NDLI: An experimental comparison of several current viscoplastic constitutive models at elevated temperature

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An experimental comparison of several current viscoplastic constitutive models at elevated temperature

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	Four current viscoplastic models are compared experimentally for Inconel 718 at 593 C. This material system responds with apparent negative strain rate sensitivity, undergoes cyclic work softening, and is susceptible to low cycle fatigue. A series of tests were performed to create a data base from which to evaluate material constants. A method to evaluate the constants is developed which draws on common assumptions for this type of material, recent advances by other researchers, and iterative techniques. A complex history test, not used in calculating the constants, is then used to compare the predictive capabilities of the models. The combination of exponentially based inelastic strain rate equations and dynamic recovery is shown to model this material system with the greatest success. The method of constant calculation developed was successfully applied to the complex material response encountered. Backstress measuring tests were found to be invaluable and to warrant further development.
File Size	1393638
Page Count	37
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19880012132
Archival Resource Key	ark:/13960/t1sf7nw77
Language	English
Publisher Date	1988-04-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Work Softening Cyclic Loads Tensile Tests Viscoplasticity High Temperature Tests Mathematical Models Creep Tests Constitutive Equations Inconel Trademark Strain Rate 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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