NDLI: A deterministic interfacial cyclic oxidation spalling model. part 2; algebraic approximation, descriptive parameters, and normalized universal curve

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A deterministic interfacial cyclic oxidation spalling model. part 2; algebraic approximation, descriptive parameters, and normalized universal curve

Content Provider	NASA Technical Reports Server (NTRS)
Author	Smialek, James L.
Copyright Year	2002
Description	A cyclic oxidation interfacial spalling model has been developed in Part 1. The governing equations have been simplified here by substituting a new algebraic expression for the series (Good-Smialek approximation). This produced a direct relationship between cyclic oxidation weight change and model input parameters. It also allowed for the mathematical derivation of various descriptive parameters as a function of the inputs. It is shown that the maximum in weight change varies directly with the parabolic rate constant and cycle duration and inversely with the spall fraction, all to the 1/2 power. The number of cycles to reach maximum and zero weight change vary inversely with the spall fraction, and the ratio of these cycles is exactly 1:3 for most oxides. By suitably normalizing the weight change and cycle number, it is shown that all cyclic oxidation weight change model curves can be represented by one universal expression for a given oxide scale.
File Size	1046956
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030005292
Archival Resource Key	ark:/13960/t9b61j089
Language	English
Publisher Date	2002-12-01
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Stoichiometry Approximation Algebra Independent Variables Reaction Kinetics Spalling Oxides Oxidation Mathematical Models High Temperature Normalizing Heat Treatment Atomic Weights 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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