Transversely isotropic constitutive properties modeling of tubular sandwich composite structures Axial mechanical properties

Sandwich structures have been studied extensively for planar structures; however, the use of composite tubing, manufactured by pultrusion, in a bending situation where a core material can contribute to take shear stresses, can find many applications in modern structures made of composite materials. The objective of this article is to develop analytical solutions for axial effective modulus and major Poisson’s ratio of a pultruded unidirectional composite tubing filled with a core material. In this work, the unidirectional composite tubing and its core are considered to have transversely isotropic and isotropic properties, respectively. For the validation of the results, the obtained exact analytical solutions are reduced to a case where both the materials are isotropic and compared to the existing solutions for an isotropic material filling in an isotropic tube. Further validations of our exact analytical solutions for the transversely isotropic tubing and isotropic core are carried out employing a finite...