Eur. Phys. J. Special Topics 225, 243-252 (2016)
https://doi.org/10.1140/epjst/e2016-02632-9

Regular Article

Combined effects of the in-plane orientation angle and the loading angle on the dynamic enhancement of honeycombs under mixed shear-compression loading

¹ University of Valenciennes (UVHC), LAMIH UMR CNRS 8201, 59313 Valenciennes, France
² National Engineering School of Sfax (ENIS), LA2MP, BP. W3038, Sfax, Tunisia

^a e-mail: tounsi.f@gmail.com

Received: 16 October 2015
Revised: 10 February 2016
Published online: 14 March 2016

Abstract

The combined effect of the loading angle (ψ) and the in-plane orientation angle (β) on the dynamic enhancement of aluminium alloy honeycombs is investigated. Experimental results are analysed on the crushing surfaces (initial peak and average crushing forces). A significant effect of the loading angle is reported. The dynamic enhancement rate depends on the loading angle until a critical loading angle (ψ_critical). Beyond, a negative dynamic enhancement rate is observed. Concerning the in-plane orientation angle β effect, it depends on the loading angle ψ under quasi-static conditions. Under dynamic conditions, a significant effect is reported independently of the loading angle ψ. Therefore, the dynamic enhancement rate depends on the combined effects of ψ and β angles. A global analysis of the buckling mechanisms allowed us to explain the combined effect of ψ and β angles on the initial peak force. The collapse mechanisms analysis explain the negative dynamic enhancement rate for large loading angles.