Recessed Double Strap Joint

A recessed double strap joint is made by mechanically machining the joint ends and creating a butt connection reinforced by two straps or belts. It does not alter the joint dimensions but creates a larger bonding area and a better distribution of stresses. The processing or machining to achieve this joint configuration is complex; however, this joint provides high flexural strength and is well suited to handling a wide variety of stresses, including peel, shear and impact. This is one of the most effective joints that can be created with adhesives.

Figure 111 Recessed double strap Bevelled Double Strap Joint

Similar to the double strap joint, a bevelled double strap joint is made by adding a strap or belt to an adhesive bond line. The reinforcing straps will have a chamfer or bevel on both ends, which provides high flexural strength and better stress distribution. The critical function of the bevel is to prevent external assemblies from ‘catching’ the edge of the strap and applying peel forces. The mechanical processing required to create this joint is moderately complex. It should only be used if the bond is subject to materials sliding over the surface on the bonded substrates.

Figure 112 Bevelled double strap

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