TEST PROGRAMME ON ALUMINIUM HONEYCOMB SANDWICH COMPRESSION PANELS.
SHORT BROS AND HARLAND LTD CASTLEREAGH (ENGLAND)
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Forty-two panels constructed of DTD 546 aluminium alloy sheet bonded to 14 in. cell hexagonal honeycomb X 0.001 in. aluminium foil to BS.1470 N.S.3. with Redux 775R adhesive were tested to confirm buckling stresses predicted by the theory of the R.Ae.S. Data Sheets. Good general agreement was obtained between actual and estimated buckling stresses but there was some scatter in results for panels in the plastic range. The effect of the ratio of skin thickness on the value of the shear modulus honeycomb cores as found by the shear beam technique was also investigated and an expression for effective shear area giving reasonably constant values of shear modulus over a wide range of skin and core thickness was obtained. Double block shear specimens were found to be less reliable than shear beams in determination of shear modulus.
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