von Mises curve material models are available for beam, 2D, shell, brick and tetrahedral elements. These material models are almost identical to the von Mises Material Properties. The difference is that you will define a stress-strain curve that will be used to determine the stress values. The von Mises curve material properties are listed below. It may also be necessary to define some Isotropic Material Properties.
Stress-Strain Data
Define the stress-strain curve for the plastic region by entering a series of points along the curve. This creates a multi-linear stress-strain curve. During the analysis, each segment of the multi-linear stress-strain data will be linearly interpolated between strain values.
Note the following behavior of the input:
- Enter tensile stress and strain values. The material is assumed to behave the same in tension and compression.
- The first row corresponds to the yield stress.
- Since the modulus of elasticity, yield stress, and strain at yield are directly related, only the first two items can be entered. The strain at yield will be calculated automatically.
- If the material properties for a part are loaded from a material library, and if the material library does not have the stress-strain curve entered, the stress-strain data will be approximated from the library's modulus of elasticity, yield stress, ultimate stress, and elongation at 2 inches.
Important: See the
Structural Instability
section on the
von Mises Material Properties page. The same warnings and guidelines apply to the von Mises Curve material model too.