Abstract: Ductile fracture of porous metals during forging was studied. The effect of the shape of sintered copper preforms on the forming limit is examined in upsetting with flat dies at room temperature. ...

Abstract: Relationship between hardness and flow stress in uniaxial compression is investigated for porous sintered metals. Hardness is defined here as the applied load divided by the surface area of the ...

Abstract: An experimental set-up for cold butt welding is developed. Before conventional upsetting of two specimens to be bonded, surfaces of the specimens are shaved off by an edge to bring out the ...

Abstract: Axisymmetric deformation of anisotropic porous materials caused by geometry of pores or by distribution of pores is analyzed. Two models of the materials are proposed: one consists of spherical ...

Abstract: Four types of lubricant, i.e., dry film, liquid, powdered solid and liquid with powdered solid lubricants, were evaluated for cold extrusion of sintered copper powder preforms. Effects of the ...

Abstract: Deformation behavior of laminated sheet metals is estimated by the upper bound method based on Hill’s plasticity theory for anisotropic materials. The r-value and the stress-strain curve are ...