Fatigue is fatigue- size/magnitude of forces and number of cycles/time.
Incase anyone's interested, there's a nice 3 page article about fatigue (in general)here.
Fatigue is fatigue- size/magnitude of forces and number of cycles/time.
Thanks for that hotrodder..........I just bought a BMW
Fortunately its only got 17" rims and run flat tyres
Just hope you don't have to replace them, was getting some tyres last friday when a chap came in with run flat BMW tyre, they quoted over £400 to replace mind you the fancy Audi in front of me had just spent £1500 on 2 tyres!
What I was trying to convey was, if a Super bike team, with all the facilities they have access to don't find a crack. How is a person with less access to facilities/knowledge know if a wheel is suitable for continued use
.....and they will continue to produce as long as people are daft enough to buy....
17" & runflats... my idea of hell on the road.....wont even concider any wheel that takes less than 65 section. & I dont care what it looks like, its comfortable, and unnessisary.
Thanks Mike
Thanks Mike
That was a good link Delgado. Goes well with this one which is more about working out how it broke... http://www.asminternational.org/pdf/spotlights/jfap0502p011.pdf
I don't expect an answer as you've failed to provide an answer to TechnicAl's question and now decided that the manufacurers "waffle" instead of telling us about all these cast wheels that are not heat treated as you claimed but what the hell...
Yep insurance companies will pay to have a wheel refurbished rather than replace. Personally i'm only aware of build up work for scuffs/surface damage, never heard of one paying to have a broken wheel repaired not that it means much as i'm one bloke with a handful of clients in the motor trade. Feel free to correct me but remember we want FACTS backed up with EVIDENCE as there's too many "EXPERTS" around. If there's a wheel specific BS standard for this sort of thing then i'm all ears (seriously, i would love to know)- where have they drawn the line... deep kerbing = OK repair, what about cracks? Limited to certain sections of the rim only or is it a free for all as long as someone has paid for a training course to get their BS certificate? If one has this certificate does it allow access to procedures and methods of repair? You know, the sort of thing that car manufacturers provide covering methods for the various different fancy steels used these days
Insurance companies care about one thing only. Money. Ignoring the fact that (in the UK at least) motor vehicle insurance is a loss making nuisance to them they don't give a damn about safety or engineering only what the numbers suggest is the least likely to cost them or will cost them the least in the longterm... think along the same lines as that Ford Pinto expolding fuel tank controversy
Very true. There's a pretty big difference between a little build up work for scars that are too deep to be 'lost' during refurbishment and a cracked wheel. The outer lip is under relatively little stress and the heat input needed to build up a low spot is relatively small- done right (and it's pretty hard to do it wrong) you could touch the wheel (next to the weld) pretty much immediately without burning yourself.
Fatigue is fatigue- size/magnitude of forces and number of cycles/time. Cornering forces and speeds are going to be higher on a track but on the other hand race tracks are generally nice smooth places unlike public roads which are currently more potholed than the average dirt track. Racing generally = lower mileages between servicing/inspection whereas for many the only time their road car gets looked at is when there's no choice i.e. MOT due or it broke
ETA
Some do... http://www.bbc.co.uk/blogs/watchdog/2009/10/bmw_alloy_wheels.html and it seems to be coming a more common occurance, potholes are getting bigger while tyres are becoming ever more 'rubber band' like in the quest to have bigger wheels than the neighbours
Last time I drove a car with that section of tyre I managed to fold them under the rims round a roundabout!