2065x
001102
2015-09-07

Internal Pressure of Pipe Members

The stresses due to internal pressure are calculated as follows:
Medium perimeter stress σu = (p × di) / (2 × s)
Longitudinal stress σx = (p × di2) / (4 × s × (di + s))

Where:
p = internal pressure
di = internal diameter
s = wall thickness

Generally, these stresses due to internal pressure have no effect on the deformation. Only after you activate the "Bourdon" effect in the calculation parameters does the longitudinal strain apply (considering the transversal strain), depending on the axial stress, perimeter stress, and corresponding material stiffness. In this case, the positive internal pressure leads to an extension of the member element. If the member element is fixed elastically or rigidly on both sides, the extension leads from the internal pressure to a forced load, which induces additional internal forces.


Author

Mr. Niemeier is responsible for the development of RFEM, RSTAB, RWIND Simulation, and in the area of membrane structures. He is also responsible for quality assurance and customer support.

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