NDLI: Experimental evaluation of fatigue crack initiation from corroded hemispherical notches in aerospace structural materials

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Experimental evaluation of fatigue crack initiation from corroded hemispherical notches in aerospace structural materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Forman, Royce Shindo, David Garcia, Daniel B.
Copyright Year	2010
Description	A test program was developed and executed to evaluate the influence of corroded hemispherical notches on the fatigue crack initiation and propagation in aluminum 7075-T7351, 4340 steel, and D6AC steel. Surface enhancements such as shot peening and laser shock peening were also incorporated as part of the test effort with the intent of improving fatigue performance. In addition to the testing, fracture mechanics and endurance limit based analysis methods were evaluated to characterize the results with the objective of challenging typical assumptions used in modeling fatigue cracks from corrosion pits. The results specifically demonstrate that the aluminum and steel alloys behave differently with respect to fatigue crack initiation from hemispherical corrosion pits. The aluminum test results were bounded by the fracture mechanics and endurance limit models while exhibiting a general insensitivity to the residual stress field generated by shot peening. The steel specimens were better characterized by the endurance limit fatigue properties and did exhibit sensitivities to residual stresses from the shot peening and laser shock peening
File Size	2665661
Page Count	27
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20100027429
Archival Resource Key	ark:/13960/t0sr3vp1f
Language	English
Publisher Date	2010-01-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Fracture Mechanics Corrosion Fatigue Materials Notches Aircraft Construction Materials Aluminum Alloys Peening Steels Residual Stress Spacecraft Construction Materials Crack Initiation Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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