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In specifying the stiffness or compliance matrix of an anisotropic material,
convention dictates that the coordinate and symmetry systems are aligned
to minimize the number of non-zero coefficients; that is, we like to seperate
elastic and geometric degrees of freedom. For example, the twelve (nine
independent) non-zero coefficients of an orthorhombic system are so
| |
(1) |

because we have aligned the coordinate system with the three symmetry axes.

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Stanford Exploration Project

12/18/1997