Tube Strength charactoristics

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SUMMARY

This discussion focuses on calculating the load-bearing strength differences between hollow tubes and solid tubes with a uniform cross-section, specifically in the context of designing space frame chassis for vehicles. Key formulas mentioned include the calculation of stress using σ = M/Z, where σ represents stress, M is the applied moment, and Z is the section modulus. The conversation highlights that while compression strength may be similar for both types, significant differences in load-bearing strength along the length of the tubes are expected, particularly at points of reduced cross-section and potential stress concentrations.

PREREQUISITES
  • Understanding of sectional modulus and its calculation
  • Familiarity with stress analysis in structural engineering
  • Knowledge of load-bearing characteristics of materials
  • Basic principles of vehicle chassis design
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  • Research the calculation of section modulus for different tube geometries
  • Learn about stress concentration factors in structural components
  • Explore finite element analysis (FEA) tools for stress testing designs
  • Investigate material properties relevant to hollow versus solid tubes
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Engineers, vehicle designers, and students in mechanical or structural engineering who are involved in chassis design and analysis of load-bearing structures.

pharllap
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How would i work out the load baring strength difference between a hollow tube and a tube, with a x section throughout the length?(as per thread bellow)

http://i323.photobucket.com/albums/nn463/pharllap/endview.jpg

I love designing things and in this case I'm asking in respect to space frame chassis for vehicle.

Strength is broad question and thinking compression strength form the end be similar to hollow, however load baring strength along the length I'm thinking should be a substantial difference..
Any help greatly appreciated

Regards Phil(Perth, OZ)
 
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by calculating the sectional modulus for both cross sections
σ = M/Z
σ = stress induced
M = Moment applied
Z = section modulus
 
pharllap said:
How would i work out the load baring strength difference between a hollow tube and a tube, with a x section throughout the length?(as per thread bellow)

http://i323.photobucket.com/albums/nn463/pharllap/endview.jpg

I love designing things and in this case I'm asking in respect to space frame chassis for vehicle.

Strength is broad question and thinking compression strength form the end be similar to hollow, however load baring strength along the length I'm thinking should be a substantial difference..
Any help greatly appreciated

Regards Phil(Perth, OZ)

what you want to ask is how the stress varies along the axis of the vessel. I think the weakest part will occur where you have the smallest X-section, like in the hollow part. However, stress concentration at sharp corners in the transverse cross-section may also exist.
 

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