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LS Dyna

LS Dyna

Topics related to LS-DYNA, Autodyn, Explicit STR and more.
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  3. Piping Stress Analysis using *ELEMENT_BEAM_ELBOW

Piping Stress Analysis using *ELEMENT_BEAM_ELBOW

    • December 12, 2025 at 1:52 am
      shnchlsn
      Subscriber

      I was trying to figure out LS-DYNA would be available for piping stress analysis using Elbow Beam.

      So, I made two models for the comparison between regular beam (ELFORM = 1) and elbow beam (ELFORM = 14) under *LOAD_BODY_Y with structural mass only.

      I guess the deformed configuration of the regular beam seems reasonable while one of the elbow beam unrealistic.

      I know elbow element is still in beta but I think I have to use elbow element to incorporate the pressure stiffening effect into the analysis.

      Is it a bad idea to use LS-DYNA for piping stress analysis for now?

      By the way, I have found the NSM field in *SECTION_BEAM for elbow element would not work properly. I got a overestimated physical mass in "messag" file.

      Pasted Graphic 10.pngPasted Graphic 55.png

    • December 12, 2025 at 2:36 am
      shnchlsn
      Subscriber

      I was trying to understand the configuration of elbow beam and there would be a reasonable way to understand is the pressure stiffening effect make the bend section straight, even though I put 0 value on the PR in *SECTION_BEAM for elbow beam.
      I saw the bug when PR = 0 was fixed but I am not so sure it is right.

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