%B Atti del 17? Convegno Nazionale del Gruppo Italiano Frattura (IGF) %A Alberto Carpinteri %A Marco Paggi %L eprints1923 %D 2004 %X According to the mathematical formalism of the eigenfunction expansion method, the problem of stress-singularities arising from multi-material junctions is addressed. The wedges are composed of isotropic homogeneous materials and are in a condition of plane stress or strain. The order of the stress-singularity is provided for tri-material junctions, paying special attention to the role played by Mode-I and Mode-II deformation. The effect of cracks inside either the softer or the stiffer material is also investigated. Numerical results can be profitably used for establishing optimum material configurations. %O 17? Convegno Nazionale del Gruppo Italiano Frattura IGF17, Bologna, Italy, June 16-18, 2004 %I Gruppo Italiano Frattura %T Influence of the intermediate material on the singular stress field in tri-material junctions %P 263-268