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AutoPIPE Wiki 01. Fatigue analysis with AutoPIPE Harmonic analysis command
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                • 01. Fatigue analysis with AutoPIPE Harmonic analysis command
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    01. Fatigue analysis with AutoPIPE Harmonic analysis command

    Applies To
    Product(s): AutoPIPE
    Version(s): All
    Environment: N/A
    Area: Analysis
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    June 2015
    09.06.02.06

    Fatigue analysis with AutoPIPE Harmonic analysis command :

    AutoPIPE does not have cyclic type of stress, therefore need to add a new code combination with H1 by itself for the RPM of the harmonic from a rotation compressor:

    Combination Name = H1

    Description = Harmonic Load case #1 for RPM = xxx .  

    Combination method  = 1 Sum

    Category = Occasional,  

    Case = H1.

    Now, change the default "Allowable Stress" setting from "Automatic"  (typical 1.33 *Sa) to 6500 psi. In this case, because a compressor is high cycle fatigue, API-618 mentions using a value of 26000 psi peak to peak. Therefore, use half of that which is 13000 psi peak to peak or  to consider some SIF values typically would suggest using 13000/2 = 6500 psi for the Stress allowable.

    Therefore, 26000/2 for peak to peak, /2 assuming a weld stress factor = 2, because the piping codes are typically based on SIF while fatigue values are typically based on stress concentration factors and there is a factor of 2 between SIF and stress concentration factors

    AutoPIPE nuclear has a full fatigue analysis engine, however AutoPIPE Standard and Advance does not. This shortfall will be fixed in a future version of the application by enhancement CAE-CR-3268:  Add fatigue analysis for ASME piping codes.   

    See Also

    "Fatigue" load case

    Bentley AutoPIPE

    • harmonic
    • AutoPIPE
    • fatigue
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Fri, Jul 3 2015 10:58 AM
    • Mike Dattilio Last revision by Bentley Colleague Mike Dattilio
    • When: Mon, Jan 9 2017 5:04 PM
    • Revisions: 3
    • Comments: 0
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