An Experimental and Theoretical Study of Upsetting of Sintered Iron Compacts
Cylindrical sintered iron compacts of various initial densities were subjected to slow and fast upsetting processes under various frictional conditions and between flat and parellel platens. Stress-strain properties of the sintered compacts were obtained from quasi-static compression tests performed under lubricated conditions and expressed as a function of strain and the initial and current densities.
A finite-difference numerical technique was used to simulate the upsetting process incorporating the variable density-dependent stress-strain properties of the billet. This technique enabled the deformation behaviour of sintered iron compacts of any initial density, within the range of the study, to be studied theoretically.
Comparison of the predicted results with those obtained experimentally showed good agreement and suggests that the simulation technique should prove to be very useful in studying sintered iron compacts which do not easily conform to the analysis based on conventional plasticity theory.
Unable to display preview. Download preview PDF.
- 1.HA KUHN (1971). Deformation characteristics and plasticity theory of sintered powder materials. Int J Powder Metall, Vol 7, p 15.Google Scholar
- 5.T TABATA and S MASAKI (1977). A yield criterion for porous metals and analyses of axial compression of porous disks. Kyoto report on plasticity and metal forming, Vol 2, p 51.Google Scholar
- 7.M S J HASHMI and F B KLEMZ (1976). The effect of friction in simple upsetting of cylindrical billets of elastic-plastic and elastic-strain hardening material: A numerical technique. Proc 17th Int MTDR Conf p 597.Google Scholar
- 8.M S J HASHMI (1977). A numerical techniqe for analysing simple upsetting of cylindrical billets of strain rate sensitive material. Proc 18th Int MTDR Conf, p 27.Google Scholar