ETS recordings · Paul A. Tres

Safety factors over time

Using creep data to engineer a safety factor that decays to exactly one at the end of warranty — not before.

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Alright, the next subject matter I would like to cover for you is safety factors as they relate to time. Here we could use creep data to be able to forecast or tell, foretell, what the warranty period for a plastic part is. A plastic part behaves like us, like humans. One day was the birth of the part, time zero. And at the other end, spectrum, we have the death of the plastic part, the end of warranty, when time, its end. Our job as designer is to guess, I don't like to use that word, is to engineer what a safety factor greater than one should be at time zero,

such that this number decreases in time until it reaches one, which is like Russian roulette. At time zero. And at time one, when the part fails.

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