On our engineering specification for piping flexibility, I found below sentence but I have no idea how to handle this.

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when external loading and internal pressure are imposed simultaneously on a pipe bend, the maximum circumferential stresses occuring for external moment loading shall be reduced by the presence of internal pressure (Bourdon Effect)
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Does anybody have an idea how to apply Bourdon Effect using Caesar II?

Hi Ros,

You can control Bourdon by seting your config. file in computational cont. and in the special execution on... and if you have a problem you can always press F1 when you highlight the parameter and if you have futher question with bourdon effect you can always search "bourdon effect" and you will have lots of discussion on the subject..

Regards!

hi
bom i have question about bourdon effect
that if we activate bourdon effect in caesar ii
than how it is calculate stresses
there are two option
1)tranverse only
2)transverse+rotation
what is that mean

Search the newsletters , you will find a an atricle addressing this topic. Also, if you have FEPipe , you can read about this topic in FEPipe program manual. CAEPIPE website has also some discussion on this subject.

Regards

Have you tried pressing F1?

Regards!

The expression 'Bourdon effect' is frequently applied to elongation of pipe under internal pressure. This is not quite correct. Bourdon effect is the rotation of a NON-CIRCULAR CROSS SECTION element such as a bend under pressure. Pulled elbows tend to be oval in cross section and would experience this rotation. In a pressure gauge a 'very oval' section of tube is pressurised and the end deflection drives the indicator, thus the name 'bourdon gauge'. Caesar gives you the option of including translation and / or rotation of bend elements in calculations. Both can have a serious impact on piping and should be considered carefully. Internal pressure also stiffens elbows, reducing flexibility (k)factor and stress intensification (i) factor, as RoS refers to above. This is referenced in for example, ASME B31.3 note 7 to Appendix D table D300, component stress intensification and flexibility factors.