Strain Rate Compression Performance for a Linear Core Sandwich Beam, I

Abstract

One of the principal manifestations of history dependence in a linear type foam core is rate dependence. This paper details the response in compression to increased strain rate; the test response for a linear core material; the dynamic characteristics of foams; the equation of state for cored sandwich material, including the derivation of the elasto-plastic modulus and the derivation of the dilatational portion of plastic response. Compressive predictive equations are derived and correlated to test data. Finally it is concluded that the damping and modulus of resilience characteristics of the linear core material change within a narrow bandwidth of strain rate which may be a factor in determining the natural frequency of response for linear core sandwich constructions.