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Comparison tests and experimental compliance calibration of the proposed standard round compact plane strain fracture toughness specimenStandard round specimen fracture test results compared satisfactorily with results from standard rectangular compact specimens machined from the same material. The location of the loading pin holes was found to provide adequate strength in the load bearing region for plane strain fracture toughness testing. Excellent agreement was found between the stress intensity coefficient values obtained from compliance measurements and the analytic solution proposed for inclusion in the standard test method. Load displacement measurements were made using long armed displacement gages and hollow loading cylinders. Gage points registered on the loading hole surfaces through small holes in the walls of the loading cylinders.
Document ID
19800005258
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Fisher, D. M. (NASA Lewis Research Center Cleveland, OH, United States)
Buzzard, R. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
November 1, 1979
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TM-81379
E-284
Accession Number
80N13513
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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