<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Softening and snap-back instability in superplastic deformation"^^ . "The mechanical behavior of micro-structured composites has been experimentally and theoretically proven to be strongly dependent on the size of the reinforcement. In other words,\r\nkeeping constant the reinforcement volumetric fraction and the mechanical properties of the constituent materials, size effects on the mechanical response are observed by varying the diameter of the inclusion. From the technological point of view, an important example where this\r\nsize effect is noticed is represented by superplasticity (Langdon, 1995). Instability phenomena occurring in the microstructure of micro-structured composites are\r\nnumerically investigated in this paper. To this aim, an interface constitutive law is proposed to\r\ndescribe both decohesion and contact at bi-material interfaces. These formulations are\r\nimplemented in the FE code FEAP. Then, by applying dimensional analysis (Carpinteri, 1989),\r\nthe nondimensional parameters governing the macroscopic response of the composite are\r\nidentified. According to this model, transverse debonding with respect to the fiber/particle\r\ndirection is simulated and the transition from snap-back instability in case of coarse inclusion\r\ndiameters to a stable mechanical response for finer reinforcement is quantified. These results\r\nprovide a possible quantitative explanation to the role played by the size of the reinforcement on\r\nthe instability phenomena experimentally observed during superplastic deformation."^^ . "2005" . . "Firenze University Press"^^ . . "Firenze University Press"^^ . . . . . . . . . . . . . . "Alberto"^^ . "Carpinteri"^^ . "Alberto Carpinteri"^^ . . "Giorgio"^^ . "Zavarise"^^ . "Giorgio Zavarise"^^ . . "Marco"^^ . "Paggi"^^ . "Marco Paggi"^^ . . . . . "HTML Summary of #1930 \n\nSoftening and snap-back instability in superplastic deformation\n\n" . "text/html" . . . "TJ Mechanical engineering and machinery"@en . .