Plastic limit loads for cylindrical shell intersections under combined loading

Junctions in shell structures: A review

“…Results showed that the flexural behaviour of girthwelded circular steel tubes always involved local buckling near the girth weld on the compression side, which significantly affected the moment versus end-rotation response. Skopinsky et al [159] used applied methods of nonlinear analysis to determine the plastic limit loads in shell intersection configurations under combined internal pressure, in-plane moment and out-plane moment loadings. The numerical analyses of shell intersections were performed using FEM, geometrically nonlinear shell theory in quadratic approximation and plasticity theory.…”

The Influence of Loads Superposition, Deterioration Due to Cracks and Residual Stresses on the Strength of Tubular Junction

“…For generality one choices a nonlinear, power law, behavior of structure material, under normal stress, σ, and shear stress, τ, (1) where ε is the strain; γ is the shear strain; M σ , M τ , k and k 1 are material constants. In our recent papers [15 -17], on the basis of principle of critical energy, there have been proposed the following relations for the critical stresses of tubular specimens with cracks, (2) where the total deterioration D(a σ ; c) depends on the crack depth a≡a σ and the crack length 2c in the direction perpendicular to the direction of the normal stress σ, while deterioration D(a τ ; c) depends on the depth of the crack a≡a τ and the crack length c 2 in the direction of shear stress τ.…”

“…Skopinsky et al [1] underlines: in practice [2 -4], only two methods are the most commonly used in the analysis of pressure vessels with nozzles and piping tees: the Twice Elastic Slope method and the Tangent Intersection method. Both methods are based on a characteristics loaddeformation curve and are empirical procedure.…”

“…Other methods for inelastic analysis of shell intersections under combined loading were expound by Skopinsky et al [1]. It is, to underline the experimental investigations and/ or the results of tests and finite element analysis of branch junctions [1, 6 -8] under different combined loadings, which show that the problems of shell intersections subjected to combined and/or mixed -mode load has not been investigated sufficiently.…”