Characterizing anisotropy and uniaxial stress with zero group velocity Lamb modes | CU Experts

The quality and mechanical properties of components built with metal additive manufacturing (AM) are highly dependent on the microstructure formed during solidification. There currently exists a need for ex-situ qualification of materials for accurate characterization of microstructural features. Here we investigate advanced laser-based ultrasound techniques for measuring microstructural features such as anisotropy and residual stress, which are common in AM fabricated metals. Here we employ zero group velocity (ZGV) resonances to characterize material anisotropy and to quantify uniaxial stress in tensile stress measurements of aluminum alloy dog bone samples.

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