Prediction the fatigue life of wood-based panels
This work presents the results of an experimental investigation of the vibration response of cyclically loaded wood-based panels. The maximum temperature of the stationary state of the activation zone of samples of wood-based panels in the form of a rigid cantilever with their cyclic load at loading frequencies from 0 to 50 Hz and maximum internal stresses from 0.98 to 5.36 MPa was investigated. The purpose of this study is to determine the temperature of selfheating and to determine the dependence of the temperature on the loading conditions. The mathematical model is proposed in the form of system nonlinear ordinary differential equations, where stress, strain and temperature were used as the essential variables. The behaviour of the system is completely determined by the ratio of the introduced external energy and the value of the order parameter. The critical value of the order parameter depends on the thermo-physical properties of the material and is equal to the ratio of the value of the heat transfer coefficient multiplied by the area of thermal dispersion to the coefficient of linear thermal expansion.