Combining Elastoplastic and Creep Material Models

Application ID: 12397

This model shows how to combine different types of material nonlinearity, such as creep and elastoplasticity. In this specific example you will perform a stress and nonlinear strain analysis on a thick cylinder under a nonproportional loading: an initial temperature increase followed by a fluctuating pressure applied to the internal surface of the cylinder.

This load case involves two different nonlinear material behaviors: elastoplasticity and creep. The plastic behavior is introduced during the temperature increase and the rapid change of the pressure sign. The creep behavior develops under the constant pressure load applied to the pipe for a sufficiently long period of time.

The original model is a NAFEMS benchmark model described in Selected Benchmarks For Material Non-Linearity. The COMSOL Multiphysics solutions are compared with the reference data.

This model example illustrates applications of this type that would nominally be built using the following products:

Nonlinear Structural Materials Module