Ya, good points. You certainly wouldn't want it to fatigue the materials like bending a plastic toothpick. I guess it would be interesting to take old strings that are being replaced and test the whole thing to breaking point. Then individual strands too.
I really don't think 500 is going to put the material through much of a test if 1800 is the breaking point. That would be like a tow strap being weaker after using it, which I don't think would be the case. I would like to assume that if a company is stretching strings under that much force, they have a good idea of how far away from breakage they are and what the implications are. I would think if there were problems with it we would hear endless stories (or even 1 story) of wbs failures.
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