Theoretical prediction for Young's modulus and yield strength of high-density foamed plastics

The mechanical properties of high density foamed plastics under uniaxial load are investigated and the relations of shear modulus and yield strength with porosity are derived from the self consistent model. The results show that not only can the same shear moduli with the ones derived from the three phase spheroidal model be obtained with the present model, but also the theoretical yield strength of high density foamed plastics can be obtained. By comparing the present results with those of other empirical models as well as the available experimental data, it is shown that the yield strength of high density foamed plastics can be predicted quite well with this model.