NDLI: Probabilistic mesomechanical fatigue model

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Probabilistic mesomechanical fatigue model

Content Provider	NASA Technical Reports Server (NTRS)
Author	Tryon, Robert G.
Copyright Year	1997
Description	A probabilistic mesomechanical fatigue life model is proposed to link the microstructural material heterogeneities to the statistical scatter in the macrostructural response. The macrostructure is modeled as an ensemble of microelements. Cracks nucleation within the microelements and grow from the microelements to final fracture. Variations of the microelement properties are defined using statistical parameters. A micromechanical slip band decohesion model is used to determine the crack nucleation life and size. A crack tip opening displacement model is used to determine the small crack growth life and size. Paris law is used to determine the long crack growth life. The models are combined in a Monte Carlo simulation to determine the statistical distribution of total fatigue life for the macrostructure. The modeled response is compared to trends in experimental observations from the literature.
File Size	3451464
Page Count	110
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970016840
Archival Resource Key	ark:/13960/t3324w20d
Language	English
Publisher Date	1997-04-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Fatigue Life Crack Tips Nucleation Cyclic Loads Monte Carlo Method Crack Propagation Crack Opening Displacement Heterogeneity Edge Dislocations Crack Geometry Statistical Distributions Mathematical Models Microstructure Fracturing 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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