Abstract
In this paper it is shown that relative ultrasonic velocity measurements can be used to determine the difference of normal stress components ( T 22 − T 11) in non-homogeneous, anisotropic plates containing arbitrary residual stress states. It has previously been demonstrated that measurements with horizontally polarized shear waves (SH-waves) can be used to determine ( T 22 − T 11) unambiguously in plates with unknown material property variations. However, previously the theory relating the velocity of SH-waves to stress and material anisotropy was limited to the case where the principal directions of stress are parallel to the axes of material symmetry. In this paper, we remove this restriction by extending the theory. We also suggest possible experimental procedures for validating the new theory.
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