Memory integer model parameters based on polyurethane foam experimental compression tests

International audienceThe polyurethane foam (PU) undergoing large compressive deformation exhibits highly nonlinear elasticity and viscoelastic behaviour. The principal aim of this paper is to modeling this behaviour using a memory integer model which describes the nonlinearity by polynomial function and the viscoelasticity by convolution function. A unidirectional compression tests are considered to identify experimentally the mechanical parameters of model. The difference between force responses of foam in load and unload phases constitute the base element of the identification methodology. Many precautions are taken into account to find accurate results that verify thermodynamics conditions. Finally, the reliability and also the limits of the memory integer model are discussed