Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression.pdfVIP

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Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression.pdf

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Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression.pdf

Composite Structures 152 (2016) 626–636 Contents lists available at ScienceDirect Composite Structures journal homepage: /locate/compstruct Experimental investigation on the energy absorption and contact force of unstiffened and grid-stiffened composite cylindrical shells under lateral compression Majid Moeinifard a, Gholamhossein Liaghat a,b,?, Gholamhossein Rahimi a, Ali Talezadehlari a, Homayoun Hadavinia b a Faculty of Mechanical Engineering, Tarbiat Modares University, P.O. Box 15115-111, Tehran, Iran b School of Mechanical and Automotive Engineering, Kingston University, London, UK article info Article history: Received 29 November 2015 Revised 11 April 2016 Accepted 23 May 2016 Available online 24 May 2016 Keywords: Composite shell Grid-stiffened Lateral compression Contact force Energy absorption abstract In this paper, two different types of unstiffened and lozenge grid-stiffened E-glass/epoxy composite cylindrical shells are experimentally investigated under lateral compression. The composite shells are compressed in two different loading conditions; between two rigid ?at platens and between a rigid ?at platen and a rigid cylindrical indenter which is aligned perpendicular to the shell axis. The effects of the grid stiffeners on the stiffness, contact force and energy absorption capacity of the composite cylindrical shells are investigated in the two mentioned loading conditions. Incorporation of grid stiffeners in the composite cylindrical shells leads to an increase in the structural stiffness, contact force and energy absorbing capacity in both loading conditions. Furthermore, it is observed that the effect of the stiffeners on the structural stiffness is dominant in the elastic deformation stage of the compression processes. The results show that stiffening the composite cylindrical shells with lozenge grid stiffeners can increase the speci?c energy absorption almost twice in comparison with the unstiffened composite shells; and among all of the specim