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Fatigue crack growth in CFRP foam-core sandwich structures

: Rinker, M.; John, M.; Schäuble, R.

National Aerospace Laboratory -NLR- Netherlands:
Bridging the gab between theory and operational practice. 31st Conference and the 25th Symposium of the International Committee on Aeronautical Fatigue, ICAF 2009. Proceedings : 25.-29.05.2009, Rotterdam, The Netherlands
Rotterdam, 2009
International Committee on Aeronautical Fatigue (ICAF Conference) <31, 2009, Rotterdam>
International Committee on Aeronautical Fatigue (ICAF Symposium) <25, 2009, Rotterdam>
Fraunhofer IWM ()
CFRP foam core sandwich structure; fatigue crack growth; double cantilever beam; end notched flexure

Sandwich structures offer a good ratio of bending stiffness and strength to weight. A typical sandwich failure mode is the occurrence of cracks in the interface between face sheet and core caused by impact. In the last resort the impact damage is non visible and propagates in service under cyclic loads up to global failure. Quasi-static and cyclic modified DCB and ENF tests were run to investigate the crack propagation under global Mode I and Mode II load.