Butt joints offer little bond area and load the adhesive in tension and cleavage, so they are the weakest common geometry for adhesives. Any misalignment or bending turns into peel at one edge. Designers avoid them or convert them into lap, scarf, tongue-and-groove or strap joints. They show up mainly in tensile test specimens and in sealing jobs where strength matters less.
Butt joint on that tube end is just asking for it, sleeve it or scarf it.
Also heard as
- end-to-end joint
Related terms
Lap joint
A bonded joint where two parts overlap face to face, loading the adhesive mainly in shear.
Scarf joint
A joint where both parts are tapered to long matching slopes and bonded along the taper.
Cleavage
Loading that pries a rigid joint open from one end, concentrating stress along the leading edge of the bond.
Peel stress
Tension pulling one adherend away from the other at the edge of a bond, concentrated along a thin line.