Влияние нестационарности коэффициента трения на характер НДС в очаге деформации при волочении проволоки

Abstract

The results of modeling of wire drawing process of steel grade 80 with taking into account nonstationarity boundary friction conditions are presented in the article.The article describes the analytical dependence of boundary friction coefficientof the temperature on the wire surface.There is a basic method of accounting nonstationarity of tribological processes.The article describes a comparative analysis of the stress-strain state of wire in the deformation zone under constant and varying friction coefficient values.Our studies show that the transient character of friction inlarge diameter wire drawing leads to a more pronounced irregularity stress state and values of the damage criterion.The results demonstrate the areas with high concentrations of hydrostatic pressure and overestimated values Cockcroft-Latham criterion, which not previously observed in the simulation of this drawing sequence.