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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Need some help in *ELEMENT_BEAM_ELBOW › Reply To: Need some help in *ELEMENT_BEAM_ELBOW

November 22, 2023 at 3:03 am
mmia1
Subscriber

 

Hi

Thank for the clarification. But still my model with *ELEMENT_BEAM_ELBOW using LSDyna gave me high von misses stresses compared to expected results (about 10 times higher). I followed the manual to model elbow and straight pipes. However, still no improvement. Details of the model and section and integration beam info can be found in my previous post of November 15, 2023, at 9:59 pm in this thread. Could anyone suggest me what I might do wrong? My material model is as below if anyone is interested.

*MAT_PLASTIC_KINEMATIC
$#     mid           ro                e               pr          sigy           etan          beta 
         1 7.900E+03 2.070E+11  0.300000  2.07E+08  2.00E+09  0.000000
$#     src       srp        fs        vp
     0.000     0.000     0.000     0.000

(UNITS: N,m,s)

In another note, if I used regular beam elements (Elform =1) for both straight pipes and elbow, I got the expected results although I am not sure if is it okay to use regular beam elements (Elform =1) to model curved pipe instead of available *ELEMENT_BEAM_ELBOW element in LSDyna.

I would really appreciate if anyone can help me. Some of my colleagues said that regular beam elements (ELFORM=1) has some drawbacks in modeling elbow that’s why LSDyna introduced elbow elements, although they could not provide me any proof of that. Please help me in this regard. Thanks again.

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