How to calculate average stress?

  • Thread starter physea
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  • #1
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hello!

In the question below, is the average normal force in order to calculate the average normal stress, 8sin60 or 16sin60 or 0?

https://www.physicsforums.com/attachments/stress-jpg.100364/

thanks!
 

Answers and Replies

  • #2
61
22
Might be just me, but i can't open that image.
 
  • #3
211
3
OK the free body diagram is this;

upload_2016-5-7_2-48-56.png
 
  • #4
61
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What do you think it is
 
  • #5
211
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I think it's zero, because at that point, the two opposite forces are cancelling each other
 
  • #6
berkeman
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I think it's zero, because at that point, the two opposite forces are cancelling each other
The stress is not zero because there are forces pulling the bar apart.
 
  • #7
SteamKing
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I think it's zero, because at that point, the two opposite forces are cancelling each other
Ask this guy if the stress is zero:


10919259-Man-Being-Tortured-On-The-Rack-Stock-Photo-torture-rack.jpg

 
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  • #8
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ok then it's 16sin60
 
  • #9
SteamKing
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ok then it's 16sin60
No, it isn't.

Where does the sin 60 come from?

Do you know what the definition of "stress" is?
 

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