Author Topic: Misconceptions people have that you'd like to correct.  (Read 11173 times)

robartsd

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Re: Misconceptions people have that you'd like to correct.
« Reply #200 on: November 13, 2017, 03:41:38 PM »
Misconception:  Things have to melt in order to loose strength.
https://www.engineeringtoolbox.com/metal-temperature-strength-d_1353.html 

 TL;Dr steel is at ~20% strength at 1500F

If this wasn't the case, then blacksmiths couldn't work metal at less than melting point (and would have a tough time working a liquid if it was at or greater than melting).

So unless structural steel is used with a factor of 5 safety margin, then 20% of original strength will fail.
"Buildings commonly use a factor of safety of 2.0 for each structural member. " per https://en.wikipedia.org/wiki/Factor_of_safety
Way to bring this thread back to misconceptions!