NDLI: Simulation of fatigue crack initiation at corrosion pits with edm notches

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Simulation of fatigue crack initiation at corrosion pits with edm notches

Content Provider	NASA Technical Reports Server (NTRS)
Author	Piascik, Robert S. Smith, Stephen W. Newman, John A.
Copyright Year	2003
Description	Uniaxial fatigue tests were conducted to compare the fatigue life of laboratory produced corrosion pits, similar to those observed in the shuttle main landing gear wheel bolt-hole, and an electro-discharged-machined (EDM) flaw. EDM Jaws are used to simulate corrosion pits during shuttle wheel (dynamometer) testing. The aluminum alloy, (AA 7050) laboratory fatigue tests were conducted to simulate the local stress level contained in the wheel bolt-hole. Under this high local stress condition, the EDM notch produced a fatigue life similar to test specimens containing corrosion pits of similar size. Based on the laboratory fatigue test results, the EDM Jaw (semi-circular disc shaped) produces a local stress state similar to corrosion pits and can be used to simulate a corrosion pit during the shuttle wheel dynamometer tests.
File Size	7528842
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030032270
Archival Resource Key	ark:/13960/t01024860
Language	English
Publisher Date	2003-03-01
Access Restriction	Open
Subject Keyword	Fatigue Tests Metal Fatigue Fatigue Life Stress Corrosion Corrosion Simulation Wheels Landing Gear Aluminum Alloys Dynamometers Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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