METHOD FOR DETERMINING THE SERVICE LIFE OF BUILDING MATERIALS Russian patent published in 2021 - IPC G01N3/00 

FIELD: construction industry.

SUBSTANCE: proposal relates to the field of construction and can be used to determine the estimated service life of building materials. A method for determining the service life of a building material is that 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, boundary conditions are determined to determine the service life of building materials: the logarithm of the oscillation period of the kinetic unit lgτ₀, which is the thermal fluctuation constant of the generalized Zhurkov equation, the limiting stress σ_m and the limiting temperature of the existence of a solid body T_m, also being the thermofluctuation constant of the generalized Zhurkov equation. The logarithm of the oscillation period of the kinetic unit and the limiting voltage are determined by the coordinates of the pole point of the family of fan-shaped direct temperatures, and the limiting temperature of the existence of a solid body is found 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 body, the tangent of the angle of inclination of the straight line is zero. The service life is defined as the sum of the logarithm of the oscillation period of the kinetic unit and the product of 2.3 by the value of the angular coefficient taken with the inverse sign, the direct dependence of the inverse temperature increased 1000 times on the change in the angular coefficient of the direct temperatures of the graph constructed in the coordinates “logarithm of time – voltage”, on the difference between the limiting and operating voltages and on the difference between the inverse values of the operating and limiting temperatures.

EFFECT: simplification of the definition of constants while reducing the labor required to determine the service life of building materials, and increasing the reliability of the forecast.

1 cl, 1 dwg