THE EFFECT OF UV IRRADIATION ON THE THERMAL FLUCTUATION CONSTANTS OF FIBERBOARD AND CHIPBOARD DURING PENETRATION
The results of experimental studies of the operational properties of chipboard and fiberboard exposed to UV irradiation are presented. The relevance of the work lies in the need to identify the effect of external factors on the properties of wood slabs and consider the results obtained when predicting long-term strength. To obtain reliable data, the thermal fluctuation concept of strength is applied, which allows considering the simultaneous effect of temperature, time, and load, as well as additional external influences. The patterns of destruction and deformation of wood slabs during penetration in a wide range of constant stresses and temperatures, both without additional influences and under the action of UV irradiation, have been studied. Thermal fluctuation constants indicating the nature of destruction and the degree of danger of exposure are calculated. It is established that for all materials, after the action of UV irradiation, there is a significant loss of durability and strength.