Post necking characterisation for sheet metal materials using full field measurement

Document identifier: oai:DiVA.org:ltu-7653
Access full text here:10.1016/j.jmatprotec.2016.07.036
Keyword: Engineering and Technology, Mechanical Engineering, Applied Mechanics, Teknik och teknologier, Maskinteknik, Teknisk mekanik, Hållfasthetslära, Solid Mechanics
Publication year: 2016
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Abstract:

precise prediction of the post-necking behaviour of materials is needed to increase the precision of computer simulations with large deformations. Applications in which this need is encountered include crash, forming, and failure simulations. By using an optical full-field measurement of the localised deformation field, an effective and computationally fast method is presented to determine the relationship between true stress and true plastic strain, including post-necking behaviour. The presented stepwise modelling method is used to characterise heat-treated boron steel using thin sheet metal specimens. These results are validated with the results determined by a method based on inverse modelling. It can be concluded that the stepwise modelling method is considerably faster than the compared inverse modelling method. The method is also suitable for effectively determining element size dependency due to regularisation of the hardening behaviour needed for finite element analysis with strain localisation, e.g., for crash simulations

Authors

Stefan Marth

Luleå tekniska universitet; Material- och solidmekanik
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Hans-åke Häggblad

Luleå tekniska universitet; Material- och solidmekanik
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Mats Oldenburg

Luleå tekniska universitet; Material- och solidmekanik
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Rickard Östlund

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