Wing test bench
We have designed, built and commissioned a wing test bench at Empa for the demonstration of the integrated DIMES measurement system to detect and monitor crack initiation and growth.
From design to reality
Thewing was exposed to fatigue loading in up- and downbend. It was loaded quasi-statically to a given deflection and then vibrated with a constant amplitude for several thousend cycles. Both the preset deflection and the amplitude were gradually increased to the point that cracks were initiated and grown in the front spar. For an even harder test, a type of flight cycle loading was applied with excursions into up- and downbend, while vibration amplitudes and frequencies were varied according to a prescribed programme.