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I don't know about how cold deep artic waters may be (I doubt that much), but strength-stress curves are likely why. The easiest way to make something last long
by Nasrudith 5y ago
I don't know about how cold deep artic waters may be (I doubt that much), but strength-stress curves are likely why. The easiest way to make something last long and not have unexpected accidents is to overrate it big time - such that any wear would need to become blatant.
To take an ergonomically silly exampke shovel handle could be a three inch diameter of solid steel that can take five metric tons per square centimeter as pressure without bending. If it wears out enough that it could snap by human body weight it would have to be worn quite a bit.
- jhgb 5y agoSalt water won't go much below zero. At oceanic salinity levels I doubt there's any place with liquid water below -2C.
- soco 5y agoSubmarines don't stay all the time under water.
- jhgb 5y agoThey're designed to spend as much time under water as possible (i.e., months, basically). That's the whole reason for nuclear power on submarines.
- soco 5y agoThe official requirement of the US Navy seems to disagree and I tend to trust they know better than us what they design their gadgets for. The metallurgist also thought they knew better, because they're operating submarines for their lives... oh wait.
- jhgb 5y agoWe have no knowledge of what those castings were used for. It's impossible to judge whether the requirement for these parts was excessive/copy-pasted, or not, and if it was, then by how much.
- soco 5y agoOkay I think I understand now where you're coming from and it was answered somewhere else in this discussion: when we receive a weird requirement we can ask for confirmation and clarifications and even express disagreement, but we will implement it after all that. Anything else would be at least disingenuous, if not worse.
- tyingq 5y agoI'm curious what the requirement was for, and why she thought it was stupid. Nothing justifies how she just skipped it, but it is interesting that she did, and how long it went undiscovered.