NDLI: Environmental fatigue in aluminum-lithium alloys

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Environmental fatigue in aluminum-lithium alloys

Content Provider	NASA Technical Reports Server (NTRS)
Author	Piascik, Robert S.
Copyright Year	1992
Description	Aluminum-lithium alloys exhibit similar environmental fatigue crack growth characteristics compared to conventional 2000 series alloys and are more resistant to environmental fatigue compared to 7000 series alloys. The superior fatigue crack growth behavior of Al-Li alloys 2090, 2091, 8090, and 8091 is due to crack closure caused by tortuous crack path morphology and crack surface corrosion products. At high R and reduced closure, chemical environment effects are pronounced resulting in accelerated near threshold da/dN. The beneficial effects of crack closure are minimized for small cracks resulting in rapid growth rates. Limited data suggest that the 'chemically small crack' effect, observed in other alloy system, is not pronounced in Al-Li alloys. Modeling of environmental fatigue in Al-Li-Cu alloys related accelerated fatigue crack growth in moist air and salt water to hydrogen embrittlement.
File Size	1026926
Page Count	28
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920023179
Archival Resource Key	ark:/13960/t5gb70z05
Language	English
Publisher Date	1992-07-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Metal Fatigue Aluminum-lithium Alloys Water Vapor Crack Closure Salinity Crack Propagation Corrosion Crack Geometry Copper Alloys Fatigue Materials Morphology Environment Effects Hydrogen Embrittlement 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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