METHOD FOR DETERMINING THE THERMAL FLUCTUATION CONSTANTS OF THE GENERALIZED ZHURKOV EQUATION BY THE REFERENCE BEAM METHOD Russian patent published in 2021 - IPC G01N3/32 

FIELD: construction industry.

SUBSTANCE: proposal relates to the field of construction and can be used to determine the estimated service life of building materials. On a six-position stand, samples of material in an amount of at least 6 are loaded with at least 5 values of non-critical load at three constant temperatures with time-to-failure fixation. To determine the thermal fluctuation constants of the generalized Zhurkov equation, a reference beam with the coordinates of the pole point (10; -1) was used, i.e. lgτ_0r = -1, σ_mr = 10 MPa and the maximum temperature of existence of a solid T_mr = 500 K, for which the structural-mechanical constant γ_r is 50 kJ/(mol·MPa), constant U_0r = 500 kJ/mol. The constant lgτ₀ must be determined from the position of the pole point. The limiting temperature of the existence of a solid T_m is derived from the linear dependence of the tangent of the angle of inclination of the direct temperatures of the graph lgτ - σ, based on the condition that at the limiting temperature of the existence of a solid, the tangent of the angle of inclination of the straight line is zero. The structural-mechanical constant γ should be obtained by multiplying the reference value of the constant by the ratio of the limit temperature of the existence of a solid to the reference limit temperature of the existence of a solid. The constant U₀ should be obtained by multiplying the reference value of the constant U_0r by the ratio of the limit voltage to the reference limit voltage and by the ratio of the angular coefficient of the linear dependence of the tangent of the angle of inclination of the forward temperatures to the inverse temperature value to the reference value of the angular coefficient.

EFFECT: reduction in the labor required to determine the thermal fluctuation constants of the generalized Zhurkov equation while increasing the reliability of their determination (reducing the error in determining the constants).

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