After selecting Orthotropic 2D from the Type drop-down, the following material sections will be available: General, Structural, Allowables, and Thermal.
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General
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Structural
- You can input Young’s moduli, shear moduli, Poisson’s ratio, thermal expansion coefficients, mass density, material damping coefficient, and material reference temperature under the General and Structural section.
- An approximate value for G1Z and G2Z is the in-plane shear modulus G12. If test data is not available to accurately determine G1Z and G2Z, the value to G12 may be supplied for G1Z and G2Z.
- The mass density, RHO, will be used to automatically compute mass for all structural elements.
- To obtain the damping coefficient GE, multiply the critical damping ratio C/C0 by 2.0. If a dominate frequency is not defined for Material Structural Damping (see Dampings section), GE is ignored in transient response analyses.
- TREF and GE are ignored if the orthotropic 2D material is referenced by a composite layup entry.
- TREF is used only as the reference temperature for the calculation of thermal loads in linear solutions. If an initial temperature load is specified, TREF will be ignored.
- Material stability requires that:
If either condition is not met, a warning message will be issued.
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Allowables
- You can input allowable values for tension in lateral and longitudinal directions, compression in lateral and longitudinal, and shear under Isotropic Allowables section.
- Xt, Yt, and S are required for composite element failure calculations when requested by the failure theory drop-down of the composite layup editor. Xc and Yc are also used, but not required.
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Thermal
- For thermal analyses, you can input values for a conductivity matrix, specific heat, and mass density under the Thermal section. Mass density is repeated since it may be a requirement in thermal analysis as well as in structural analysis.
- Kij forms a conductivity matrix.