Orthotropic materials

Orthotropic materials are characterized by three mutually perpendicular planes of symmetry and nine independent elastic constants. The strain-stress relations, when written with respect to the principal material axes, are given by:

Similar to anisotropic materials, the base vectors used to establish the material matrix must be defined and fixed in the material by using material orientation vectors.

To fully characterize an orthotropic material, a coefficient of thermal expansion, α, is required to compute thermal strains. The thermal strains in an orthotropic material are computed from:

Similar to elastic constants, the coefficients of thermal expansion, αxx, αyy, αzz, must be defined with respect to the principal material axes. ΔT is the difference between the material temperature and the strain-free reference temperature.

These tests are performed to ensure that the material constants are physically meaningful:

See Thermal material properties for more information on specifying thermal properties for orthotropic materials.

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Understanding stress-strain yield stress input for Samcef

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Orthotropic Material dialog box (Simcenter Samcef Structure)

Viscoelastic properties in the Material dialog box (Simcenter Samcef)

Viscoplastic properties in the Material dialog box (Simcenter Samcef)

Yield criterion in the Elastoplastic Material dialog box (Simcenter Samcef)

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Orthotropic materials, Simcenter 3D 2021.1 Series

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