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Fig. 4. Comparison of the deflection according to the applied vertical load. The cores are made of aluminium (55 kg/m?) and L-oriented.

Figure 4 Comparison of the deflection according to the applied vertical load. The cores are made of aluminium (55 kg/m?) and L-oriented.

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Specimen dimensions Table 1
Specimen dimensions Table 1
Fig. 1. Schematic detailed description of the honeycomb sandwich structure.
Fig. 1. Schematic detailed description of the honeycomb sandwich structure.
Mechanical properties of the cores [22] Table 3
Mechanical properties of the cores [22] Table 3
Fig. 2. Sketch of the four point bending test and specimen dimensions.
Fig. 2. Sketch of the four point bending test and specimen dimensions.
Mechanical properties of faces made of aluminium Table 2
Mechanical properties of faces made of aluminium Table 2
Fig. 5. Evolution and comparison of the deflection according to the applied vertical load. The cores are made of aramide fibres (48 kg/m? and 144 kg/m?) and W-oriented.
Fig. 5. Evolution and comparison of the deflection according to the applied vertical load. The cores are made of aramide fibres (48 kg/m? and 144 kg/m?) and W-oriented.
Fig. 6. Comparison of the deflection according to the applied vertical load for the L- and W-directions. The cores are made of aramide fibres of 48 kg/m? density.
Fig. 6. Comparison of the deflection according to the applied vertical load for the L- and W-directions. The cores are made of aramide fibres of 48 kg/m? density.
Fig. 3. Evolution and comparison of the deflection according to the applied vertical load for the L- and W-directions. The cores are made of aluminium (55 kg/m? and 82 kg/m’*).
Fig. 3. Evolution and comparison of the deflection according to the applied vertical load for the L- and W-directions. The cores are made of aluminium (55 kg/m? and 82 kg/m’*).
Fig. 7. Failure modes of sandwich with aramide fibre honeycomb core of 48 kg/m? density.
Fig. 7. Failure modes of sandwich with aramide fibre honeycomb core of 48 kg/m? density.
Fig. 8. Failure modes of sandwich with aluminium honeycomb core of 55 kg/m’.
Fig. 8. Failure modes of sandwich with aluminium honeycomb core of 55 kg/m’.
Fig. 9. Failure modes of sandwich with aluminium honeycomb core of 82 kg/m? and W-oriented.
Fig. 9. Failure modes of sandwich with aluminium honeycomb core of 82 kg/m? and W-oriented.
Principal failure modes under of honeycomb structure under static four point bending test in-plane compressive stresses. In this way it has been possi- ble to evaluate separately the effect of a tensile and a com- pressive stress field on the fatigue behaviour of the tested specimen. The value of the specimen bending stiffness was monitored during all the tests in order to gather infor- mation about the possible reduction of the sandwich struc- tural properties with fatigue cycling. Fatigue data were generated at load levels of 100%, 90%, 80%, 70%, 65% and 60% of the static ultimate load. Two core densities are used: 48 kg/m? (aramide fibres) and 82 kg/m? (alumin- ium) and a minimum of three specimens within each con- figuration. The data acquisition performed monitored the stiffness variation during the tests using the output signals of the load cell and the deflection of the hydraulic piston. However, since the fatigue threshold and maximum
Principal failure modes under of honeycomb structure under static four point bending test in-plane compressive stresses. In this way it has been possi- ble to evaluate separately the effect of a tensile and a com- pressive stress field on the fatigue behaviour of the tested specimen. The value of the specimen bending stiffness was monitored during all the tests in order to gather infor- mation about the possible reduction of the sandwich struc- tural properties with fatigue cycling. Fatigue data were generated at load levels of 100%, 90%, 80%, 70%, 65% and 60% of the static ultimate load. Two core densities are used: 48 kg/m? (aramide fibres) and 82 kg/m? (alumin- ium) and a minimum of three specimens within each con- figuration. The data acquisition performed monitored the stiffness variation during the tests using the output signals of the load cell and the deflection of the hydraulic piston. However, since the fatigue threshold and maximum
Fig. 10. Static failure modes of sandwich with aramide fibre honeycomb core of 144 kg/m?. The L-specimens failed in local buckling of the face while the W specimens showed an anticipated core shear failure.
Fig. 10. Static failure modes of sandwich with aramide fibre honeycomb core of 144 kg/m?. The L-specimens failed in local buckling of the face while the W specimens showed an anticipated core shear failure.
Fig. 11. Comparison of the fatigue lifetime of the L and W configurations in terms of load level vs cycles to failure.
Fig. 11. Comparison of the fatigue lifetime of the L and W configurations in terms of load level vs cycles to failure.
Fig. 12. Fatigue curves in terms of load level vs cycles to failure. The cores are made of aramide fibres and of density of 48 kg/m’, direction L and W.
Fig. 12. Fatigue curves in terms of load level vs cycles to failure. The cores are made of aramide fibres and of density of 48 kg/m’, direction L and W.
Fig. 13. Comparison of the fatigue lifetime of two sandwich structures. The cores are made of aramide fibres of a density of 48 kg/m? and aluminium of a density of 82 kg/m?.
Fig. 13. Comparison of the fatigue lifetime of two sandwich structures. The cores are made of aramide fibres of a density of 48 kg/m? and aluminium of a density of 82 kg/m?.
Fig. 14. Evolution of the crack length vs the applied load and vs the number of cycles to failure for the sandwich structure made of aluminium core of a density of 82 kg/m?.
Fig. 14. Evolution of the crack length vs the applied load and vs the number of cycles to failure for the sandwich structure made of aluminium core of a density of 82 kg/m?.
Fig. 16. Failure modes of the aluminium core in the W and L-directions. Fig. 15. Failure modes of the aramide fibres cores in the W and L-directions.
Fig. 16. Failure modes of the aluminium core in the W and L-directions. Fig. 15. Failure modes of the aramide fibres cores in the W and L-directions.
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