1D analysis of laminated composite and sandwich plates using a new fifth-order plate theory

Abstract

In the present study, a new fifth-order shear and normal deformation theory FOSNDT is developed for the analysis of laminated composite and sandwich plates under cylindrical bending. The theory considered the effects of transverse shear and normal deformations. To account for the effect of transverse shear deformation, in-plane displacement uses polynomial shape function expanded up to fifth-order in-terms of the thickness coordinate. Transverse displacement uses derivative of shape function to account for the effect of transverse normal deformations. Therefore, the present theory involves six independent unknown variables. The theory satisfies traction free boundary conditions at top and bottom surfaces of the plate and does not require the shear correction factor. The principle of virtual work is used to obtain the variationally consistent governing differential equations and associated boundary conditions. Analytical solutions for simply supported boundary conditions are obtained using Navier's solution technique. Non-dimensional displacements and stresses obtained using the present theory are compared with existing exact elasticity solutions and lower and higher-order theories to prove the efficacy of the present theory. The comparison shows that the displacements and stresses predicted by the present theory are in good agreement with those obtained by using the exact solution.

2D analysis of laminated composite and sandwich plates using a new fifth-order plate theory

“…A fifth-order shear and normal deformation theory is initially developed by authors for the cylindrical bending i.e. 1D analysis of laminated composite plates (Naik and Sayyad 2018). In this study, it is extended for the bi-directional bending analysis of laminated composite and sandwich plates.…”

Novel higher-order zigzag theory for analysis of laminated sandwich beams

“…36 compared the performance of various available HOSDTs based on polynomial expansions using Carrera’s unified formulation (CUF) for analysis of sandwich beams. Recently, Naik and Sayyad 37 and Sayyad and Naik 38 proposed a fifth-order HOSDT-based model for the analysis of laminated composite and sandwich plates. HOSDT gives the continuous variation of the transverse shear strain across the thickness but shows a discontinuity in the shear stress distribution at interfaces due to different values of shear rigidity at the adjacent layers.…”