Laminate of aluminum sheet material and aramid fibers
AssigneeTechnische Hogeschool Delft
InventorsJacobus Schijve, Laurens B. Vogelesang, Roelof Marissen
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Abstract
The invention relates to a laminate composed of two, three, four or more aluminum-containing metal sheets. The metal sheets, which may for instance be of an aluminum alloy, are bonded together by means of adhesive layers. In the adhesive layers, which are of a thermohardening material, there are embedded poly-paraphenylene terephthalamide threads. These threads are provided in the form of yarns made up of endless filaments and lie in a practically straight line in the adhesive which substantially consists of a thermohardening material. The adhesive layers contain the threads in an amount of 20 to 80% by weight.
Claims14
A fiber-reinforced laminate adapted for use as a structural component of an aircraft, comprising:
- at least two sheets of an aluminum alloy, each of said sheets having a thickness of less than 1 mm and a tensile strength of greater than 350 N/mm.sup.2 ;
- an adhesive layer located between each adjacent pair of said sheets, said adhesive layer comprising a thermohardening material disposed between the sheets to bond an adjacent pair of the sheets together;
- aromatic polyamide fibers disposed in each said adhesive layer to reinforce the laminate, said fibers comprising polyparaphenylene terephthalamide yarns made up of endless filaments formed from a material having a modulus of elasticity in the range of 5.times.10.sup.4 to 25.times.10.sup.4 N/mm.sup.2 and an elongation at breakage of at least 2%, said yarns being disposed in substantially straight parallel lines in the adhesive layer and being present in an amount of 20 to 80% by weight based on the combined weight of the thermohardening material and the yarns,
- the thickness of each of the sheets being greater than the thickness of each said adhesive layer containing said fibers.
Dependencies are inferred from the claim text.