Sb. Petersen et al., AN ALTERNATIVE RING-TEST GEOMETRY FOR THE EVALUATION OF FRICTION UNDER LOW NORMAL-PRESSURE, Journal of materials processing technology, 79(1-3), 1998, pp. 14-24
Citations number
16
Categorie Soggetti
Material Science","Engineering, Manufacturing","Engineering, Industrial
Quantitative evaluation of the tribological conditions at the tool-wor
kpiece interface in metal forming is usually accomplished by the ring-
compression test. The popularity of the test can be attributed to its
practical convenience including the fact that friction can be judged f
rom deformation alone. Due to the geometrical design of the convention
al ring-test, the interface stresses will, however, always be greater
than the how stress of the material, thereby impeding quantification o
f friction, and evaluation of the behaviour of lubricants, for process
es where interface stresses below the flow stress of the material occu
r. This paper presents a new complementary ring-test geometry, which a
llows the characterisation of friction under low pressure conditions.
Finite-element analysis in conjunction with metal experiments applying
both the conventional and the modified geometry for different lubrica
nts provides the validation for the general feasibility of the propose
d test geometry. (C) 1998 Elsevier Science S.A. All rights reserved.