1,721,147 research outputs found
An efficient approach to study multi-layered structures with cohesive interfaces
No full textA novel approach has been recently proposed by the author to study multilayered plate and shell structures with imperfect and cohesive interfaces and delaminations. Stress and displacement fields, which in these systems are characterized by large variations and discontinuities in the thickness direction, are fully described in the theory through a limited number of displacement unknown functions, independent of the number of layers and interfaces and equal to that of single layer theories for fully bonded structures. Applications which highlight the accuracy, range of applicability and limitations of the approach will be presented at the meetin
A homogenized model for progressive delamination of laminated structures with cohesive interfaces loaded dynamically
No full textProgressive interfacial damage and failure in laminated shell structures subjected to blast
No full text
Delaminazione in modo misto di compositi laminati
No full textAnalytic expressions for strain energy release rate and Mixed-Mode stress intensity factors in cracked curved beams with cylindrically orthotropic material properties are derived. The expressions depend on the elastic constants of the material, some geometric factors and the stress resultants at the crack tip. They are applied in a theoretical model based on curved beam theory to analyze delaminated curved beams in pure bending (C-specimen). The results are compared with rigorous elasticity solutions
Problemi di delaminazione in compositi laminati dotati di rinforzi trans-laminari
No full textViene presentato un modello per l’analisi del processo di delaminazione in modo II in laminati anisotropi dotati di rinforzi trans-laminari. I parametri del modello sono valutati mediante risoluzione di un problema inverso a partire da misure sperimentali del profilo della delaminazione. Viene definita l’azione di controllo esercitata da rinforzi trans-laminari in un tipico laminato fibrorinforzato a matrice polimeric
Progressive interfacial damage and failure in laminated shells subjected to blast
No full textThe presentation deals with the problem of damage progression and failure of laminated cylindrical shells subjected to blast loading. Systems where damage is due to the initiation/propagation of delaminations and intra-layer cracks and fiber failure are considered. A mechanical model is formulated based on a discrete layer approach and nonlinear fracture mechanics concepts. The shell is modeled as an assemblage of curved layers, or sub-shells, joined by cohesive/contact-type interfaces. The kinematic fields in each layer are described by first order shear deformation shell theory, which accounts for shear deformations, translational and rotary inertia. The shell is subjected to distributed pressure pulses, such as those resulting from a typical underwater blast. The problem of a long cylinder subjected to an asymmetric pressure load (side-on explosion) under plane strain conditions parallel to the longitudinal axis of the shell will be examined first to investigate the effects of geometrical/material properties, loading conditions and pre-existing damage on the mechanical response and final failure. Preliminary results of the work, for quasi static loading conditions, will be presented at the meeting
Dynamic interaction effects of multiple damage mechanisms on the survivability of composite and sandwich structures
No full textInteraction of multiple damage mechanisms in sandwich systems subject to static and dynamic loading
No full textA homogenized model for progressive delamination of laminated structures with cohesive interfaces loaded dynamically
No full text- …
