Forums: Climbing Information: The Lab: Re: [Rob.hack] Drop test fuse breaking strengths.: Edit Log




USnavy


May 2, 2012, 7:21 PM

Views: 3946

Registered: Nov 5, 2007
Posts: 2660

Re: [Rob.hack] Drop test fuse breaking strengths.
Report this Post
Average: avg_1 avg_2 avg_3 avg_4 avg_5 (3 ratings)  

Rob.hack wrote:
From reading other threads on this forum I believe that the 'fuse' method would be the most suitable.

.
In my experience, the fuse method is not as accurate some people think. I did some drop testing on a few pieces of cordlette awhile back and my load cell registered a different breaking strength every time. The standard deviation was through the roof if I remember right. Furthermore, the actual breaking strength of the fuse and the expected strength were quite a bit different. However, I did not conduct some wide-scale testing of a hundred samples. I only tested a handful of samples. But the seemingly random and somewhat unpredictable breaking strain of the samples I did test leads me to believe that using a load cell or similar device is the only appropriate option if you want any reasonable level of accuracy.

The other issue is that a fuse works to a very limited degree to tell you if a fall exceeded a roundabout value, but it does not really tell you how much force the top piece would have actually experienced in a fall. If you want, I can tell you where you can get a portable load cell analyzer that can be powered off of a laptop and a 5,000 lbs load cell for under $600.

If you look at my thread here:

http://www.rockclimbing.com/cgi-bin/forum/gforum.cgi?post=2574668;sb=post_latest_reply;so=ASC;forum_view=forum_view_collapsed;page=unread#unread

I used the load cell analyzer I am referencing to generate the data in that post.


(This post was edited by USnavy on May 2, 2012, 7:36 PM)



Edit Log:
Post edited by USnavy () on May 2, 2012, 7:23 PM
Post edited by USnavy () on May 2, 2012, 7:24 PM
Post edited by USnavy () on May 2, 2012, 7:24 PM
Post edited by USnavy () on May 2, 2012, 7:35 PM
Post edited by USnavy () on May 2, 2012, 7:36 PM


Search for (options)

Log In:

Username:
Password: Remember me:

Go Register
Go Lost Password?
$170.10 (10% off)
$34.16 (10% off)
$3.56 (10% off)
$17.95 (10% off)