_STP_463-1970.pdf

REVIEW OF DEVELOPMENTS IN PLANE STRAIN FRACTURE TOUGHNESS TESTING W.F.Brown,Jr.,editor ASTM SPECIAL TECHNICAL PUBLICATION 463 List price$18.25 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1 916 Race Street,Philadelphia,Pa.1 9103 NATIONAL AERONAUTICS AND SPACE ADMINISTRATION Copyright by ASTM Intl(all rights reserved);Mon Dec 7 13:19:19 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.()BY AMERICAN SOCIETY FOR TESTING AND MATERIALS 1970 Library of Congress Catalog Card Number:72-97728 ISBN 0-8031-0058-2 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in LutherviUe-Timonium,Md.September 1970 Copyright by ASTM Intl(all rights reserved);Mon Dec 7 13:19:19 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Foreword The object of this book is to bring together a series of papers which de-scribe recent experience obtained in the United States and in England with the application of the ASTM E-24 Proposed Method of Test for Plane Strain Fracture Toughness of Metallic Materials.This information supplements that which has appeared in ASTM STP 381 on Fracture Toughness Testing and its Application and in STP 410 on Plane Strain Crack Toughness Testing of High Strength Metallic Materials.This publication is a cooperative effort of ASTM and NASA.NASA research personnel have participated in ASTM Fracture Committee activities since their inception in 1959.This participation reflects the strong interest that NASA has maintained in the development of test methods for evaluation of the fracture resistance of engineering materials.This interest arises from the necessity for the use of high-strength alloys in critical parts of aerospace structures.By cooperation with ASTM in publication of this book NASA is helping to fulfill its obligation to provide the widest practicable and appropriate dissemination of results from its activities.George C.Deutsch Assistant Director for Materials Sciences and Engineering,NASA Headquarters,Washington,D.C.Copyright by ASTM Intl(all rights reserved);Mon Dec 7 13:19:19 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Related ASTM Publications Fracture Toughness Testing and Its Applications,STP 381(T965),$19.50 Plane Strain Crack Toughness Testing of High Strength Metallic Materials,STP 410(1967),$5.50 Electron Fractography,STP 436(1968),$11.00 Copyright by ASTM Intl(all rights reserved);Mon Dec 7 13:19:19 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Contents PAGE Introduction to STP 463-w.F.BROWN,JR.1 Progress in Fracture Testing of Metallic Materials-J.G.KAUEMAN.3 Theory.4 Initial Recommendations.4 Thickness as a Problem.7 Fatigue Cracking.8 Emphasis on Thick Sections.9 Evolution of Notched Bend Specimens.12 Compact Kc Specimen.15 Screening Tests.15 Thin-Section Problem.18 Medium-Strength Materials.18 Cautionary Notes.18 Summary.20 Evaluation of a Method of Test for Plane Strain Fracture Toughness Testing Using a Bend Specimen-R.H.HEYER AND D.E.MC CABE.22 Pilot Program.23 Interlaboratory Tests.23 Fatigue Cracking.24 Bend Testing.30 Analysis of Kc Data.33 Conclusions.40 British Experience with Plane Strain Fracture Toughness(KIt)Testing-M.J.MAY.42 Collaborative Test Program.43 First Stage.43 Second Stage.44 Standardization of KIc Testing.47 Influence of Fatigue Precracking Conditions.47 Crack Length-Specimen Thickness Requirements.51 Draft British Standard.61 Summary.61 Discussion.62 The Influence of Crack Length and Thickness in Plane Strain Fracture Tough-ness Tests-M.H.JONES AND W.F.BROWN,JR.63 Material and Specimen Preparation.66 Test Procedure.67 Analysis of Data.68 Bend Specimens.68 Smooth Specimens.71 Results for Effects of Thickness and Crack Length.72 Screening Tests for Kc.77 Correlation of Kc with Tensile Properties.84 Practical Significance of Results.85 Appendixes.88 Discussion.92 Copyright by ASTM Intl(all rights reserved);Mon Dec 7 13:19:19 EST 2015Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.vi CONTENTS PAGE Crack Toughness Testing of High-Strength Steels-E,A.STEIGERWALD.102 Notch Bend Tests.107 Km Data for High-Strength Steels.113 Summary and Conclusions.115 Discussion.121 Slow Bend Kc Testing of Medium-Strength High-Toughness Steels-s.T.ROLFE AND S.R,NOVAK.124 Materials and Procedure.t25 Specimen Geometry and Analysis.128 Results and Discussion.131 Kio Values.131 Pop-in Criteria.133 Specimen Size Requirements.139 Effects of Stress Level During Fatigue Cracking.144 Effect of Face Notching.145 Correlation Between Krc and CVN Values.145 Summary and