Abstract
The article examined the problem of the experimental setting of incidence angles for the generation of Lamb waves in plate-type parts by the non-contact ultrasonic control method. This type of control is mainly done by the use of two types of waves: Rayleigh, which detects invisible defects on the surface of parts, and Lamb waves mode A0 and S0. Mostly used is the mode A0 due to the propagation over distances of interest in the tested materials. One of the primary aim during the testing process is to position the ultrasonic transducers (transmitter and receiver) at oblique angles of incidence on a surface. The transducers should be positioned on an access face of the plate, as is common in industrial practice, at a fixed distance from the measured plate, and leaving an air gap between transducers and the tested plate. The ultrasonic transducers are moved simultaneously linearly or in zigzag on the surface of the plate-type part to measure the hidden defects (cracks, pores, inclusions) that appear in the composite materials during the manufacturing process or during the operation. The presented work brings new insights into the setting of the angle of incidence for generating lamb waves by non-contact method.
Highlights
The article examined the problem of the experimental setting of incidence angles for the generation of Lamb waves in plate-type parts by the non-contact ultrasonic control method
First applications of composite materials in the automotive industry were those in the field of car bodies manufacturing: in 1953 the body of the Corvette Chevrolet (USA) was entirely made of glass-epoxy; in 1968 the rims of the Citroen SM were made of epoxy glass; in 1970 - the bumper of the Renault R5 was made of epoxy glass; in 1980 John Barnard, an engineer in the McLaren Formula 1 team, built the first carbon Kevlar chassis and from other composite materials; in 2002 the body of the McLaren Mercedes SLR series car was made entirely of carbon fiber
As regarding to the use of composite materials in the aircraft manufacturing industry, it is worth mentioning the Boeing 787 Dreamliner passenger plane, which was made of the following materials: 50% - composite materials based on carbon fiber, 20% - aluminum, 15% - titanium, 10% - steel, and 5% other materials [1]
Summary
First applications of composite materials in the automotive industry were those in the field of car bodies manufacturing: in 1953 the body of the Corvette Chevrolet (USA) was entirely made of glass-epoxy; in 1968 the rims of the Citroen SM were made of epoxy glass; in 1970 - the bumper of the Renault R5 was made of epoxy glass; in 1980 John Barnard, an engineer in the McLaren Formula 1 team, built the first carbon Kevlar chassis and from other composite materials; in 2002 the body of the McLaren Mercedes SLR series car was made entirely of carbon fiber. The article examined the problem of the experimental setting of incidence angles for the generation of Lamb waves in plate-type parts by the non-contact ultrasonic control method.
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