Hello,

I would like to know if Caesar II considers the deformation of elbow (elliptical).
thank you
stephane

Hi Stephane,
Did you mean the elbow stiffness? If a rigid element (flange, valve) is attached near elbow, then specify the bend as single flanged (or double flanged whichever the case maybe). This is the requirement of most piping codes to consider the effect on stiffness of elbow. Caesar-2 will not tell that elbow is deformed in elliptical shape or not because the program is based on bending theory; it will only verify that bending stress is within the allowable or not. I suggest to use FEA program if you need to investigate the behavior of elbow during bending.

Hi Yhebostress,

Thank you for your answer,
Specifically, I want to know the influance on forces when an elbow work on opening or closing.
I made some tests with an elbow that work on opening and on closing (the same configuration of the pipe). I find different forces on the anchor nearby. I thought it was due to deformation of elbow.
Thank you
stephane

Hi Stephane,

Can you elaborate please what did you mean about "opening or closing"?

Hi Yhebostress,

I will try explain to you.
If i consider the angle of elbow is 90° without temperature. With the temperature the angle of elbow is >90° so i consider that the elbow work on opening. And if the angle of elbow is <90° i consider that the elbow work on closing.
Do you understand?
Stephane

Stephane,

No, CAESAR II does not consider this. CAESAR II performs a linear elastic analysis - one of the assumptions is that the cross section does not change. This goes for bend cross sections also. In addition, the bend angle is assumed to remain constant during the analysis.

@Richard:

What about the bend angle in rotational Bourdon effect.
Cannt Caesar use the same concept/simulation for the thermal growth?

Thank you Richard for your answer.