NDLI: Cumulative fatigue damage models

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Cumulative fatigue damage models

Content Provider	NASA Technical Reports Server (NTRS)
Author	McGaw, Michael A.
Copyright Year	1988
Description	The problem of calculating expected component life under fatigue loading conditions is complicated by the fact that component loading histories contain, in many cases, cyclic loads of widely varying amplitudes. In such a case a cumulative damage model is required, in addition to a fatigue damage criterion, or life relationship, in order to compute the expected fatigue life. The traditional cumulative damage model used in design is the linear damage rule. This model, while being simple to use, can yield grossly unconservative results under certain loading conditions. Research at the NASA Lewis Research Center has led to the development of a nonlinear cumulative damage model, named the double damage curve approach (DDCA), that has greatly improved predictive capability. This model, which considers the life (or loading) level dependence of damage evolution, was applied successfully to two polycrystalline materials, 316 stainless steel and Haynes 188. The cumulative fatigue behavior of the PWA 1480 single-crystal material is currently being measured to determine the applicability of the DDCA for this material.
File Size	1961761
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880013038
Archival Resource Key	ark:/13960/t6f23vc0k
Language	English
Publisher Date	1988-05-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Component Reliability Damage Assessment Life Durability Fatigue Materials Mathematical Models Prediction Analysis Techniques Stainless Steels Loads Forces 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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