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Effects of state recovery on creep buckling under variable loadingStructural alloys embody internal mechanisms that allow recovery of state with varying stress and elevated temperature, i.e., they can return to a softer state following periods of hardening. Such material behavior is known to strongly influence structural response under some important thermomechanical loadings, for example, that involving thermal ratchetting. The influence of dynamic and thermal recovery on the creep buckling of a column under variable loading is investigated. The column is taken as the idealized (Shanley) sandwich column. The constitutive model, unlike the commonly employed Norton creep model, incorporates a representation of both dynamic and thermal (state) recovery. The material parameters of the constitutive model are chosen to characterize Narloy Z, a representative copper alloy used in thrust nozzle liners of reusable rocket engines. Variable loading histories include rapid cyclic unloading/reloading sequences and intermittent reductions of load for extended periods of time; these are superimposed on a constant load. The calculated results show that state recovery significantly affects creep buckling under variable loading. Structural alloys embody internal mechanisms that allow recovery of state with varying stress and time.
Document ID
19860015839
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Robinson, D. N.
(Akron Univ. Akron, OH, United States)
Arnold, S. M.
(Akron Univ. Akron, OH, United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1986
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:175094
NASA-CR-175094
Accession Number
86N25310
Funding Number(s)
PROJECT: RTOP 505-60-12
CONTRACT_GRANT: NAG3-379
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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