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Stress and Strain Data for the Material Definition Dialog Box
The following table lists the type of data you must input when creating a hyperelastic or elastoplastic material using tests. Specify input stress and strain data depending on whether you mean to run a small deformation analysis (SDA) or a large deformation analysis (LDA).
Material
SDA/LDA
Stress
Strain
hyperelastic
LDA
nominal
nominal
elastoplastic
SDA
nominal
nominal
elastoplastic
LDA
true
true
* 
True strain is also called logarithmic, natural or Hencky strain. Nominal strain is also called Cauchy, engineering or nominal engineering strain. True stress is also called Cauchy stress. In a uniaxial tension test, nominal stress is the same as the first Piola-Kirchhoff stress, or engineering stress. (In the general case, nominal stress is the transpose of first Piola-Kirchhoff stress.)
Tests for Elastoplastic Materials
Tests for Hyperelastic Material Definition
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