Creeping of the cylinders

Creeping of a thin walled cylinder under inside pressure and axial load

Attention!

This calculation is only a simplified estimation, and does not replace a detailed design calculation.
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Input data:

Inside pressure P  bar
Axial force F  kN
Length of the cylinder L  mm
Outside diameter da  mm
Wall thickness t  mm
Elasticity module E  N/mm²
Poissonīs ratio ν 
Stress exponent n* 
Creeping constant k*  MPa–n·h.–1
Operating duration T  h.
Time step ΔT  h.
* according to Nortonīs law: dε / dt = k · σn
Sketch:

Material behaviour:





[1] - Bickel M.B., Ruitz C.: Pressure Vessel Design and Analysys, Mc. Millen, 1967
[2] - Odqvist's Invariants theory (e.g. Folke K.G. Odqvist, Jan Hult: Kriechfestigkeit metallischer Werkstoffe, Springer-Verlag, 1962)