Closed composite sections with bonded scarf joints
First Claim
Patent Images
1. A bonded joint connecting two substantially tubular adherends comprising:
- a. a substantially tapered scarf surface on the first adherend including a first tapered portion, a level portion and a second tapered portion;
b. a substantially tapered scarf surface on the second adherend in a complementary opposing relationship to said scarf surface of the first adherend including a mating first tapered portion, a level portion and a second tapered portion, complementary to said scarf surface on the first adherend; and
c. an adhesive layer interposed between said scarf surfaces bonding the adherends into a unitary structure of substantially constant thickness across the area of the bond, whereby said adhesive layer transfers applied loads from one adherend to the other, and whereby the joint between the two adherends includes an area that is resistant to creep of said adhesive layer.
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Accused Products
Abstract
A novel joint for connecting a closed composite adherend utilizes complementary scarf surfaces on the adherends and then bonds the adherends together. The angle of the scarf is determined by the materials used and the expected loads. Preferably, constant stiffness is achieved through the joint. In alternative embodiments, lap joint areas are included to create localized stress free zones. A method of creating the scarf surfaces utilizes a wrapping technique in which the edges of a lamina of composite material are prepared so as to provide a desired edge termination which permits each layer to be bonded to the adjacent adherend.
63 Citations
17 Claims
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1. A bonded joint connecting two substantially tubular adherends comprising:
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a. a substantially tapered scarf surface on the first adherend including a first tapered portion, a level portion and a second tapered portion; b. a substantially tapered scarf surface on the second adherend in a complementary opposing relationship to said scarf surface of the first adherend including a mating first tapered portion, a level portion and a second tapered portion, complementary to said scarf surface on the first adherend; and c. an adhesive layer interposed between said scarf surfaces bonding the adherends into a unitary structure of substantially constant thickness across the area of the bond, whereby said adhesive layer transfers applied loads from one adherend to the other, and whereby the joint between the two adherends includes an area that is resistant to creep of said adhesive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A bonded joint connecting two substantially tubular adherends comprising:
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a. a substantially tapered scarf surface on the first adherend including a first tapered portion, a first level portion, a second tapered portion, a second level portion and a third tapered portion; b. a substantially tapered scarf surface on the second adherend in a complementary opposing relationship to said scarf surface of the first adherend including a mating first tapered portion, a first level portion, a second tapered portion, a second level portion and a third tapered portion, complementary to said scarf surface on the first adherend; and c. an adhesive layer interposed between said scarf surfaced bonding the adherends into a unitary structure of substantially constant thickness across the area of the bond, whereby said adhesive layer transfers applied loads from one adherend to the other, and whereby the joint between the two adherends includes areas that are resistant to creep of said adhesive layer.
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10. A bonded joint for connecting two substantially tubular adherends comprising:
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a. a first substantially tapered scarf surface on the exterior of a first adherend; b. a second substantially tapered scarf surface on the interior of the first adherend convergingly meeting said first scarf surface; c. an opposing, diverging pair of substantially tapered scarf surfaces between the exterior and interior surfaces of the second adherend, said pair of scarf surfaces being complementary to said scarf surfaces of the first adherend; d. an adhesive layer interposed between opposing scarf surfaces bonding the adherends into a unitary structure of substantially constant thickness across the area of the bond, whereby said adhesive layer transfers applied loads from one adherend to the other. - View Dependent Claims (11, 12, 13, 14)
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15. A bonded joint for connecting two substantially tubular adherends comprising:
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a. a first substantially tapered scarf surface on the exterior of a first adherend; b. a second substantially tapered scarf surface on the interior of the first adherend convergingly meeting said first scarf surface;
said substantially tapered scarf surfaces on the first adherend including a first tapered portion, a first level portion, a second tapered portion, a second level portion and a third tapered portion;c. an opposing, diverging pair of substantially tapered scarf surfaces between the exterior and interior surfaces of the second adherend, said pair of scarf surfaces being complementary to said scarf surfaces of the first adherend;
said substantially tapered scarf surfaces on the second adherend each including a mating first tapered portion, a first level portion, a second tapered portion, a second level portion and a third tapered portion, complementary to said scarf surfaces on the first adherend; andd. an adhesive layer interposed between opposing scarf surfaces bonding the adherends into a unitary structure of substantially constant thickness across the area of the bond, whereby said adhesive layer transfers applied loads from one adherend to the other, whereby the joint between the two adherends includes areas that are resistant to creep of said adhesive layer. - View Dependent Claims (16, 17)
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Specification