NDLI: An automated procedure for material parameter evaluation for viscoplastic constitutive models

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An automated procedure for material parameter evaluation for viscoplastic constitutive models

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hill, P. S. Imbrie, P. K. Haisler, W. E. Allen, D. H. James, G. H.
Copyright Year	1988
Description	An automated procedure is presented for evaluating the material parameters in Walker's exponential viscoplastic constitutive model for metals at elevated temperature. Both physical and numerical approximations are utilized to compute the constants for Inconel 718 at 1100 F. When intermediate results are carefully scrutinized and engineering judgement applied, parameters may be computed which yield stress output histories that are in agreement with experimental results. A qualitative assessment of the theta-plot method for predicting the limiting value of stress is also presented. The procedure may also be used as a basis to develop evaluation schemes for other viscoplastic constitutive theories of this type.
File Size	826463
Page Count	36
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880012136
Archival Resource Key	ark:/13960/t6n061q4c
Language	English
Publisher Date	1988-04-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Stresses Approximation Temperature Effects Viscoplasticity Yield Strength Mathematical Models High Temperature Parameter Identification Constitutive Equations Inconel Trademark 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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