Showing papers by "Alberto Milazzo published in 2007"

Boundary element modeling and analysis of adhesive bonded structural joints

Abstract: In this paper, a boundary element technique for modeling and analysis of adhesive bonded structural joints is presented The formulation is developed in the framework of the anisotropic elasticity and attention is focused on the application to composite structural joints built with the splicing concept technique To model and analyze composite bonded joints a multidomain implementation of the boundary element method has been used It has been proven well suited and very effective for the characterization of the mechanical behavior of spliced joints, allowing the analysis of the high gradient stress and strain fields near the splice lines as well as the prediction of the overall distribution of the interlaminar tractions Numerical results show good agreement with analytical solution and finite element analyses

An alternative 2D BEM for fracture mechanics in orthotropic materials

Abstract: An original and alternative single domain boundary element formulation and its numerical implementation are presented for the analysis of orthotropic two-dimensional cracked bodies. The problem is formulated employing the classical displacement boundary integral representation and an alternative integral equation deduced on the basis of the stress function theory. This integral equation written on the crack provides the relations needed to determine the problem solution in the framework of linear elastic fracture mechanics. Numerical examples are reported and discussed to demonstrate the accuracy of the proposed approach. Keyword: Fracture mechanics, orthotropic materials, stress function, stress intensity factor.

Global/Local Fracture Mechanics Analyses of advanced Aerospace Structures

Abstract: Summary In this paper a Hierarchical approach for the analysis of advanced aerospace structures is presented. The proposed Global/Localmodel uses two kind of numerical methods for the different steps of analysis. In particular the first step of the Hierarchical procedure is performed by the Finite Element code Patran/Nastran TM , while the local analysis is performed by using a Boundary Element code based on the multidomain anisotropic technique. The accuracy and the effectiveness of the model have been demonstrated analysing classical stress concentration problems. Then theprocedure has been used to analyze more complex structureamong which a riveted patch repair, applied on a cracked panel, is presented in the present paper.