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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum Repaired Wheels More Susceptible to Damage?
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      07-13-2015, 10:57 AM   #1
dbs600
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Repaired Wheels More Susceptible to Damage?

Anyone know if bent or out of round wheels that have been straightened and repaired are more susceptible to future damage, such that they’d have a resulting ‘weak’ spot?

Thanks!
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      07-13-2015, 11:41 AM   #2
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Yes, but it depends on what type of metal/aluminum mix they use. Regardless of what material they use, the structure weakens internally(think of bending a paper clip back and forth until it breaks). Since the wheels are supposed to be hard and hold up to a lot of pressure, I doubt it can bend many times.

It is called metal fatigue and it is cumulative effects. Even if they heat up the wheel to reshape it, it won't be the same.

I don't think it's a big deal if it's only once. But it is a big deal 2 or more times. However, note that after you bent it the first time, it takes less impact to bend the wheel again.

http://www.epi-eng.com/mechanical_en..._in_metals.htm
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      07-13-2015, 11:43 AM   #3
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But the good news is that one day, 3D printing for metals will be advanced enough that a local shop can just reprint the wheel and recycle the old one into print materials.

We can already do this today but it's expensive. The machine itself cost 10s of millions.
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      07-13-2015, 09:50 PM   #4
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Quote:
Originally Posted by 493263 View Post
Yes, but it depends on what type of metal/aluminum mix they use. Regardless of what material they use, the structure weakens internally(think of bending a paper clip back and forth until it breaks). Since the wheels are supposed to be hard and hold up to a lot of pressure, I doubt it can bend many times.

It is called metal fatigue and it is cumulative effects. Even if they heat up the wheel to reshape it, it won't be the same.

I don't think it's a big deal if it's only once. But it is a big deal 2 or more times. However, note that after you bent it the first time, it takes less impact to bend the wheel again.

http://www.epi-eng.com/mechanical_en..._in_metals.htm
Quote:
Originally Posted by 493263 View Post
But the good news is that one day, 3D printing for metals will be advanced enough that a local shop can just reprint the wheel and recycle the old one into print materials.

We can already do this today but it's expensive. The machine itself cost 10s of millions.
Thanks for the great info; I appreciate it!

And wow; us BMW owners should band together to pickup one of those printers.
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