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JB Weld - remove the old glue, re-glue and allow to set, add more to form a 'collar' around the join, possibly incorporating structural splints.
Possibly alternative - a carbon fibre repair kit?
Much will depend on aesthetics and the replacement cost of your headphones as any repair will be weaker than the original...
MrE
Any recommendations for a glue to hold together some plastic that is under slight tension and torque? My daughter stepped on my headphones and broke part of the headband. I tried some loctite superglue powerflex last night and left it over night but it broke instantly again this morning.