Nonlinear Analysis – Stress / Strain Curves for Material Models
Article by Irfan Zardadkhan, PhD, CSWE updated May 27, 2014
Article
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 model | Small Strain, Small Displacement | Small Strain, Large Displacement | Large Strain, Large Displacement |
|---|---|---|---|
| Nonlinear Elastic | True Stress, Engineering Strains | True Stress, Engineering Strains | N/A |
| Elasto – Plastic von Mises Plasticity, Tresca Plasticity, Drucker Prager | True Stress, Engineering Strains | True Stress, Engineering Strains | True Stress, Logarithmic Strains |
| Hyper Elastic: Mooney-Rivlin, Ogden, Blatz Ko | Engineering Stress, Stretch ratio | Engineering Stress, Stretch ratio | Engineering Stress, Stretch ratio |
| Super Elastic | True Stress, Logarithmic Strains | True Stress, Logarithmic Strains | True Stress, Logarithmic Strains |
| Viscoelastic | True Stress, Engineering Strains | True Stress, Engineering Strains | N/A |
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