Title: Mathematical modelling of energy absorption in thin-walled grooved conical tubes with considering of strain hardening phenomena

Authors: M.J. Rezvani; M. Damghani Nouri

Addresses: Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran ' Department of Mechanical Engineering, Semnan University, Semnan, Iran

Abstract: In this article, a mathematical model is developed to evaluate the influence of strain hardening on energy absorption and mean crushing load of thin-walled grooved conical tubes. For this purpose, the tubes are shaped with the inner and the outer grooves at different positions along the axis. These grooves facilitate the creating of uniform plastic hinges, and controlling the mode of collapse. The effects of various geometric parameters such as groove distances, groove depth and half apex angle of conical on the collapse response, energy absorption and mean crushing load are investigated. In this analytical model, the variation of circumferential strain and the strain hardening during formation of a fold has been taken into account. In order to verify these analytical results, quasi-static compression tests are performed. The results of this research indicate good agreement between the analytical model and the experimental findings for grooved conical tubes as an energy absorber.

Keywords: strain hardening; energy absorption; mean crushing load; grooved conical tube.

DOI: 10.1504/IJSTRUCTE.2017.089391

International Journal of Structural Engineering, 2017 Vol.8 No.4, pp.308 - 326

Received: 22 Apr 2017
Accepted: 14 Jul 2017
Published online: 22 Jan 2018 *

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