Mechanical Engineering Streeses

  • #1
Mechanical Engineering Stresses

I am really struggling with the following problem:

A rectangular tube with no given length has the dimensions shown in the diagram (within the attachment). Find the maximum tensile and compressive stresses that such a section will experience due to a bending moment of 20KNm.

The attachment should be included if Ive done it right.

I think i should be using "Second moments of area", but I'm not sure some clarification and possibly the formula would be gratefully received.

Thank you

Chris:confused:
 

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Answers and Replies

  • #2
FredGarvin
Science Advisor
5,066
9
What's the definition (mathematical) of normal stress due to a bending moment?
 
  • #3
how is the bending moment applied? is the bar in torsion?
 
  • #4
31
0
That tube works as a beam. From here, Google is your friend.
 
  • #6
CPP
8
0
think about the neutral axis and which side is in tension/compression then use the stress equation for a beam in symmetric (assuming) bending. simple. but I've done it a few times.
 
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