Mechanical Engineering Streeses

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SUMMARY

The discussion focuses on calculating maximum tensile and compressive stresses in a rectangular tube subjected to a bending moment of 20 kNm. Participants emphasize the importance of understanding the second moment of area and the definition of normal stress due to bending moments. Key resources provided include links to Wikipedia articles on bending and area moment of inertia, which are essential for grasping the concepts involved. The conversation highlights the necessity of identifying the neutral axis to determine which side of the beam experiences tension and compression.

PREREQUISITES
  • Understanding of normal stress in mechanical engineering
  • Familiarity with the second moment of area
  • Knowledge of bending moments and their applications
  • Basic principles of beam theory
NEXT STEPS
  • Study the calculation of the second moment of area for various shapes
  • Learn about the stress equation for beams under symmetric bending
  • Explore the concept of the neutral axis in beam bending
  • Review practical examples of bending moment applications in mechanical engineering
USEFUL FOR

Mechanical engineers, students studying structural analysis, and professionals involved in designing and analyzing beam structures will benefit from this discussion.

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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