Stress result

Dear Sirs,

In AutoPIPE, how can I know a stress (sustained, expansion) at a point is compression or tension? All of the stress in the result grid are positive so I cant know by its sign (- or +).

And if a pipe is bent, the stress will be tension in 1 side and compression in another side, so how can I know it?

Thanks very much!

  • Maybe the compression or tension stresses can't be defined but what about the directions. Sustained - as I know it is axial stress caused by GR and P, Hoop stress is circumferential, but what about expansion, Operating?

    Does anyone know? Please help me, I have a meeting tomorrow and the questions will be asked ^^

    I will be very appreciated!!!

  • Dear,

    I have just found that in B31.8, and General codes, the Min long, Max long, shear, hoop, etc. All kinds of stress are shown, but why in B31.3 and some others are not?

    Thanks!

    Flashing

  • :(

    It seems that everyone is busy! But I have found the reason why AutoPIPE provides Sustained, Expansion, etc. But it doesn't mention clearly about stress components which include shear, axial and hoop.

    I am doing B31.3 so the result grid doesn't show shear, hoop, axial stresses. Is there anyway that i could get them in AutoPIPE (under all load combination GR+P+T)? Because it will need for our crack evaluation (you know the different component will affect deferentially to the phenomenon).

    Thank very much.

  • Hello Flashing, 

    Suggest that you take time to review the following help section for the various codes that you are considering:

    Please see the following AutoPIPE help section:
    Help > Contents button> Contents Tab> Reference Information> Code Compliance Calculations> select a code and category

    These sections will provide details information on the calculations being performed by the program

    Afterwards you will clearly see that they General Piping code has combinations that requires all the other components you mentioned (Min long, Max long, shear, hoop, etc) in order to correctly calculate the reported total stress value.

    Conversely, other codes, like ASME B31.3, have different requirements for calculating the various code combination stress results.

    Regards,

    Mike Dattilio
    Bentley Systems Design Analyst
    Design Engineering Analysis group
    ===================================================

    Answer Verified By: Mike Dattilio 

  • Hello Flashing, 

    When analyzing with ASME B31.3, there are 2 different output report / grid sections: 

    1. General Stress

    2. Code Compliance / Stress

    The General Stress report has all the information that you are talking about for non-code combinations. While the Code compliance report has has all the requirements for code calculations. 

    See  image below:

    Regards,

    Mike Dattilio
    Bentley Systems Design Analyst
    Design Engineering Analysis group
    ===================================================