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7. Conclusions
The inspection of the blade revealed the following
damages:
 Damage appearing in the form of a crack that affected
the (non-resistant) superficial laminate, extending over
the influence zone of the concentrator and with its likely
origin at the corner between the cover and the root.
 Damage in the form of a crack that affected the resistant
laminate, extending over the zone where there was an
abrupt change in the thickness of the laminate.
 Lack of bonding, lack of resin and diverse manufacture
defects.
The nature of the observed failure seems to be due to a
fatigue mechanism. The configuration of the observed
cracks seems to indicate that first a superficial crack
(Fig. 10a) appeared, probably around the weakest point
(corner between the cover and the root) due to the stress
concentration, this crack progressing throughout the
superficial layer and inducing delamination between this
superficial layer and the resistant laminate. Later on, in the
zone where there was an abrupt change of thickness, the
presence of the superficial crack together with the effect of
the concentrator and the effect of the change in thickness
gave rise to the stress state necessary to generate a crack in
the resistant laminate (Fig. 10b), which completely broke
the laminate, as is observed in Fig. 10c.
By means of the simplified procedure of the standard
GL, a calculation of fatigue life for the laminate
corresponding to the zone of failure has been carried out.
It has been deduced that it is plausible that this laminate
reached a fatigue life in the order of 5 years, considering
that it was subjected to the combined effect of the presence
of the superficial crack, the effect of the geometric
concentrator and the effect of the change in thickness, all
this giving rise to an amplification of the nominal stress at
the zone considered. Additionally, the presence of diverse
defects of manufacture could, in any case, contribute to a
decreme