A Multiple Term Viscoelastic Constitutive Model Implemented and Applied for Plastic

This paper discusses implementation and application of a multiple term viscoelastic constitutive model suitable for plastic materials. The constitutive model uses Feng’s recursive formula where the stress updates depend only on the stress terms in the prior state. The multiple term creep equations are accurate over longer periods of time. A tensile test simulation shows that the model provides reasonable results. Then a press fit example shows the holding force depends on time according to viscoelasticity.