Combining All Damages

At any given time during the service life, the curing factors are first determined based on the current time. The stiffness is updated using the following equation:

In the meantime, both UCS and MOR are updated following the curing model respectively. The vertical stress needed to drive crushing damage and the tensile stress needed to drive fatigue damage are then calculated for each axle load. The fatigue life and crushing life are then calculated using the updated UCS and MOR.