Ultrasonic investigation of the effect of compressive strains on 3D periodic bi-material structures

Due to the specific elastic properties such as high stiffness mass ratio, regular microstructure materials are widely used in industry. The need for nondestructive evaluation is ubiquitous ensure material quality. As an effective testing method, ultrasound has great potential providing efficient characterization. However, contrary more convenient applications, challenges arise when applying 3D bi-material structures due coexistence of different phenomena, including diffraction effects caused by periodicity. Two linear methods, namely Bragg and comb filtering effect, proposed address this hurdle. results show that effect effectively characterizes, respectively, vertical structural quality bi-material. can also expose variations horizontal plane.