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The role of creep in stress strain curves for copper
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2012 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 422, p. 51-Article in journal (Refereed)
Abstract [en]

A model for plastic deformation in pure copper taking work hardening, dynamic recovery and static recovery into account, has been formulated using basic dislocation mechanisms. The model is intended to be used in finite-element computations of the long term behaviour of structures in Cu-OFP for storage of nuclear waste. The relation between the strain rate and the maximum flow stress in the model has been demonstrated to correspond to strain rate versus stress in creep tests for oxygen free copper alloyed with phosphorus Cu-OFP. A further development of the model can also represent the primary and secondary stage of creep curves. The model is compared to stress strain curves in compression and tension for Cu-OFP. The compression tests were performed at room temperature for strain rates between 5 × 10 -5 and 5 × 10 -3 s -1. The tests in tension covered the temperature range 20-175°C for strain rates between 1 × 10 -7 and 1 × 10 -4 s -1. Consequently, it is demonstrated that the model can represent mechanical test data that have been generated both at constant load and at constant strain rate without the use of any fitting parameters. © 2011 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 422, p. 51-
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12840DOI: 10.1016/j.jnucmat.2011.12.012Scopus ID: 2-s2.0-84855794727OAI: oai:DiVA.org:ri-12840DiVA, id: diva2:973033
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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