MODEL OF DEFORMATION OF MONOTROPIC PLASTIC FOAMS PARALLEL TO THE FOAM RISE DIRECTION BASED ON THE VOLUME DEFORMATION HYPOTHESIS

摘要

Deformation properties of monotropic plastic foams under uniaxial deformation (compression or tension) parallel to the foam rise direction is considered. Theoretical results are obtained in case the volume deformation hypothesis is assumed. The validity of neglecting the fluctuation component in calculations of the effective volume strains of foams is substantiated. A tie condition permitting the semiaxes sought-for to vary not obligatory equally is derived. Values of Young's modulus and Poisson coefficients are obtained for a wide range of model cell stretch ratios and foam space filling coefficients. A comparison of the theoretical results with experimental data available is performed.