NDLI: Consolidation of fatigue and fatigue-crack-propagation data for design use

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Consolidation of fatigue and fatigue-crack-propagation data for design use

Content Provider	NASA Technical Reports Server (NTRS)
Author	Davies, K. B. Rice, R. C. Jaske, C. E. Feddersen, C. E.
Copyright Year	1975
Description	Analytical methods developed for consolidation of fatigue and fatigue-crack-propagation data for use in design of metallic aerospace structural components are evaluated. A comprehensive file of data on 2024 and 7075 aluminums, Ti-6Al-4V alloy, and 300M steel was established by obtaining information from both published literature and reports furnished by aerospace companies. Analyses are restricted to information obtained from constant-amplitude load or strain cycling of specimens in air at room temperature. Both fatigue and fatigue-crack-propagation data are analyzed on a statistical basis using a least-squares regression approach. For fatigue, an equivalent strain parameter is used to account for mean stress or stress ratio effects and is treated as the independent variable; cyclic fatigue life is considered to be the dependent variable. An effective stress-intensity factor is used to account for the effect of load ratio on fatigue-crack-propagation and treated as the independent variable. In this latter case, crack-growth rate is considered to be the dependent variable. A two term power function is used to relate equivalent strain to fatigue life, and an arc-hyperbolic-tangent function is used to relate effective stress intensity to crack-growth rate.
File Size	2472142
Page Count	78
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750024434
Archival Resource Key	ark:/13960/t49p7tm07
Language	English
Publisher Date	1975-10-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Titanium Alloys Fatigue Life Structural Members Aluminum Alloys Regression Analysis Aircraft Structures 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	Technical Report

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