Wednesday, September 28, 2011

Types of Joints

A Joint is the location where an adhesive joins two substrates. The Geometry of a joint refers to the general shape of an adhesive bond.

The two main factors to consider when designing a joint for adhesives are the strength and aesthetics.

Typical joint designs:
Lap/Overlap Joint - A lap joint, also known as an Overlap joint, is formed by placing one substrate partially over another substrate.
Joggle Lap Joint - A joggle lap joint is an offset joint very similar to the lap joint.
Double Lap Joint - A double lap joint incorporates two lap shear joints in one.
Butt Joint - A butt joint is formed by bonding two objects end to end.
Scarf Joint - A scarf joint is an angular butt joint. Cutting the joint at an angle increases the surface area.
Strap Joint - The strap Joint is a combination overlap joint with a butt joint. There are single and double strap joints.
Cylindrical Joint - A cylindrical joint uses a butt joint to join two cylindrical objects.
Biscuit Lid Joint – The biscuit lid joint is a variation of a joggle lap joint
Toggle Joint - A toggle joint is formed by fitting the two substrates together in a ‘tongue and groove’ type formation.
Stepped Lap Joint - This is a variation of a lap shear joint.
Flange Joint - This is a variation of an Overlap Joint.


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