Is a solid cylinder considered thick or thin?

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SUMMARY

A solid cylinder with a diameter of 40mm and a length of 14mm is classified as a rod rather than a cylinder. The discussion clarifies that the criteria for determining whether a cylinder is considered thick or thin applies primarily to hollow cylinders, where the wall thickness is defined by the difference between inner and outer diameters. For solid objects, the concept of thickness is not applicable, and thus, the use of plane stress approximations may not be appropriate for a solid rod.

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  • Understanding of solid mechanics principles
  • Familiarity with plane stress and plane strain concepts
  • Knowledge of the definitions of thick and thin-walled cylinders
  • Basic geometry of cylinders and rods
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yonese
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I have a solid cylinder of diameter 40mm and length 14mm and I have used plane stress approximations in my calculations so far. I know for to assume a thin walled cylinder/tube the wall thickness needs to be less than 1/20 of tube or cylinder diameter. However, what I have found so far is that this 1/20 method applies to hollow cylinders where the thickness can be determined by the difference in the inner and outer diameter. How will I know whether my solid cylinder can be considered thin or thick? I'm guessing the length cannot be used as the thickness. Might it be that the thickness is ...0?

If my cylinder is to be considered thick, would plane stress approximations still be appropriate?

[Moderator's note: moved from a technical forum.]
 
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There is no such thing as a solid cylinder, what you have is a rod.
 

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