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Forums:
Climbing Information:
The Lab:
Rope - Minimum Breaking Strength:
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summerprophet
May 18, 2009, 9:16 PM
Views: 13613
Registered: Jan 17, 2004
Posts: 764
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Recently I was involved in a discussion in another thread regarding rope strengths.
I know that I have been taught for rigging that assume the rope has a strength of 30kN and build all systems to be as strong or stronger.
Those opposed to my statements brought up test data of static loading being able to break ropes in the 8 kN range.
It was my understanding that this give erronius data as this is not the situations in which dynamic ropes are used.
My question is this? Why is the data erronius?
I am guessing here, but perhaps someone with more of a physics background can set me right.
Is it this? Static pull testing is bases upon minimum deformation of the sample (before failure), to obtain accurate results. And the very nature of climbing ropes is to deform under load, thus from the very beginning of the test, the data is incorrect.
I know the UIAA does not use static testing at all for climbing ropes, everything is dynamic loads.
Anyone care to educate me on this further?
(This post was edited by summerprophet on May 18, 2009, 9:18 PM)
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Post edited by summerprophet
() on May 18, 2009, 9:18 PM
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