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Some effects of experimental error in fracture testingEffects of experimental imprecision on the stress intensity factors calculated for various practical specimen types are shown. A general form equation for the stress intensity factor is presented and a general error equation is derived. The expected error in the stress intensity factor is given in terms of the precision levels of the basic experimental measurements and derivatives of the stress intensity calibration factor. Nine common fracture specimen types are considered, and the sensitivity of the various types to experimental error is illustrated. Some implications for fracture toughness testing and crack growth rate testing are discussed and methods of analysis are proposed to compensate for the effects of experimental error.
Document ID
19730021209
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Orange, T. W. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
January 1, 1973
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TM-X-68285
E-7621
Report Number: NASA-TM-X-68285
Report Number: E-7621
Meeting Information
Meeting: Natl. Symp. on Fracture Mech.
Location: College Park, MD
Country: United States
Start Date: August 27, 1973
End Date: August 29, 1973
Sponsors: Am. Soc. for Testing and Mater.
Accession Number
73N29941
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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