Nonlinear Analysis – Stress / Strain Curves for Material Models

Article by Irfan Zardadkhan, PhD, CSWE updated May 27, 2014

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Depending on the settings, nonlinear analysis may require the input of stress / strain curves. When that is the case, the curve should be entered using the correct definition/values for stress and strain. As a matter of fact, several definitions of stress exist: true stress, engineering stress. And several definitions of strain exist as well: engineering strain, logarithmic strain.

The table below summarizes the type of stress and strain to be used for the stress/strain curve, depending on the analysis option and the type of material model used.

Type of material modelSmall Strain, Small DisplacementSmall Strain, Large DisplacementLarge Strain, Large Displacement
Nonlinear ElasticTrue Stress, Engineering StrainsTrue Stress, Engineering StrainsN/A
Elasto – Plastic von Mises Plasticity, Tresca Plasticity, Drucker PragerTrue Stress, Engineering StrainsTrue Stress, Engineering StrainsTrue Stress, Logarithmic Strains
Hyper Elastic: Mooney-Rivlin, Ogden, Blatz KoEngineering Stress, Stretch ratioEngineering Stress, Stretch ratioEngineering Stress, Stretch ratio
Super ElasticTrue Stress, Logarithmic StrainsTrue Stress, Logarithmic StrainsTrue Stress, Logarithmic Strains
ViscoelasticTrue Stress, Engineering StrainsTrue Stress, Engineering StrainsN/A
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Irfan Zardadkhan, PhD, CSWE

Irfan holds a PhD in Aerospace Engineering and is as Elite AE. He contributes regularly to the SIMULATION and COMPOSER tech blogs. He has won the TenLinks Top blogger award for SOLIDWORKS. He has presented at local user groups and at SOLIDWORKS World.