In summary, Table 9 gathers the maximum tolerable defects
(2amax ) for the different hypotheses. Smaller defects than these
would ensure the structural integrity of the towers during their
entire lifespan. The values in bold characters correspond to
situations in which the limiting conditions are provided by the
fatigue threshold (2amax = 2ath ); those in italics are limited
by crack propagation (where 2amax > 2ath ) and correspond
to situations in which there is propagation during the whole