The dynamic load results from accelerations, as the name suggests, during movement dynamics. With loads z. B. by lifting trucks, the surface pressure of the floor covering is calculated according to Hertz's formula. Hertz's formulas are the standard method for calculating the surface pressure between curved bodies. The following information is required for the calculation:
• total weight (including maximum payload);
• number of wheels;
• Wheel dimensions (diameter and width);
• Material of the tires (Shore hardness)
A generally applicable limit value for the surface pressure cannot be specified. Experience shows, however, that needle punch coverings 6.0 mm thick can withstand pressures of up to 250 N / cm² (approx. 25 kg / cm²). This requires a correspondingly impression-resistant design of the substrate, its pretreatment and the full-surface gluing of the needle felt coverings in accordance with generally recognized rules of construction technology.
Since there are innumerable possibilities of wheel materials and wheel sizes in practice, a generally valid approval of the floor coverings cannot be given. In order to get an exact estimate of the load in a building project, the exact surface pressure must be calculated according to Hertz's formula.