A study of localisation in dual-phase high-strength steels under dynamic loading using digital image correlation and FE analysis

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dc.creatorTarigopula, V.
dc.creatorHopperstad, O. S.
dc.creatorLangseth, M.
dc.creatorClausen, A. H.
dc.creatorHild, François
dc.date2007-12-23
dc.date.accessioned2026-07-07T08:51:11Z
dc.date.available2026-07-07T08:51:11Z
dc.descriptionTensile tests were conducted on dual-phase high-strength steel in a Split-Hopkinson Tension Bar at a strain-rate in the range of 150-600/s and in a servo-hydraulic testing machine at a strain-rate between 10-3 and 100/s. A novel specimen design was utilized for the Hopkinson bar tests of this sheet material. Digital image correlation was used together with high-speed photography to study strain localisation in the tensile specimens at high rates of strain. By using digital image correlation, it is possible to obtain in-plane displacement and strain fields during non-uniform deformation of the gauge section, and accordingly the strains associated with diffuse and localised necking may be determined. The full-field measurements in high strain-rate tests reveal that strain localisation started even before the maximum load was attained in the specimen. An elasto-viscoplastic constitutive model is used to predict the observed stress-strain behaviour and strain localisation for the dual-phase steel. Numerical simulations of dynamic tensile tests were performed using the non-linear explicit FE code LS-DYNA. Simulations were done with shell (plane stress) and brick elements. Good correlation between experiments and numerical predictions was achieved, in terms of engineering stress-strain behaviour, deformed geometry and strain fields. However, mesh density plays a role in the localisation of deformation in numerical simulations, particularly for the shell element analysis.
dc.identifierhttps://arxiv.org/abs/0712.3921
dc.identifierhttp://arxiv.org/abs/0712.3921
dc.identifierInternational Journal of Solids and Structures 45 (2008) 601-619
dc.identifierdoi:10.1016/j.ijsolstr.2007.08.021
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144847
dc.subjectMaterials Science
dc.titleA study of localisation in dual-phase high-strength steels under dynamic loading using digital image correlation and FE analysis
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