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R-Curve Instability Calculations Of Crack GrowthReport discusses use of instability method of calculation and R-curve mathematical models to analyze growth of cracks in fracture-mechanics specimens. In case of single material and structure, such analysis sometimes simple enough to be done on pocket calculator. Where microcomputer or larger computer available, comprehensive program includes libraries of driving-force equations for various configurations and R-curve mathematical models for different materials. Author concludes instability method simple and effective and model equations studied all viable in sense at lease one of them should fit almost any applicable set of crack-growth data. Method and models constitute powerful mathematical tools for analysis of fractures.
Document ID
19890000526
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Orange, Thomas W.
(NASA Lewis Research Center, Cleveland, OH.)
Date Acquired
August 14, 2013
Publication Date
October 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 10
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
LEW-14841
Accession Number
89B10526
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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