_STP_714-1980.pdf

EFFECT OF LOAD SPECTRUM VARIABLES ON FATIGUE CRACK INITIATION AND PROPAGATION A symposium sponsored by ASTM Committee E-9 on Fatigue AMERICAN SOCIETY FOR TESTING AND MATERIALS San Francisco,Calif.,21 May 1979 ASTM SPECIAL TECHNICAL PUBLICATION 714 D.F.Bryan,The Boeing Wichita Co.,and J.M.Potter,Air Force Flight Dynamics Laboratory,editors 04-714000-30#AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race Street,Philadelphia,Pa.19103 Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Copyright by AMERICAN SOCIETY FOR TESTING AND MATERIALS 1980 Library of Congress Catalog Card Number:80-66078 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Baltimore,Md.October 1980 Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Foreword The symposium on Effect of Load Spectrum Variables on Fatigue Crack Initiation and Propagation was presented at San Francisco,Calif.,21 May 1979.The symposium was sponsored by the American Society for Testing and Materials through its Committee E-9 on Fatigue.D.F.Bryan,The Boe-ing Wichita Co.,and J.M.Potter,Air Force Flight Dynamics Laboratory,presided as symposium chairmen and editors of this publication.Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Related ASTM Publications Part-Through Crack Fatigue Life Predictions,STP 687(1979),$26.65,04-687000-30 Service Fatigue Loads Monitoring,Simulation,and Analysis,STP 671(1979),$29.50,04-671000-30 Fatigue Crack Growth under Spectrum Loads,STP 595(1976),$34.50,04-595000-30 Manual on Statistical Planning and Analysis for Fatigue Experiments,STP 588(1975),$15.00,04-588000-30 Handbook of Fatigue Testing,STP 566(1974),$17.25,04-566000-30 Damage Tolerance in Aircraft Structures,STP 486(1971),$19.50,04-486000-30 Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.A Note of Appreciation to Reviewers This publication is made possible by the authors and,also,the unheralded efforts of the reviewers.This body of technical experts whose dedication,sacrifice of time and effort,and collective wisdom in reviewing the papers must be acknowledged.The quality level of ASTM publications is a direct function of their respected opinions.On behalf of ASTM we acknowledge with appreciation their contribution.ASTM Committee on Publications Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Editorial Staff Jane B.Wheeler,Managing Editor Helen M.Hoersch,Associate Editor Helen Mahy,Senior Assistant Editor Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Contents Introduction 1 Effect of Spectrum Editing on Fatigue Crack Initiation and Propaga-tion in a Notclied Menit)erD.F.SOCIE AND P.I.ARTWOHL 3 Discussion 23 Time Dependent Clianges in Notcli Stress/Notcli Strain and Tlieir Effects on Crack Initiationj.R.CARROLL,JR.24 Ranking 7XXX Aluminum Alloy Fatigue Crack Growth Resistance Under Constant Amplitude and Spectrum Loading R.J.BUCCI,A.B.THAKKER,T.H.SANDERS,R.R.SAWTELL,AND J.T.STALEY 41 Effects of Compressive Loads on Spectrum Fatigue Crack Growth RateT.M.HSU AND W.M.MCGEE 79 Observation of Crack Retardation Resulting from Load Sequencing Characteristic of Military Gas Turbine Operation J.M.LARSEN AND C.G.ANNIS,JR.91 Effects of Gas Turbine Engine Load Spectrum Variables on Crack PropagationD.E.MACHA,A.F.GRANDT,JR.,AND B.J.WICKS 108 An Engineering Model for Assessing Load Sequencing Effects I.T.WOZUMI,T.SPAMER,AND G.E.LAMBERT 128 Effect of Transport Aircraft Wing Loads Spectrum Variation on Crack Growthp.R.ABELKIS 143 Effect of Gust Load Alleviation on Fatigue and Crack Growth in ALCLAD 2024-T3J.B.DE IONGE AND A.NEDERVEEN 170 Prediction Model for Fatigue Crack Growth in Windmill Structures R.W.FINGER 185 Discussion 199 Copyright by ASTM Intl(all rights reserved);Sun Dec 27 13:33:51 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Effects of Fighter Attack Spectrum on Crack GrowthH.D.DILL,C.R.SAFF,AND J.M.POTTER 205 Evaluating Spectrum Effects in U.S.Air Force Attack/Fighter/Trai