The Effect of Grain Size and Temperature (77 to 293 K) on the Limiting Displacements During the Shearing of Carbon Steels
The effect of grain size on the limiting displacements due to localization of strains during shearing is described. Tests on carbon steels of 0.09 and 0.44% C content sheared at the temperature from 77 to 293 K were carried out. It has been found that the lowering of the temperature of shearing speeds up localization of strains, particularly at tower carbon contents in steel. As the temperature was lowered, a progressive decline in the influence of carbon content on the value of limiting displacements was observed. Refinement of structure delayed localization of strains in a manner practically independent of temperature. A general form of an equation which describes the simultaneous effect of temperature, grain size and carbon content on the limiting displacements of the material in the plane of shearing has been proposed.
l. P. PERZYNA, Stability problems for inelastic solids with defects and imperfections, Arch. Mech., 33, 4, 587-602, 1981.
A. K. GHOSH, Tensile instability and necking in materials with strain hardening and strain-rate hardening, Acta Mettallurgica, 25, 1413-1424, 1977.
L. P. MILES, On necking phenomena and bifurcation solutions, Arch. Mech., 32, 6, 909-931, 1980.
Z. MARCINIAK, K. KUCZYŃSKI, The forming limit curve for bending processes, Intern. J. Mech. Sci., 21, 10, 609-621, 1979.
A. K. CHAKRABARTI, J. W. SPRETNAK, Instability of plastic flow in the directions of pure shear, Trans., 6A, 733-747, 1975.
K. TANAKA, J. W. SPRETNAK, An analysis of plastic instability in pure shear in high strength AIS! 4340 steel, Metal. Trans., 4, 443-454, 1973.
S. DZIDOWSKI, The effect of strain hardening factor on limiting displacements during transverse shearing, Advanced technology of plasticity 1984 vol I. Proceedings of the first international conference on technology of plasticity, Tokyo, vol. I, 617-622, 1984.
S. DZIDOWSKI, Lokalizacja odkształceń plastycznych podczas cięcia w warunkach zaniżonej zdolności materiału do umocnienia odkształceniowego, Rozpr. Inżyn., 32, 2, 1984, 267-274.
S. DZIDOWSKI, Perspektywy rozwoju technologii bezopadowego cięcia materiałów prętowych, Mechanik, 5, 249-251, 1984.