem is separated into an outer region where the core is elastic and an inner region where the core exerts a constant reactive pressure on the face sheet. The outer region is modeled as a plate on an elastic foundation. The inner region is modeled using small-deflection plate theory, first-order large-deflection plate theory, and membrane theory.