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dc.contributor.authorGruben, Gaute
dc.contributor.authorLangseth, Magnus
dc.contributor.authorFagerholt, Egil
dc.contributor.authorHopperstad, Odd Sture
dc.date.accessioned2017-12-21T08:54:57Z
dc.date.available2017-12-21T08:54:57Z
dc.date.created2016-01-13T08:21:14Z
dc.date.issued2016
dc.identifier.citationInternational Journal of Impact Engineering. 2016, 88 153-171.nb_NO
dc.identifier.issn0734-743X
dc.identifier.urihttp://hdl.handle.net/11250/2473399
dc.description.abstractLow-velocity impact tests were performed on dual-phase and martensitic steel sheets and compared with corresponding quasi-static tests. The geometry and loading condition of the specimens were similar to formability tests, and the average strain rates before failure were in the range 80–210 s−1 for the low-velocity tests and 0.002-0.005 s−1 for the quasi-static tests. For both loading rates, the sheets failed under pre-dominant membrane loading, and by varying the specimen geometry, the stress states prior to failure ranged from uniaxial tension to equi-biaxial tension. Thus, the most important stress states occurring during an impact event in a thin-walled structure are covered. The experiments were complemented by nonlinear finite element simulations, where higher-order solid elements and a refined mesh were applied to capture the failure of the sheets. The materials were modelled using the Hershey high-exponent yield function combined with the associated flow rule and isotropic hardening. Quasi-static tensile and shear tests and tensile tests at elevated strain rates were performed to calibrate the constitutive relation. The results in terms of force-displacement curves and strain histories at critical positions in the specimens were similar for low-velocity and quasi-static loading, independent of material and specimen geometry. This indicates that the quasi-static test gives a good description of the sheet behaviour under low-velocity impact loading. The numerical simulations were found to be in good agreement with the experimental results, and strengthened the experimental finding that all the sheet-impact tests, except the martensitic steel sheet in a state close to equi-biaxial tension, displayed local necking before final fracture.nb_NO
dc.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleLow-velocity impact on high-strength steel sheets: An experimental and numerical studynb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber153-171nb_NO
dc.source.volume88nb_NO
dc.source.journalInternational Journal of Impact Engineeringnb_NO
dc.identifier.doi10.1016/j.ijimpeng.2015.10.001
dc.identifier.cristin1311548
dc.relation.projectNorges forskningsråd: 237885nb_NO
dc.description.localcode© 2015. This is the authors’ accepted and refereed manuscript to the article. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/nb_NO
cristin.unitcode194,64,45,0
cristin.unitnameInstitutt for konstruksjonsteknikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
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