Combined shear/compression structural testing of asymmetric sandwich structures |
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Authors: | B Castanié J J Barrau J P Jaouen S Rivallant |
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Institution: | (1) Institut de Génie Mécanique de Toulouse (I.G.M.T.)/Supaero Laboratoire Structures, BP 4032, 31055 Toulouse, France;(2) I.G.M.T./Université Paul Sabatier, Bat 3PN, 31062 Toulouse, France;(3) Eurocopter France, 13700 Marignane, France |
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Abstract: | Asymmetric sandwich technology can be applied in the design of lightweight, non-pressurized aeronautical structures such as
those of helicopters. A test rig of asymmetric sandwich structures subjected to compression/shear loads was designed, validated,
and set up. It conforms to the standard certification procedure for composite aeronautical structures set out in the “test
pyramid”, a multiscale approach. The static tests until failure showed asymmetric sandwich structures to be extremely resistant,
which, in the case of the tested specimen shape, were characterized by the absence of buckling and failure compressive strains
up to 10,000 μ strains. Specimens impacted with perforation damage were also tested, enabling the original phenomenon of crack
propagation to be observed step-by-step. The results of the completed tests thus enable the concept to be validated, and justify
the possibility of creating a much larger machine to overcome the drawbacks linked to the use of small specimens. |
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Keywords: | Composite sandwich structures shear/compression testing |
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