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
Other publications >>

Hans-åke Häggblad

Luleå tekniska universitet; Material- och solidmekanik
Other publications >>

Mats Oldenburg

Luleå tekniska universitet; Material- och solidmekanik
Other publications >>

Rickard Östlund

Other publications >>

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        identifier: oai:DiVA.org:ltu-7653
        datestamp: 2021-04-19T12:21:24Z
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                recordCreationDate: 2016-09-29
            identifier: 
                http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-7653
                10.1016/j.jmatprotec.2016.07.036
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            titleInfo: 
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                    lang: eng
                title: Post necking characterisation for sheet metal materials using full field measurement
            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

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                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Mechanical Engineering
                        Applied Mechanics
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                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Maskinteknik
                        Teknisk mekanik
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                        lang: swe
                        authority: ltu
                    topic: Hållfasthetslära
                    genre: Research subject
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                        lang: eng
                        authority: ltu
                    topic: Solid Mechanics
                    genre: Research subject
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                languageTerm: eng
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                publication/journal-article
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                Published
                4
                
Validerad; 2016; Nivå 2; 20160816 (andbra)

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                        Stefan
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                        Luleå tekniska universitet
                        Material- och solidmekanik
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                dateIssued: 2016
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                    title: Journal of Materials Processing Technology
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                    0924-0136
                    1873-4774
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                        @attributes: 
                            type: volume
                        number: 238
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                        start: 315
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