The fullness of a load spectrum is an integration of each level over the number of cycles (N).

In general, the above m entioned hypothesis can be expressed for any load spectrum i as follows:

Vj • f j = C w here C is a constant, which has to be determ ined empirically by tests.

The argum ent for the above hypothesis is that the fullness coefficient or alternatively the product of the fullness coefficient and the corresponding load increm ent coefficient is considered as physical value and defined as follows:

- The fullness coefficient represen ts the quantity of energy applied on the structural com ponent part in the form of deform ation energy.