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Slow strain rate tensile tests on notched specimens of copper
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (ENHETEN EGENSKAPER)
KTH, School of Industrial Engineering and Management (ITM). (ENHETEN EGENSKAPER)ORCID iD: 0000-0002-8494-3983
2016 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 663, p. 108-115Article in journal (Other academic) Published
Resource type
Text
Abstract [en]

In this study, slow strain rate tensile tests have been performed on phosphorus alloyed copper under uniaxial and multiaxial stress states at 75 and 125 °C with two strain rates 10-6 and 10-7 s-1. Multiaxial stress states have been introduced by incorporating three different notch geometries on the uniaxial specimens. It has shown that the presence of the notches decreased the strength and ductility of copper. Ductility exhaustion was likely to be the dominant rupture mechanism. Finite element analysis was conducted to compare with the experimental results with a physically based model for stress strain flow curves without fitting parameters. The model could successfully describe the experimental data, and it could predict the dependence of acuity, temperature and strain rate in the multiaxial tests.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 663, p. 108-115
Keywords [en]
Copper, Finite element method, Multiaxial stress state, Notched specimen, Slow strain rate tensile test, Curve fitting, Ductility, Stress-strain curves, Tensile testing, Ductility exhaustion, Fitting parameters, Notched specimens, Physically based modeling, Rupture mechanism, Strength and ductilities, Strain rate
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186988DOI: 10.1016/j.msea.2016.03.111ISI: 000375499500014Scopus ID: 2-s2.0-84961999795OAI: oai:DiVA.org:kth-186988DiVA, id: diva2:930553
Note

QC 20160524

Available from: 2016-05-24 Created: 2016-05-16 Last updated: 2018-05-16Bibliographically approved
In thesis
1. Fundamental models and testing of creep in copper
Open this publication in new window or tab >>Fundamental models and testing of creep in copper
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Many sustainable technologies for energy production, for example, generation IV nuclear system, demand the use of materials operating at elevated temperatures for long duration of up to 60 years. Requirements that are even more stringent are found for creep exposed copper canisters for disposal of spent nuclear waste. The canisters should stay intact for thousands of years. Traditional design procedures that involve empirical extrapolation of creep data are no longer reliable for such extended times. Instead physically based material models have to be used.

The final stage of creep before rupture, tertiary creep has been handled with empirical methods with adjustable parameters in the past, which makes it difficult to safely identify the controlling mechanisms. A physically based model has been developed for copper taking the substructure, cavitation and necking into account.

To improve the understanding of the important contribution from particles to the creep strength an earlier formulated model has analyzed and further developed. The model has successfully been able to describe the temperature and stress dependence of precipitation hardening for copper-cobalt alloys, where this contribution totally dominates the creep strength.

Multiaxial stress states are crucial for practically all high temperature applications. Fundamental material models have been extended for such conditions. These models have been compared with strain and stress controlled tests for notched specimens that have been performed.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 149
Series
TRITA-ITM-AVL ; 2018:25
Keywords
Copper; Creep tests; Multiaxial stress state; Finite element method; Basic modelling; Tertiary creep; Precipitation hardening
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-227968 (URN)978-91-7729-773-4 (ISBN)
Public defence
2018-06-12, Kollegiesalen, Brinellvägen 8, floor 4, stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2018-05-17 Created: 2018-05-15 Last updated: 2018-05-17Bibliographically approved

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Sandström, Rolf

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