Abstracts: NDT of Railway

NDTnet 1998 July, Vol.3 No.7

COMPENDEX Antwortnummer 11 - © 1998 EI
Title
	Nondestructive residual stress measurements in railroad wheels using the low-field magnetoacoustic test method.
Author
	Namkung, M. (NASA Langley Research Cent, Hampton, VA, USA); Utrata, D.
Publication Source
	Rev Prog Quant Nondestr Eval v 7B 1988 p 1429-1438 CODEN: RPQEDF ISSN: 0743-0760 ISBN: 0-306-42837-7
Publication Year
	1988
Document Type
	Journal
Treatment Code
	Application; Experimental
Language
	English
Abstract
	A low-field magnetoacoustic stress measurement technique was developed and a prototype system designed for whole railroad wheel testing.Two wheels were tested with different signs of residual stress states determined by saw cutting techniques.The test and data acquisition system consisted of an electromagnet system, acoustic instrumentation, and a control computer.The fractional frequency shifts as a function of the current applied to the electromagnets was determined.A time dependence for this shift was discovered for the closed sawcut wheel.A quantitative analysis was conducted based on magnetic aftereffect.Magnetic and microstructural behavior such as magnetostriction, carbon diffusion, and lattice displacement were assessed.18 Refs.
Accession Number
	89(3):18187