Complete Guide to Using PolyUMod with COMSOL Multiphysics

Introduction

Did you know that it is easy to use all the advanced non-linear viscoplastic material models in the PolyUMod library with COMSOL Multiphysics? In this article (and video), I will show how you can use the PolyUMod Bergstrom-Boyce (BB) model to simulate the tensile behavior of an ASTM D638 Type V dogbone-shaped specimen under cyclic tensile loading using COMSOL Multiphyics. The steps listed below summarize the key steps that may be unique when using a PolyUMod material model in COMSOL Multiphysics. The video at the bottom of this page is a complete step-by-step guide to using PolyUMod with COMSOL.

Step 1: Export Material Model from MCalibration

Export the PolyUMod material model into COMSOL csv-file format.

The contents of the exported file are shown below.

Step 2: Setup the Material Model in COMSOL Multiphysics

Within COMSOL Multiphysics, right-click on Materials, and select External Material. Then setup the PolyUMod material model as indicated in the figure below. Note that the number of state variables (here 13) is specified in the file that was exported from MCalibration in Step 1.

Then copy the list of material parameters from the file that was exported from MCalibration in Step 1, and paste that list into the Value field (in red) below.

Step 3: Add The Material Model to the Solid Mechanics Node

Right-click on Solid Mechanics and Select Material Models > External Stress-Strain Relation. Then select the PolyUMod material model in the External material drop down list.