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<p>[QUOTE=&quot;Hobo, post: 1105829, member: 11521&quot;]The term is &#039;metal fatigue&#039;. I know a thing or two about the strength of metals (I am a structural engineer) but I am not a metalurgist. I can tell you that when metal is stressed beyond its maximum strength it can fail quickly (e.g., a building or bridge collapsing) but when metal is stressed below its maximum strength repeatedly it can eventually fail due to metal fatigue. (A good example of metal fatigue is Aloha Airlines Flight 243 that &quot;popped its top&quot; due to metal fatigue. The plane was essentially a puddle hopper which means it is a LOT of takeoffs and landings and not a lot of hours landing. Therefore the cabin was pressurized and depressurized many more times than planes that had longer routes. Over time the top of the cabin was weakened due to metal fatigue and during a flight one day in 1988 a large portion of the cabin roof flew off. A flight attendant was sucked out to her death.)</p><p>&nbsp;</p><p>I lifted this definition from Wikipedia:&nbsp; </p><p>&nbsp;</p><p>metal fatigue - and localized structural damage that occurs when a material is subjected to cyclic loading[/QUOTE]</p><p><br /></p>

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