A post-processing method for interlaminar normal stresses in doubly curved laminates

Error estimation between simple, closed-form analytical formulae and full-scale FEM for interlaminar stress prediction in curved laminates

“…via implementing new element formulations or respectively via postprocessing subroutines which also process variable radii. This approach was already examined by Roos et al [4,8,11,19] who proved its feasibility however, under strict conditions which limit the methods use to predimensioning purposes.…”

“…Numerical calculation is thus mostly executed using shell-element models. These models are easy to create and computationally effective [11]. State of the art shell elements are built to capture in-plane stresses.…”

Three-dimensional stress analysis of orthotropic curved tubes-part 1: Single-layer solution

“…Oktem and Chaudhuri (2007) used a higher order shear deformation theory to obtain an analytical solution for the deformation of a finite-dimensional cross-ply doubly-curved panel. Interlaminar normal stress distributions in moderately thick singly curved laminates were obtained to predict the critical delamination loads observed in experiments (Roos et al, 2007a(Roos et al, , 2007b. Lekhnitskii (1981) developed elasticity solutions for monolithic homogeneous orthotropic cylindrical tubes.…”

Mode-frequency analysis of doubly curved composite laminated shell

“…represents the components of displacement at a point x i (i=1,2,3), while i u denotes the same for the corresponding point at the mid-surface. Assumptions of shallowness, vanishing geodesic curvatures, transverse inextensibility and the strain displacement relations for a double curved shell, based on first-order deformation theory, are given by The curved shell geometry, illustrated in Figure 2 [13], is described by the coordinates (x 1 , x 1 , x 3 ) and it is subdivided into angular segments with the apex angles ϑ ϕ d , d…”