LAUSR

Abstract The inhomogeneous in-plane elastic property can be described by the in-plane elastic anisotropic constants (IEACs) at different depths (such as the rolling plate), which have significant impact on the in-plane plastic behavior. The IEACs should get more attention in the design and the service of structural components. To measure IEACs of aluminum plate at different depths, an ultrasonic approach using the longitudinal critical refracted (LCR) wave is proposed. The relation between IEACs and LRC wave velocity is described analytically. So, the IEACs can be calculated by measuring the LCR wave velocities along different directions. Experimentally, this approach was applied to measure the IEACs of rolling 2219-T6 aluminum alloy plate at different depths. The distribution of C11 and C22 of the same depth indicated that the aluminum plate exhibited homogeneous property at the same layer. As for IEACs at different depths, aluminum plate showed transverse symmetry at the surface layer and orthotropic symmetry at the inner layer near the median plate plane.