Non-contact evaluation of spot-welded nugget size based on measuring diffracted Lamb waves by focused air-coupled ultrasound
نویسندگان
چکیده
منابع مشابه
Diffracted and Head Waves Associated With Waves on Nonseparable Surfaces
A theory is presented for computing waves radiated from waves on a smooth surface. With the assumption that attenuation of the surface wave is due only to radiation and not to dissipation in the surface material, the radiation coe cient is derived in terms of the attenuation factor. The excitation coe cient is determined by the reciprocity condition. Formulas for the shape and the spreading of ...
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Conventional air-coupled ultrasound (ACU) is a well-established tool for acoustic NDT and material characterization. Its major shortcoming is concerned with a week penetration into solid materials due to a severe impedance mismatch at the air-solid interface. A dramatic rise in acoustic coupling is obtained by using acoustic mode conversion into plate and surface waves in slanted configurations...
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Ultrasonic methodologies of air-coupled guided waves, birefringent shear waves, and nonlinear ultrasound are presented and applied to the characterization of aerospace materials. The guided waves generated by air-coupled ultrasound provide non-contact monitoring of in-plane stiffness anisotropy and high-contrast imaging of defects in a single-sided access configuration. Mapping of local fibre o...
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Non-contact air-coupled technique has been applied to measure ultrasonic velocities in two planar samples, Plexiglas and mortar. Longitudinal waves and mode-converted shear velocities were obtained by three approaches. The obtained velocities were compared with that measured by contact method. The results demonstrate that non-contact air-coupled technique has great potential for the comparative...
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ژورنال
عنوان ژورنال: Transactions of the JSME (in Japanese)
سال: 2015
ISSN: 2187-9761
DOI: 10.1299/transjsme.15-00107