Dynamic response of curved sandwich beam with a soft flexible core subjected to radial low velocity impact

F. Ashenai Ghasemi^*, K. Malekzadeh Fard, M. A. Khalili

Journal of Solid and Fluid Mechanics, Volume 5, Issue 1, 2015(1), Pages 13-29. (ISC) (In Persian)

Abstract

In this paper, the dynamic response of a curved sandwich beam with soft flexible core, subjected to a radially low velocity foreign impact on the middle of top face sheet is studied. The dynamic responses which are composed of circumferential and radial displacement of the core, top and bottom face sheets, as well as the radial and shear stresses in the core layer are identified. The higher order shear deformation theory was used in the structural formulation. The two degrees of freedom mass-spring model with linearized stiffness was used for modeling of impact phenomena. In order to derive the governing equations of beam structure, the Hamilton principle was used. The results were validated and compared with the results obtained from finite element ABAQUS software and the latest available literature. The effects of some structural properties like the module of elasticity and the thickness of core layer on the displacement, shear stresses and strains were studied. Also, the effects of radius and initial velocity of the impactor on contact force history were investigated.it was seen that by multiplying by 2 of the elasticity modulus of core to upper layer ratio, the core deflection only reduces about 10 percent. One also sees that by increasing the core to beam thickness ratio, the core deflection reduces about 6 times.

Keywords

Sandwich curved beam; Low velocity impact; Sandwich plate theory; Mass-spring model.