Quote:
Originally Posted by bcredliner
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I read the whole article. Very good read. I was saying the same thing regarding if it's ok to reuse a bolt. All my "it is ok" math is based on don't exceed proof load.
I did my first exam of an old bolt today but since I don't have the "before" nothing conclusive yet, but preliminary measurements suggest the bolts are actually strained past proof, and would have a cycle lifespan like the above article explains. (Eg ok to use 5 times).
I've only measured the bolt after use and I measured a slightly lower than expected thread pitch.
Over the first 9mm the threads seem to line up on a 2/3 thread per mm or 1.5mm/thread as expected.
But at 36mm (24 threads), it's clearly about 36.2 mm or 1/2% elongated.
That does strongly suggest the TTA torque is also TTY.
I'm getting excited to get some measurements made