An analytical model for composite tubes with bend–twist coupling.pdf

Composite Structures 131 (2015) 578–584 Contents lists available at ScienceDirect Composite Structures journal homepage: www.elsevi /locate/compstruct An analytical model for composite tubes with bend–twist coupling A.K. Jonnalagadda, A.S. Sawant, S.E. Rohde, B.V. Sankar ⇑, P.G. Ifju Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611-6250, USA a r t i c l e i n f o a b s t r a c t Article history: A simple analytical model is derived for composite tubes subjected to bending and torsion. The model is Available online 12 June 2015 applied to a novel design of composite tube that exhibits bend–twist coupling such that the shear center of the cross section is away from the tube axis. Analytical expressions are derived for the shear center Keywords: distance – distance of the shear center from the tube axis. Finite element analysis of the tubes is per- Composite tube formed using shell elements. The agreement between analytical and numerical results is excellent. It is Bend–twist coupling found that the shear center distance is independent of the radius of the tube but proportional to the Shear center length of the tube and it is also a function of coefficient of mutual influence of the composite material. Torsion of tubes