Nonlinear Analysis – Stress / Strain Curves for Material Models

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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