Fatigue damage evaluation method of rigid polyurethane foam material for repairing and reinforcing

The invention discloses a fatigue damage evaluation method of a hard polyurethane foam material for repairing and reinforcing, and relates to the field of mechanical properties of materials, and the fatigue damage evaluation method specifically comprises the following steps: introducing a loading frequency on the basis of a Chabope damage evolution model; deducing a fatigue damage prediction model of the rigid polyurethane foam material under different stress levels and different loading frequencies, determining unknown parameter values in the model by using a formula in an experiment and deduction process, and fitting a function relational expression of parameters and load conditions and a function relational expression of parameters and density; the model can directly predict fatigue damage of rigid polyurethane foam materials with different densities under different stress levels and different loading frequencies, the influence of the density, the nominal stress level and the loading frequency is considere