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On the variation in crack-opening stresses at different locations in a three-dimensional bodyCrack propagation and closure behavior of thin, and thick middle crack tension specimens under constant amplitude loading were investigated using a three dimensional elastic plastic finite element analysis of fatigue crack propagation and closure. In the thin specimens the crack front closed first on the exterior (free) surface and closed last in the interior during the unloading portion of cyclic loading; a load reduced displacement technique was used to determine crack opening stresses at specified locations in the plate from the displacements calculated after the seven cycle. All the locations were on the plate external surface and were located near the crack tip, behind the crack tip, at the centerline of the crack. With this technique, the opening stresses at the specified points were found to be 0.52, 0.42, and 0.39 times the maximum applied stress.
Document ID
19910004455
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chermahini, R. G.
(Aeronautical Research Inst. of Sweden Stockholm., United States)
Blom, Anders F.
(Aeronautical Research Inst. of Sweden Stockholm., United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1990
Subject Category
Structural Mechanics
Report/Patent Number
NASA-CR-187722
FFA-TN-1988-21
NAS 1.26:187722
Accession Number
91N13768
Funding Number(s)
CONTRACT_GRANT: NAG1-529
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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