J. Phys. IV France 08 (1998) Pr8-317-Pr8-324
Homogenization of discrete mediaF. Pradel and K. Sab
CERAM-ENPC, 6 et 8 avenue Blaise Pascal, Cité Descartes-Champs-sur-Marne, 77455 Marne-la-Vallée cedex 2, France
Material such as granular media, beam assembly are easily seen as discrete media. They look like geometrical points linked together thanks to energetic expressions. Our purpose is to extand discrete kinematics to the one of an equivalent continuous material. First we explain how we build the localisation tool for periodic materials according to estimated continuum medium type (classical Cauchy, and Cosserat media). Once the bridge built between discrete and continuum media, we exhibit its application over two bidimensional beam assembly structures : the honey comb and a structural reinforced variation. The new behavior is then applied for the simple plan shear problem in a Cosserat continuum and compared with the real discrete solution. By the mean of this example, we establish the agreement of our new model with real structures. The exposed method has a longer range than mechanics and can be applied to every discrete problems like electromagnetism in which relationship between geometrical points can be summed up by an energetic function.
© EDP Sciences 1998