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Topic Date User

Direct Loading of Dyneema Slings 14-Apr-2010 At 1:06:03 PM davepalethorpe

Message

>The stretch dynamics of dynema is identical to climbing rope. In both cases the peak force
>depends directly the height and the length of rope. The only difference is the 'stretchiness' of
>the material.

>"The significance of the fall factor is that, when a fall is arrested by a belayer, if the tension in
>the rope is assumed to develop according to Hooke's Law, then the maximum impact force of
>the fall depends only the climber's mass, the elasticity of the rope, and the fall factor. In
>particular, the maximum impact force does not depend on the length of the fall."

I thought that hookes law only applied providing the elastic limit of a material is not exceeded. Ok with a nice stretchy thing like a climbing rope, but I would have thought it would be an entirely different situation with a not so stretchy thing like dyneema. Then you would imagine that impact forces would increase with distance once you exceeded the elastic potential of the sling.... Happy to be proved wrong though...?!