Question

What is the governing ratio for thin walled cylinders?

Answer 1

The governing ratio for thin walled cylinders is 10 if you use the radius. So if you divide the cylinder´s radius by its thickness and your result is more than 10, then you can use the thin walled cylinder stress formulas, in other words:

• if
  `(radius)/(thickness) >10` then you have a thin walled cylinder

or using the diameter:

• if
  `(diameter)/(thickness) >20` then you have a thin walled cylinder