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The Water Cooler
General Discussion
Helical Spring lockwashers- have you ever used them? I bet you have
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<blockquote data-quote="joegrizzy" data-source="post: 3928772" data-attributes="member: 45524"><p>could have been a number of reasons. without knowing more information, i would ask:</p><p></p><p>>how long were the grade 8 bolts used in that application?</p><p>>were they exposed to a higher amount of force than the other bolts (very heavy load dumped into bed, took out a curb, etc etc)?</p><p>>were they exposed to higher concentrations of road salts?</p><p>>were they zinced, nickel, galvanized, stainless?</p><p></p><p>like i said earlier, the yield curve of gr5 will show that it will fatigue as it stresses and begin to deform prior to failure for a longer period than gr8 will. however, the *amount* of force to overcome a gr8 would be more than the gr5 would theoretically hold, so that should be moot.</p><p></p><p>the line of thinking there is; you notice a complete failure and breakage of the bolt/shearing, but you might not notice a bit of fatigue deformation over time. again, this is kinda into the wives tale territory, but there's lots of wild things that likely we simply still don't fully understand about metallurgy/real world physics interactions/engineering or at the end of the day people lie.</p><p></p><p>i worked in fastener distribution for years and saw several things that weren't really explainable past the proverbial "you got a bad one".</p><p></p><p>lets just say i did a LOT of lot tracing.</p></blockquote><p></p>
[QUOTE="joegrizzy, post: 3928772, member: 45524"] could have been a number of reasons. without knowing more information, i would ask: >how long were the grade 8 bolts used in that application? >were they exposed to a higher amount of force than the other bolts (very heavy load dumped into bed, took out a curb, etc etc)? >were they exposed to higher concentrations of road salts? >were they zinced, nickel, galvanized, stainless? like i said earlier, the yield curve of gr5 will show that it will fatigue as it stresses and begin to deform prior to failure for a longer period than gr8 will. however, the *amount* of force to overcome a gr8 would be more than the gr5 would theoretically hold, so that should be moot. the line of thinking there is; you notice a complete failure and breakage of the bolt/shearing, but you might not notice a bit of fatigue deformation over time. again, this is kinda into the wives tale territory, but there's lots of wild things that likely we simply still don't fully understand about metallurgy/real world physics interactions/engineering or at the end of the day people lie. i worked in fastener distribution for years and saw several things that weren't really explainable past the proverbial "you got a bad one". lets just say i did a LOT of lot tracing. [/QUOTE]
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