VERIFICATION OF THE ADEQUACY OF THE METHOD FOR DETERMINING THERMAL FLUCTUATION CONSTANTS BY DIRECT TEMPERATURE AND REFERENCE POINT FOR WOODEN STRUCTURES

It is shown that at present the prediction of durability is carried out on the basis of the thermofluctuation concept of destruction and deformation of solids. According to this concept, in order to predict durability, it is necessary to experimentally determine the four thermal fluctuation constants of the generalized Zhurkov equation. One of the methods for determining constants is the direct temperature and control point method. There are cases of convergence of the direct temperatures of the dependence of the logarithm of durability on voltage to a point at an extremely low temperature. This pattern is observed for wooden structures. Therefore, the purpose of this work is to experimentally verify the adequacy of this technique for the case of convergence of direct temperatures to a point at extremely low temperatures using the example of wooden structures. The paper experimentally determined the values of durability of wooden beams at three different ambient temperatures and five values of non-destructive stresses for each of the selected temperatures. The thermal fluctuation constants of the generalized Zhurkov equation are determined in the classical way and using the direct temperature and control point method. The obtained results were compared, and conclusions were drawn about the possibility and scope of the methodology for determining durability by direct temperature and control point in the case of convergence of direct temperatures to a point at extremely low temperature.