OOF: Finite Element Analysis of Microstructures

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A material with hexagonal symmetry has 5 independent elastic constants and 2 independent coefficients of thermal expansion. See figure 4.2.


If unrotated (orientation= 0), a hexagonal element is isotropic in the $xy$ plane (the plane of the screen), with the crystalline $c$-axis in the $z$ direction (out of the screen). See Section 4.3. [degrees]

thermoelastic coefficients
The components of the stiffness matrix are c11, c12, c13, c33, and c44. The two independent coefficients of thermal expansion are alpha11 and alpha33.

Figure 4.3: Symmetry relations for Orthorhombic classes and point groups in the Trigonal class. See Figure 4.2 for explanation of symbols.
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