A common issue when creating a metal plasticity model in Abaqus is the need to convert the test data from a typical tensile dogbone test to the appropriate set of data for defining the Elastic and Plastic parts of the material model.  Part of this conversion process is separating things into their Elastic and Plastics parts.  The most common way to define the plasticity (*plastic keyword in the input file) is with a series of data pairs of , but these stress & strain values in Abaqus must be in true stress / strain.  From the test we usually have engineering, or nominal, stress / strain values.  While our class Metal Inelasticity in Abaqus speaks to this issue, I though it would be helpful to demonstrate an Abaqus/CAE plug-in tool that helps process test data into the Elastic and Plastic parts needed to define the Abaqus metal plasticity model (here we are referring to the simple Mises isotropic model).

In the narrated video below, we review a few PowerPoint slides, show some test data in Excel, then demonstrate the Abaqus/CAE plug-in tool.  The plug-in tool can be downloaded from our Knowledge Base from QA00000009204, titled "Plug-in utility to convert nominal plastic stress-strain data", or search on the phrase "nom2true".  This video will play more clearly if downloaded first. Video file size is 53Mb, and about 16 minutes in duration.

Back to:  Material Modeling and Calibration - An Overview and Curriculum