Bending collapse analysis for thin and medium-thin-walled square and rectangular hollow shapes

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Lavayen-Farfan D.
Boada M.J.L.
Rodriguez-Hernandez J.A.
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Elsevier Ltd
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Thin-walled hollow shapes are of great interest in many industries with weight constraints due to their availability, low price, and strength to weight ratio. However, they are also prone to localized bending collapse, which can be used as an energy absorption mechanism during deformation. Up until now, industrial applications have relied on numerical simulations, non-standardized tests, and a handful of theories to address the bending collapse behavior. In this paper, a modification to the most widely used theory is presented and adapted for hollow shapes with greater thickness that cannot be considered “thick”. To verify the accuracy of the proposed modification, a comparison with a detailed FEM model, validated through various three-point bending collapse experimental tests, has been performed. The results seem to show that the proposed modifications can predict the maximum load and collapse stage behavior of hollow shapes with more accuracy than the original analytical model. Thus, the proposed modification may be used to predict the collapse behavior of commercially available square and rectangular hollow shapes in different fields of application. © 2021 Elsevier Ltd
D. Lavayen would like to recognize the financial support provided by CONCYTEC (Peru) and The World Bank, through the Pontifical Catholic University of Peru and FONDECYT (Peru): ?Funding Contract N?10-2018-FONDECYT/WB PhD programs in strategic and general areas?. Part of this work has also been supported by Comunidad de Madrid - multiannual agreement with UC3M (?Excelencia para el Profesorado Universitario? - EPUC3M21) - Fifth regional research plan 2016-2020, The authors would also like to thank Dr. M. A. Martinez-Casanova from the Materials Science and Engineering and Chemical Engineering Department at UC3M for his help during testing. All authors approved the version of the manuscript to be published.
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Three-point bending test, Bending collapse, Collapse analytical model