Mathematical modeling of sintering during powder forming processes

This paper describes a study of densification induced by local capillary forces during compaction of powder based materials. A coupled sinter-compaction model with an internal state parameter was proposed. An internal state parameter was assumed as the sintering stresses on contact areas between powder particles. The mechanical model describing the plastic deformation during the P/M forging of a preform is based on the plasticity theory of porous metals. The numerical investigation of P/M forming processes is based on the rigid-plastic finite element model. A finite element program taking into account the sintering effect during P/M forming is created. A numerical example is considered.