NASA TECHNICAL NASA TM X-72005 MEMORANDUM COPY NO. CD C) (NASA-TM-X-72005) A FINITE ELEMENT N74-32353 ANALYSIS OF FATIGUE CRACK CLOSURE (14ASA) 34 p HC $3.25 CSCL 20K Unclas G3/32 47743 A FINITE-ELEMENT ANALYSIS OF FATIGUE CRACK CLOSURE by J. C. Newman, Jr. Langley Research Center Hampton, Virginia 23665 Technical Paper presented at the Eighth National Symposium on Fracture Mechanics, Providence, Rhode Island, August 26-28, 1974. This informal documentation medium is used to provide accelerated or special release of technical information to selected users. The contents may not meet NASA formal editing and publication standards, may be re- vised, or may be incorporated in another publication. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION LANGLEY RESEARCH CENTER, HAMPTON, VIRGINIA 23665