DYMAT 2009
Volume 2, 2009
DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 1367 - 1373
Section Constitutive Modeling
Published online 15 September 2009
DYMAT 2009 (2009) 1367-1373
DOI: 10.1051/dymat/2009193

Thermo-mechanical model identification of a strengthened copper with an inverse method

M. Peroni1, L. Peroni1 and A. Dallocchio2

1  Department of Mechanics, Politecnico di Torino – Duca degli Abruzzi 24, 10129 Torino, Italy
2  Engineering Department – Mechanical and Materials Engineering Group, CERN (European Organization for Nuclear Research), 1211 Geneva 23, Switzerland

Published online: 15 September 2009

This paper describes a numerical inverse method to extract material strength parameters from the experimental data obtained via mechanical tests at different strain-rates. It will be shown that this procedure is particularly useful to analyse experimental results when the stress-strain fields in the specimen cannot be correctly described via analytical models. This commonly happens in specimens with no regular shape, in specimens with a regular shape when some instability phenomena occur (for example the necking phenomena in tensile tests that create a strongly heterogeneous stress-strain fields) or in dynamic tests (where the strain-rate field is not constant due to wave propagation phenomena). Furthermore the developed procedure is useful to take into account thermal phenomena generally affecting high strain-rate tests due to the adiabatic overheating related to the conversion of plastic work.

© EDP Sciences 2009