This　paper　studies　interfacial　mechanical　behavior　of　laminate　beams,　consisting　of　two　piezoelectric　facial　sheets　and　an　elastic　core.　The　study　is　based　on　coupled　multi-filed　finite　element　formulation.　The　emphasis　is　placed　on　mechanical　and　electric　behavior　of　interfaces　between　piezoelectric　material　and　elastic　material,　including　effect　of　geometrical　parameters,　stress　distribution　and　stress　concentration　near　free　edge　of　the　beam　subjected　to　coupling　electric　and　mechanical　loads.　In　particular,　various　parametric　effect　of　laminate　beam　is　explored　and　some　conclusions　are　presented　which　may　be　useful　for　designing　laminate　beam　and　minimizing　stress　concentration　at　the　free　edges　of　the　beam.　(C)　2006　Elsevier　Ltd.　All　rights　reserved.