In immersion shear wave testing, waves are generated by angulating the transducer beyond the first critical angle. What is the direction of the material's particle motion?

In immersion shear wave testing, waves are generated by angulating the transducer beyond the first critical angle. What is the direction of the material's particle motion?

• A. Perpendicular to the direction of wave propagation
• B. The same as the wave propagation
• C. Normal to the material surface
• D. Parallel to the direction of wave propagation

Answer: (A)

In immersion shear wave testing, angulating the transducer beyond the first critical angle generates a shear (S) wave in the material. Shear waves are transverse, meaning the particle displacement is perpendicular to the direction the wave is traveling. So the material’s particles move in a direction that is orthogonal to the wave's propagation path. This distinguishes them from compressional (P) waves, where particle motion is parallel to propagation.

In immersion shear wave testing, angulating the transducer beyond the first critical angle generates a shear (S) wave in the material. Shear waves are transverse, meaning the particle displacement is perpendicular to the direction the wave is traveling. So the material’s particles move in a direction that is orthogonal to the wave's propagation path. This distinguishes them from compressional (P) waves, where particle motion is parallel to propagation.