The Durability of Metal-Honeycomb Sandwich Structure Exposed to High Humidity Conditions
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AERONAUTICAL AND MARITIME RESEARCH LAB
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Metal-honeycomb structure plays an important role in the structural integrity of RAAF F-111 aircraft. When F-111 is retired from service honeycomb panels will have experienced extended exposure to hostile environments. The processes leading to degradation of metal-honeycomb sandwich structure and its effect on the structural integrity of F-111 structure is critical information required for successful, long term aircraft management. The work presented in this report summarizes initial investigations into the mechanical strength response of metal-honeycomb sandwich structure exposed to high humidity environments. Honeycomb sandwich panels constructed from core and structural adhesives materials currently used for repairs at RAAF-Amberley have been conditioned in high humidity environments and examined using flatwise tension, peel and bending tests. The durability performance of honeycomb panels depended on the construction materials and the mode of loading employed. In some cases, characterization of the honeycomb revealed differences that could be related to the durability performance.
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