Creep and plastic ratcheting

Simplified estimation of the hold backs of the creep and plastic ratchting of pipes


Attention!

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


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Input data:

Inside radius  mm
Outside radius  mm
Elasticity module E  N/mm²
Yield stress Sy  N/mm²
Viscosity γ 
Thermal expansion  K–1
Stress exponent n* 
Creep constant k*  MPa–n·H.–1
Tractive power  kN
Outside wall temperature  °C
Inside wall temperature  °C
Calculation time  H.

* according to Nortons law: dε / dt = k · σn
Sketch: