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The collapse response of sandwich beams with a Y-frame core subjected to distributed and local loading

Rubino, V. and Deshpande, V. S. and Fleck, N. A. (2008) The collapse response of sandwich beams with a Y-frame core subjected to distributed and local loading. International Journal of Mechanical Sciences, 50 (2). pp. 233-246. ISSN 0020-7403. doi:10.1016/j.ijmecsci.2007.07.007. https://resolver.caltech.edu/CaltechAUTHORS:20190919-172858924

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Abstract

Sandwich beams comprising a Y-frame core have been manufactured by assembling and brazing together pre-folded sheets made from AISI type 304 stainless steel. The collapse responses of the Y-frame core have been measured in out-of-plane compression, longitudinal shear and transverse shear; and the measurements have been compared with finite element predictions. Experiments and calculations both indicate that the compressive response is governed by bending of the constituent struts of the Y-frame and is sensitive to the choice of lateral boundary conditions: the energy absorption for a no-sliding boundary condition exceeds that for free-sliding. Under longitudinal shear, the leg of the Y-frame undergoes uniform shear prior to the onset of plastic buckling. Consequently, the longitudinal shear strength of the Y-frame much exceeds its compressive strength and transverse shear strength. Sandwich beams were also indented by a flat bottomed punch, and a relatively high indentation strength was observed. It is argued that this is due to the high longitudinal shear strength of the Y-frame. While finite element calculations capture the measurements to reasonable accuracy, a simple analytical model over-predicts the indentation strength. Finally, the finite element method was used to investigate the energy absorption capacity of the sandwich beams under indentation loading. The calculations reveal that for a given tensile failure strain of the face-sheet material, a sandwich beam with Y-frame core has a comparable performance to that of a sandwich beam with a metal foam core. The relative performance is, however, sensitive to the choice of design parameter: when the indentation depth is taken as the design constraint, the sandwich beam with a Y-frame core outperforms the sandwich beam with the metal foam core.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.ijmecsci.2007.07.007DOIArticle
ORCID:
AuthorORCID
Rubino, V.0000-0002-4023-8668
Deshpande, V. S.0000-0003-3899-3573
Fleck, N. A.0000-0003-0224-1804
Additional Information:© 2007 Elsevier. Received 12 November 2006, Revised 23 June 2007, Accepted 4 July 2007, Available online 25 July 2007. This work was supported by the Netherlands Institute for Metal Research, project no. MC1.03163, The Optimal Design of Y-core sandwich structures.
Funders:
Funding AgencyGrant Number
Netherlands Institute for Metal ResearchMC1.03163
Subject Keywords:Sandwich beams; Energy absorption; Y-frame core; Indentation
Issue or Number:2
DOI:10.1016/j.ijmecsci.2007.07.007
Record Number:CaltechAUTHORS:20190919-172858924
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190919-172858924
Official Citation:V. Rubino, V.S. Deshpande, N.A. Fleck, The collapse response of sandwich beams with a Y-frame core subjected to distributed and local loading, International Journal of Mechanical Sciences, Volume 50, Issue 2, 2008, Pages 233-246, ISSN 0020-7403, https://doi.org/10.1016/j.ijmecsci.2007.07.007.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98764
Collection:CaltechAUTHORS
Deposited By: Vito Rubino
Deposited On:20 Sep 2019 17:38
Last Modified:16 Nov 2021 17:41

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