Creep and plastic ratcheting

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

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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:

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