How to measure stress/tension on a rope?

I haven't seen all of this post, but the answer seems obvious.

Deflect the rope with a roller, bewtween two other rollers. Measure the force on the deflecting roller perpendicular to the rope. This could be fitted to a rope without cutting it.

Andrew M

I didn't bother to read all of this post, but if the answer seems obvious, it's likely that someone has already proposed what you did. I guess we'll never know.

Mitch

The tighter the rope the higher resonant frequency becomes like stretching an elastic band. It would require something to give it a twang and a microhone to pick up the resulting ringing.

----------------------------------------------------------------------- Ashley Clarke

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Here's something that the OP may be interested in.

I dont know the maths (too long ago when I did this sort of thing) but surely applying a force to the object that moves it a distance by a transducer then you can calculate the weight of the object - eg m=force x distance or something - then by measuring the period of the swing you can calculate the length of the string.rope and by using a lazer 'device' measure the diam of the rope/wire etc you can calculate it own weight (or close to it) - then the stress etc becomes the sum of the object plus the weight of the string

Or am I just rambling?

David - who loved physics but was h> T> > (a) Imagine an 5-100kg (we do not know exact weight) object is hanged with a

Exactly - The 3 sheave dynomometer. This method has been used in cranes for years to measure the weight on the end of the hook.

Andy