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Development of an anisotropic constitutive equation and a related data base for modelling the sintering of metal powder compacts

Finite element simulation has been proved to be a useful tool for predicting shape changes of powder compacts during sintering. Most constitutive equations proposed so far for describing powder behaviour are isotropic whereas metal powder compacts obtained by die pressing exhibit a strong anisotropy that should be taken into account for a relevant prediction of dimensional changes during sintering. Within PM MACH project, the development of an anisotropic constitutive equation for sintering powder compacts has been based on the results of an extensive experimental study of the behaviour of warm pressed 316L steel compacts during sintering. This study used dilatometry measurement and provided data on free sintering deformation and viscosity as function of relative density and temperature in pressing and transverse directions. The proposed constitutive equation is of the transversely-isotropic type with regard to the direction of compaction. It contains several material parameters that should be fitted from experimental data. It can be easily implemented in any finite element code devoted to PM process simulation.

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Institut National Polytechnique de Grenoble
Laboratoire GPM2, ENSPG, BP 46
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