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### Clavarinos equation thick-walled cylinders of ductile material Calculator and formula

**Fluids Engineering and Design**

**Pressure Vessels Design and Engineering **

**Thick-walled Cylinders of Ductile Material, Closed Ends Clavarino's Formula and Calculator**

**Clavarino's** formula is applicable to cylinders with closed ends made of ductile materials. Maximum principal strain theory is taken in this case

Pressure. In designing a cylinder to
withstand internal pressure, the choice of formula to be used depends on:

1) the kind of
material of which the cylinder is made (whether brittle or ductile);

2) the construction of
the cylinder ends (whether open or closed); and

3) whether the cylinder is classed as a
thin- or a thick-walled cylinder.

A cylinder is considered to be thin-walled when the ratio of wall thickness to inside diameter is 0.1 or less and thick-walled when this ratio is greater than 0.1. Materials such as cast iron, hard steel, and cast aluminum are considered to be brittle materials; low-carbon steel, brass, bronze, etc. are considered to be ductile.

Preview: **Clavarino's equation thick-walled cylinders of ductile material Calculator**

Where:

p = internal pressure, psi;

D = inside diameter of cylinder,
inches;

t = wall thickness of cylinder, inches;

S = allowable tensile stress, psi.

μ = Poisson’s ratio, = 0.3 for steel, 0.26 for
cast iron, 0.34 for aluminum and brass;

If metric SI units are used, then:

p = internal pressure in newtons per square meter

D = internal diameter of shell in meter

S = safe tensile stress in newtons per square meter

t = thickness of metal in the shell, in meter

Reference: Machinerys Handbook 30th Edition

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