Abstracts: NDT of Railway

NDTnet 1998 July, Vol.3 No.7

NDT of Railway

METADEX Antwortnummer 10 - © 1998 CSA
Title
	Ultrasonic set-up to characterize stress states in rims of railroad wheels.
Author
	Herzer, R. (Fraunhofer Institute for Nondestructive Testing); Frotscher, H. (Fraunhofer Institute for Nondestructive Testing); Schillo, K. (Fraunhofer Institute for Nondestructive Testing); Bruche, D. (Fraunhofer Institute for Nondestructive Testing); Schneider, E. (Fraunhofer Institute for Nondestructive Testing)
Publication Source
	Nondestructive Characterization of Materials VI (1994), 699-706, Graphs.$R1 ref Accession Number: 19(95):2--2-00 Plenum Publishing Corp.. 233 Spring St., New York, NY 10013, USA Conference: Sixth International Symposium on Nondestructive Characterization of Materials, Oahu, Hawaii, USA, 7-11 June 1993 ISBN: 0-306-44816-5
Document Type
	Conference Article
Country of Publication
	United States
Language
	English
Abstract
	An automated ultrasonic setup to evaluate the difference of the principal stresses along a radial trace across the rim of monoblock railroad wheels is described. Its manipulator has a size of approx35-x200x130 mm 3 and a weight of approx12 kg and is fixed to the rim by magnetic switches and a gripping level. The manipulator houses the EMAT, preamplifiers, and two servomotors to move the EMAT along the measuring trace and to turn the probe approx90 . The central part of the system is housed in a rigid and closed cabinet with integrated cooling system. It contains the ultrasonic transmitter receiver electronics, an amplifier with an automated gain control and a patented device to determine the appropriate zero crossings of two radio frequency backwall echoes needed for the ultrasonic time-of-flight measurement. A high performance counter with a temperature stabilized 500 MHz time reference and the master-central processing unit are mounted in the center part of the cabinet. Operation of the setup is discussed and technical data of the system listed.
Accession Number
	95(2):22-196