Determination of the symmetries of an experimentally determined stiffness tensor: application to acoustic measurements
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文摘
For most materials, the symmetry group is known a priori and deduced from the realization process. This allows many simplifications for the measurements of the stiffness tensor. We deal here with the case where the symmetry is a priori unknown, as for biological or geological materials, or when the process makes the material symmetry axis uncertain (some composites, monocrystals). The measurements are then more complicated and the raw stiffness tensor obtained does not exhibit any symmetry in the Voigt's matrical form, as it is expressed in the arbitrarily chosen specimen's base.