_STP_668-1981.pdf

ELASTIC-PLASTIC FRACTURE#A symposium sponsored by ASTM Committee E-24 on Fracture Testing of Metals AMERICAN SOCIETY FOR TESTING AND MATERIALS Atlanta,Ga.,16-18 Nov.1977 ASTM SPECIAL TECHNICAL PUBLICATION 668 J.D.Landes,Westinghouse R&D Center J.A.Begley,The Ohio State University G.A.Clarke,Westinghouse R&D Center editors 04-668000-30 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race Street,Philadelphia,Pa.19103 Copyright by AMERICAN SOCIETY FOR TESTING AND MATERIALS 1979 Library of Congress Catalog Card Number:78-72514 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Tallahassee,Fla.October 1972 Second Printing,July 1981 Baltimore,Md.Ken Lynn Dedication It was with great sorrow and disbelief that we all learned of the sudden and untimely death of Ken Lynn during the summer of 1978.We have lost an imaginative and competent practitioner of the art of fracture mechanics who was able to cut through the many details of a problem and get to the essence of it to seek the practical solution.We have also lost a great friend who was intensely interested in the lives and achievements of his co-workers and contemporaries.It is with sincere appreciation for his fruitful technical life and his uplifting personal outreach that we dedicate this ASTM fracture mechanics symposium volume to his memory.Ken grew up near Pittsburgh and in Florida;he received his B.S.in Mechanical Engineering in 1946 and M.S.in Engineering Me-chanics in 1947 from Pennsylvania State University.His first employ-ment was with the U.S.Steel Corporation,both in Kearny,New Jersey,and in Cleveland,Ohio,where he worked on brittle crack initiation and propagation in steelsa subject to which he would devote much of his efforts later in life.He was always proud of the fact that,while at U.S.Steel,he had established the strength of the cables which still support the original Delaware Memorial Bridge.In March of 1955,he joined the Lockheed Aircraft Corporation,and was employed at both the Burbank,California,and Marietta,Georgia,facilities.As a senior research engineer,he was in charge of struc-tural materials research on the nuclear-powered bomber project as well as fatigue life prediction of aircraft wing structures.In August of 1957,he moved to the Rocketdyne Division of North American Rock-well Corporation in Canoga Park,California,where he began his serious development as a practitioner of fracture mechanics.Through a series of increasingly challenging assignments in experimental stress analysis and fracture mechanics evaluations,he became a lead con-sultant on structural problems and fracture mechanics for Rocketdyne hardware.A key responsibility of Kens was for development of the fracture control plan for several critical Rocketdyne structures.It was at Rocketdyne that Ken became actively involved with ASTM,and with Committee E-24 in particular.He quickly recognized the con-sensus agreement value of the ASTM system and strongly promoted it.Kens approach to ASTM was not to seek leadership,but rather to stay down in the trenches at the technical working level.He main-tained this philosophy throughout his association with ASTM,especially in later years as he came to rely on ASTM E-24 more and more for consensus agreement.Ken next became intrigued by the technical challenges presented by the field of nuclear power generation.So,in January of 1971,he joined the Westinghouse PWR Division where he became deeply involved in applying advanced fracture mechanics techniques to the analysis of pressurized water com-ponents,mainly reactor pressure vessels.Because the nuclear industry was then in the process of upgrading safety analysis in terms of fracture mechanics,he eagerly helped promote the standardization of LEFM testing and analysis through ASTM.His Westinghouse ex-perience led him to join the Atomic Energy Commission in August of 1972.At AEC he worked on applying fracture mechanics to thermal shock analysis problems and to flaw evaluation procedures which later were incorporated into the ASME Boiler and Pressure Vessel Code,Section XI.Recognizing greater opportunity for development and application of fracture mechanics.Ken joined the Division of Reactor Safety Researchnow part of the Nuclear Regulatory Commissionwhereupon he took over management of a series of research programs all directed at ensuring the safety of structures in the primary system of light water power reactors.Full of energy.Ken made many contributions to the understanding and application of fracture mechanics principles for the evaluation and solution of problems faced in primary system integrity.Included among these were thermal shock,crack arrest,crack growth rates,irradiation effects,and linear elastic and elastic-plastic analysis of vessels under overpressurization.With NRC,Ken undertook a front-line leadership of grounding technical advancements in fracture mechanics through ASTM Standards.His commitment to the