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UT with SH-waves and electromagnetic ultrasonic -EMUS-transducers

: Hübschen, G.

Review of Progress in Quantitative Nondestructive Evaluation. 9B
New York: Plenum Publishing, 1990 (Review of Progress in Quantitative Nondestructive Evaluation 9B)
Annual Review of Progress in Quantitative Nondestructive Evaluation <16, 1989, Brunswick>
Conference Paper
Fraunhofer IZFP ()
austenitic cladding; austenitic weld; bottom plate of tank; corrosion; EMUS-transducer; SH-wave; surface inspection; ultrasound

In the ultrasonic testing practice of today SV- and longitudinal waves are exclusively used becuse these wave types can be excited by piezoelectric ultrasonic transducers introduced a long, time ago. SH-waves offer a number of advantages compared to SV- and longitudinal waves as for example: - reflection, refraction and diffraction without mode conversion, - complete corner reflection independent of the angle of incidence, - propagation in thick-walled components (d bigger than lambda) as a bulk wave even along the surface, - propagation in thin-walled components (d smaller or equal than lambda) as a guided wave (SH-mode), - no radiation of energy into fluids of small viscosity. In principle it is possible to excite SH-waves by piezoelectric transducers, but in practice these transducers are not applicable due to coupling problems.