mercredi 30 avril 2008

Numerical simulation of gun powder and explosives

NUMERICAL SIMULATION OF THE DYNAMICAL MECHANICAL PROPERTIES OF HOMOGENEOUS AND GRANULAR ENERGETIC MATERIALS. B. Schaeffer 25th Int. Annual Conference of ICT, june 28- July 1, 1994, Karlsruhe. AbstractEnergetic materials are usually highly viscoelastic or viscoplastic. They are brittle at low temperatures or under impact. Some are composite materials and their crystalline filler is responsible for a dilatant behaviour.The products made with such materials are subjected to static and dynamical mechanical loads during or after... [Lire la suite]

vendredi 30 novembre 2007

Equilibrium shape of a tree branch

This has been published : C.R. Acad. Sci. Paris, t. 311,série II, pp 37-43, 1990. The whole text with the equations may be may be downloaded here. Abstract The shape of tree branches is computed using the theory of flexure of beams. Numerical computation is used and takes into account large displacements and growth. The coupling between elastic bending and growth results in a branch shape having an inflection point connected with a permanent deformation. Growth stresses The study of stresses in living materials has been the... [Lire la suite]