Modelling of the deformation behavior of FGM

A lot of processes for the manufacture of functionally gradient materials (FGM) have their limitations (simple geometry of components, gradient limited in one direction, etc.). A further treatment by forming processes would extend the field of applications of FGM because it would make it possible to manufacture shaped pieces and to influence the properties of the material. For this it is necessary to predetermine the deformation behaviour by mathematical models. Conventional equations have only limited application because many other influences have to be considered. Therefore, a new model based on mathematical methods of Fuzzy Logic has been developed which can describe the plasto-mechanical behaviour of FGM during the deformation process. Experiments to determine the deformation behaviour have been carried out on different material systems (Al/Cu, 316L/430L, Al /SiC) by using the hot upsetting test. The results show that this kind of modelling is suitable to describe the deformation behaviour very accurately. The model data should be applied for the simulation of the deformation behaviour of FGM component parts by the finite element method.