Forums: Climbing Information: The Lab: Aluminum Lilbro: Edit Log




adatesman


Mar 15, 2009, 11:24 AM

Views: 12445

Registered: Jul 13, 2005
Posts: 3479

Aluminum Lilbro
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Name: Aluminum Lilbro Bhickey & Friends
Total Score: 50.85
Range: 97.4 134.3mm
Weight: 215.5 grams
Strength: 9.22 kN
Failure Mode: Yielding of the aluminum tube where it contacted the fixture
Video: Link
Comments: Frankly Im rather surprised by how low a force the Aluminum Lilbro failed at. From talking with Mal at Trango, regular Big Bros generally fail by way of the sling pulling through the aluminum of the tube rather than yielding of the end of the tube. I suspect the difference is in the materials used, with the Lilbro using a much weaker alloy than Trango does with its Big Bros. On another note you pretty much needed 3 hands and a prehensile tail to place the Aluminum Lilbro since the threaded portion was free to rotate, which means that you needed to hold it in position when tightening the collar to keep the bevel pointed the right way. Getting it to stay in the fixture was a bit of a problem as well since any bit of sling-induced rotation liked to pop it out. If it did stick removal generally required the use of a hammer. Oh, and the pause when pulling it (and corresponding dip in the force curve) came when I saw how much it was yielding and decided to pull it to failure at 75% expansion rather than try and get it to work in its deformed state at 50% expansion.

Scoring:


Before:

After:

Detail:

Forces:


(This post was edited by adatesman on Mar 17, 2009, 3:47 PM)
Attachments: alum-lilbro.JPG (25.9 KB)
  alum-lilbro_score.JPG (21.9 KB)



Edit Log:
Post edited by adatesman () on Mar 15, 2009, 11:31 AM
Post edited by adatesman () on Mar 15, 2009, 11:49 AM
Post edited by adatesman () on Mar 16, 2009, 1:58 PM
Post edited by adatesman () on Mar 16, 2009, 2:06 PM
Post edited by adatesman () on Mar 16, 2009, 4:51 PM
Post edited by adatesman () on Mar 17, 2009, 11:41 AM
Post edited by adatesman () on Mar 17, 2009, 2:25 PM
Post edited by adatesman () on Mar 17, 2009, 3:45 PM
Post edited by adatesman () on Mar 17, 2009, 3:47 PM


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