NDLI: Stochastic modeling of crack initiation and short-crack growth under creep and creep-fatigue conditions

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Stochastic modeling of crack initiation and short-crack growth under creep and creep-fatigue conditions

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ghosn, Louis J. Ohtani, Ryuichi Kitamura, Takayuki
Copyright Year	1989
Description	A simplified stochastic model is proposed for crack initiation and short-crack growth under creep and creep-fatigue conditions. Material inhomogeneity provides the random nature of crack initiation and early growth. In the model, the influence of microstructure is introduced by the variability of: (1) damage accumulation along grain boundaries, (2) critical damage required for crack initiation or growth, and (3) the grain-boundary length. The probabilities of crack initiation and growth are derived by using convolution integrals. The model is calibrated and used to predict the crack density and crack-growth rate of short cracks of 304 stainless steel under creep and creep-fatigue conditions. The mean-crack initiation lives are predicted to be within an average deviation of about 10 percent from the experimental results. The predicted cumulative distributions of crack-growth rate follow the experimental data closely. The applicability of the simplified stochastic model is discussed and the future research direction is outlined.
File Size	896901
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890007915
Archival Resource Key	ark:/13960/t0cv9dg4d
Language	English
Publisher Date	1989-01-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Grain Boundaries Fatigue Life Stochastic Processes Predictions Models Creep Strength Microstructure Stainless Steels Crack Initiation Creep Analysis 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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