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in docrobsters case it does look like a design / manufacturing fault to this amateur. Very little metal around where it has cracked. However the result he got is purely a goodwill measure
OP - can we have pictures as then we will have more information for our armchair engineering ( unfair - we probably have some real engineers here)
I tend to think of modern mech hangers as a bit of a "mechanical fuse" an engineered, preferable failure point.
The trouble is what the failing mech does next. If you're lucky it wraps itself up in the chain and cassette and misses the spokes and stays. But it's not a predictable failure, and as often as not it will end up getting fired into the frame with a few KN behind it...
The 'bent' carbon tube is an odd one OP, are you certain that's what has happened? Composites down tend to do much plastic deformation, plus it will have been a point impact, are there any signs of damage through the laminate? Surface chipping, softer spots, a duller tone when tapped? I think it might be worth your while getting it inspected by someone qualified...
I’m suprised by what some (not the OP) think a mech hanger could prevent – think of the force created by a jammed/wrapped up chain driven by a wheel rotating with your momentum behind it. May not matter if the hanger is intact or not by that stage, it’ll be a mess.
yeah, had a few people saying to me the hanger should of failed when the chain got jammed between the cassette and spokes(wasn't shifting at the time, dropped the chain on very rough ground and it bounced over), ripped the mech back and destoyed the bottom of the seatstay where the hanger locates on my rallon.
orbea must have had a few similar issues as they updated the hangers but then they where so weak they where just breaking in normal riding so they have now gone back to stronger ones.
i got a crash replacement stay from them.
“Mech was trapped in the spokes below the chain stay. I was off the power as soon as I felt it lock.
Even if you were off the power instantly unless you slammed the brakes on your momentum is still going to pull the mech round and do damage . Unlucky but not warranty , best you can hope for is a goodwill gesture so my advice would be tell the shop or manufacturer what happened and don't go in with all guns blazing .
On the Warranty point, I doubt you'll make a claim stick.
The question to answer is What was the material defect with the bike that caused your issue?
From what I can tell, you were riding through a field of Barley, and your mech got jammed up with barley? Which sent it sideways into your wheel and then it got wrapped round into the stay...
what you've typed so far would suggest to me that the cause of your problem was riding through Barley, not shoddy bike manufacture.
I've done something very similar myself recently, but with ferns and bushes in my local woods, the hanger failed as intended (the jockeys were choc full of plant material).
I was lucky and the speed was low enough that I only tore the mech off, no wheel or frame damage... But the basic cause was my own enthusiastic ploughing into some undergrowth, I can't really claim otherwise...