dc.date.accessioned 2013-03-12T08:23:24Z dc.date.available 2013-03-12T08:23:24Z dc.date.issued 2012 en_US dc.date.submitted 2012-05-25 en_US dc.identifier.citation Hareide, Ole Jakob Beston. Analytical and semi-analytical methods for buckling and bending of steel elastomer sandwich plates. Masteroppgave, University of Oslo, 2012 en_US dc.identifier.uri http://hdl.handle.net/10852/10875 dc.description.abstract This thesis has been written about the analytical and semi-analytical formulae as an alternative to ﬁnite element analyses in computing lateral deﬂection, buckling loads and ultimate capacity of steel elastomer sandwich plates. Since the introduction of sandwich plates in the aerospace industry several decades ago, the shipbuilding industry is now ﬁnding a use of their own for this type of construc- tion. The major classiﬁcation societies are all in the process of creating rules for the design of sandwich plates for use in the maritime industry and in this process Det Norske Veritas has created the classiﬁcation note CN.30.11 Steel Sandwich Panel Construction. The thought behind these rules is to use formulae in the design of the sandwich panels instead of the more time consuming ﬁnite element method. The work in this thesis has involved ﬁnding the proper analytical formulae for buckling and bending of simply supported sandwich plates from relevant theory and comparing the results from these formulae with the ﬁnite element method. The formulae have been implemented in a Visual Basic-automated Excel spread-sheet which has been made available as a supporting tool for the classiﬁcation note. Another part of the thesis has been to develop a semi-analytical method, using a Rayleigh-Ritz approach, for more accurate buckling strength assessments. This model can be used for both simply supported and clamped plates and calculates eigenvalues for all combinations of in-plane normal and shear forces. It also can accurately account for pre-stresses in the buckling analyses. The results from the analyses are presented along with the underlying theory in this thesis. For the analytical models the results show a good agreement between the formulae and the ﬁnite element method for most cases, with the closed form formulae often being a bit conservative on the safe side. The results for the Rayleigh-Ritz model also show very good agreement with the ﬁnite element method. Some problems were encountered in the modelling procedures of sandwich plates in ABAQUS, especially with the solid element models. This can be the cause of some of the diﬀerence between the analytical and ﬁnite element models in the results. eng dc.language.iso eng en_US dc.title Analytical and semi-analytical methods for buckling and bending of steel elastomer sandwich plates en_US dc.type Master thesis en_US dc.date.updated 2012-11-05 en_US dc.creator.author Hareide, Ole Jakob Beston en_US dc.subject.nsi VDP::413 en_US dc.identifier.bibliographiccitation info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Hareide, Ole Jakob Beston&rft.title=Analytical and semi-analytical methods for buckling and bending of steel elastomer sandwich plates&rft.inst=University of Oslo&rft.date=2012&rft.degree=Masteroppgave en_US dc.identifier.urn URN:NBN:no-31711 en_US dc.type.document Masteroppgave en_US dc.identifier.duo 164930 en_US dc.contributor.supervisor Lars Brubak, Eivind Steen og Jostein Hellesland en_US dc.identifier.bibsys 123493919 en_US dc.identifier.fulltext Fulltext https://www.duo.uio.no/bitstream/handle/10852/10875/2/OleJHareideMasteroppgave.pdf
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