1、MONITORING STRUCTURAL INTEGRITY BY ACOUSTIC EMISSION A symposium presented at Ft.Lauderdale,Fla.,17-18 Jan.1974 AMERICAN SOCIETY FOR TESTING AND MATERIALS ASTM SPECIAL TECHNICAL PUBLICATION 571 J.C.Spanner,editor J.W.McEIroy,co-editor List price$23.75 04-571000-22 AMERICAN SOCIETY FOR TESTING AND MA
2、TERIALS 1916 Race Street,Philadelphia,Pa.19103?9 by AMERICAN SOCIETY FOR TESTING AND MATERIALS 1975 Library of Congress Catalog Card Number:74-28978 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Baltimore,Md.March 1975 Foreword
3、The symposium on Monitoring Structural Integrity by Acoustic Emis-sion was presented in Ft.Lauderdale,Fla.,17-18 Jan.1974.The symposium was sponsored by Committee E-7 on Nondestructuve Testing,American Society for Testing and Materials.J.C.Spanner,Westinghouse Hanford Co.,presided as symposium chair
4、man.J.W.McElroy,Philadelphia Electric Co.,presided as symposium co-chairman.Related ASTM Publications Acoustic Emission,STP 505(1972),$22.50,(04-505000-22)Contents Introduction 1 Why Acoustic Emission-Why Not?-B.H.SchofieM 3 Acoustic Emission in the Frequency Domain-L.J.Graham and G.A.Alers l 1 Acou
5、stic Emission During Phase Transformation in Steel-G.R.Speich and A.J.Schwoeble 40 Development of Acoustic Emission Testing for the Inspection of Gas Distribution Pipetines-J.W.McElroy 59 Evaluating the Stability of Geologic Structures Using Acoustic Emission-H.R.Hardy,Jr.80 Acceptance Testing Welde
6、d Ammunition Belt Links Using Acoustic Emission-P.H.Hutton 107 Industrial Use of Acoustic Emission for Nondestructive Testing-T.F.Drouillard,R.G.Liptai,and C.A.Tatro 122 Industrial Application of Acoustic Emission Analysis Technology-D.L.Parry 150 Establishing Structural Integrity Using Acoustic Emi
7、ssion-(7.F.Morais and A.T.Green 184 Acoustic Monitoring Systems to Assure Integrity of Nuclear Plants-Raj Gopal 200 Detection and Location of Flaw Growth in Metallic and Composite Structures-M.P.Kelly,D.O.Harris,and A.A.Pollock 221 Acoustic EmissionA Bibliography for 1970-1972-T.F.Drouillard 241 Gen
8、eral Index 285 STP571-EB/Mar.1975 Introduction A wide variety of nondestructive testing methods and procedures are utilized during the fabrication of structures when the consequences of failure are costly,constitute a hazard to the public,or both.In addition,a final proof test(pressure test)is appli
9、ed to most pressure vessels and many pressurized systems.The consequences of catastrophic failure dur-ing proof testing are often such that almost any method for reducing the probability of failure is economically justified.Present acoustic emission technology offers this capability and,in addition,
10、provides a viable method for evaluating the basic integrity of many other types of engineering struc-tures.Numerous successful applications of acoustic emission during proof testing of aerospace tanks,pressure vessels,and piping systems have been reported in the literature of the past 15 years.Acous
11、tic emission is the transient elastic energy that is spontaneously released when materials undergo deformation,fracture,or both.Efforts toward utilizing this phenomenon in materials research studies,and for nondestructive testing,have increased substantially in recent years.Materials investigated ha
12、ve included both metals and nonmetals,although most of the work published to date has been concerned with metallic specimens or structures.Analogous studies have been conducted on geo-logic materials(rocks,etc.),where the terms microseismic activity or rock noise are often used in lieu of the term a
13、coustic emission.The continued increase in the number of reported applications of acoustic emission to monitor structural integrity influenced ASTM to authorize this special technical publication to publish the papers presented during an ASTM Symposium on Monitoring Structural Integrity by Acoustic
14、Emission.This symposium was held in Fort Lauderdale,Florida,in January 1974,under the sponsorship of the ASTM E-7 Committee on Nondestructive Testing,and was a sequal to an introductory ASTM Symposium on Acoustic Emission which was held in December 1971.That symposium was documented in ASTM STP 505.
15、The purpose of the 1974 symposium,and of this STP,is to present a collection of papers selected to provide a representative coverage of recent activities in applying acoustic emission to monitor the integrity of engineering structures.It is significant that many of the speakers at this Copyright?9 1
16、975 by ASTM International www.astm.org 2 MONITORING STRUCTURAL INTEGRITY BY ACOUSTIC EMISSION symposium are among the leading U.S.experts in this new and rapidly expanding area of technology.The first few papers provide background information on the acoustic emission method and its applications,and discuss specific characteristics of the signals that are emitted by structural materials.The next series of papers describe the techniques that were used,and the results that were obtained,when commer