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
d
a
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 · σ
n
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)