"Crenellations" increase lifetime.
Welded fuselage structures must meet high standards of damage tolerance. A high life time is required of such structures. Additionally, economic and weight saving solutions for light-weight structures are in demand. Applying so called “crenellations” to achieve a higher damage tolerance of thin walled structures turns out to be a successful solution with extraordinary potential. Systematic analyses in cooperation with ALCAN-France revealed that keeping constant the structural weight, an increase in lifetime of 90% - 150% under typical operational loads can be achieved. Thereby it is concluded that compared to conventional design, significant saving of weight can be expected with equal lifetime. For further information also see Department Joining and Assessment