Broken Aluminum Ring!

Quote:
Hammer testing is inconclusive.



What does hammer testing prove? Can you duplicate the test every time? I don't think so...

Break testing on a dyno is valid as long as the test replicates the use that is expected in the field.

Dropping a thousand pound load twenty feet onto one of those rings isn't a valid test for body support.

Dan...give more details on that ring break. Posting a pic without details doesn't mean very much. For all we know that was used to pull a dumptruck out of the mud :)
 
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Dan...give more details on that ring break. Posting a pic without details doesn't mean very much. For all we know that was used to pull a dumptruck out of the mud :)

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Tom the photo is from the first posting in this thread and is what this whole thread has been about.
grin.gif
 
I am happy for all the discussion my post has generated. Is there a metalurgist out there who can shed some light on my specific ring? I severely abused and overloaded four other alumimum rings far outside of their intended use envelope; each held on much longer than I expected and broke only after deforming beyond recognition.

Alumimum or steel, a ring should bend/deform/elongate before breaking. It certainly should not snap cleanly at 90 degree intervals.
 
The results: 3' friction saver, two new Sherill rings, one gold(large) one small(silver), placed in a basket style configuration, like you would use it. Test broke at 14000lbs!!!!video to come
second: Five year old rings from Sherill. basket style, broke at 11000lbs.

Conclusion: Alum. rings are bomber, if in doubt have them tested.Of course look at your gear closey.
 

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NoB..you rock!

The small ring appears to have broken pretty cleanly at 180 degrees.

Great follow thru and presentation. Thanks for sharing.
 
I just saw the videos...first time I have seen a break test..thanks. Very impressive...that first break really got your attention...Ha!
 
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No Bivy,

Thank you for performing those tests. Will you post a pic of the cross section?

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Sure. Here they are. big ring
 

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What does the hammer test say for the effects of dropping a biner or a friction saver on a hard surface? I suppose I did not imagine aluminum to be that brittle. There are occasions in our work where our tools get exposed to impact.
 
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Little ring

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John thanks for sharing the videos of the test. That was a first for me. Standing by that test machine waiting for something to break looks hard on the nerves.
 
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Purchased this friction saver ring from Sherrill early 2006. Pre-climb inspection revealed three hairline cracks. My initial thought was that only the colored coating had split. I clamped it in a vice and struck it with a 16oz. hammer. Here's the result.

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From the information TLHamel gave us in his above quoted first post in this thread are we to conclude that his ring was fine until he hit it with a hammer? Does the colored coating sometimes look like it's cracked?

I also own a FC I bought from Sherrill in 2006 so I'm more than a little curious.
 
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