METHOD OF DETERMINATION OF YIELD POINT Russian patent published in 1995 - IPC

FIELD: plastometric testing of metals. SUBSTANCE: flexible filling agent 2 is put into ring sample 1 of initial height h prior to stage-by-stage loading with axial compressing force, they are loaded simultaneously. After compression of sample to height h_i its inner d_i and outer D_i diameters are measured, internal pressure q of filling agent in ring sample is determined and reinforcement curve K = K[l_n(h/h_i)] is plotted for material of sample determining yield point with displacement K. EFFECT: increased precision of results in determination of yield point of materials due to determination of strains through force parameter characterizing volumetric strain state of sample and determined without error related to effects of external friction between butts of sample and elements transmitting compressing force. 1 dwg