Mechanical Engineering Streeses

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To determine the maximum tensile and compressive stresses in a rectangular tube under a bending moment of 20 kNm, the second moment of area is essential for calculations. The normal stress due to bending can be defined mathematically, and it is crucial to identify the neutral axis to determine which side of the beam experiences tension and which side experiences compression. The bending moment is applied along the length of the beam, and it is important to consider whether the tube is also subjected to torsion. Utilizing resources like Wikipedia can provide additional clarity on the concepts of bending and area moment of inertia. Understanding these principles will aid in accurately calculating the stresses involved.
chrisking2021
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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 I've 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:
 

Attachments

  • Example diagram.JPG
    Example diagram.JPG
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What's the definition (mathematical) of normal stress due to a bending moment?
 
how is the bending moment applied? is the bar in torsion?
 
That tube works as a beam. From here, Google is your friend.
 
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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