Експериментально-анал?тичний метод побудови в’язкопластично? модел? матер?алу для титанового сплаву ВТ6 на основ? випробувань на згин

摘要

A method of experimental-analytical construction of deformation curves based on bending tests has been developed. The method is based on the solution of the system of equations of equilibrium of moments of internal and external forces with a clean bending of the workpieces. Equations for finding linear coefficients of approximation of the deformation curve describing the viscoplastic models of the material obtained theoretically on the basis of the kinematic model of pure bending, which relates the geometric parameters of the workpiece to the components of the strain rate tensor of the workpiece material and the time of its deformation. Based on experimentally determined time dependences of the internal radius of the workpiece under the action of a constant torque, using a system of equations, the dependence of the stress intensity on the strain rates for the VT6 titanium alloy at a deformation temperature of 900 ° С is obtained. Comparison of the calculation results with the known data used in the Deform 3D software package for the Ti-6Al-4V titanium alloy (foreign analogue of VT6 in chemical composition) showed that the maximum error does not exceed 16?%. The obtained viscoplastic models of the material can be used to calculate the shaping operations in metal forming.