Structure Analysis with both Beam and Shell elments

Numerical methods and mathematical models of Elmer
kevinarden
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Re: Structure Analysis with both Beam and Shell elments

Post by kevinarden » 06 May 2020, 17:49

update shell solver sif still produces a deflection of 500
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my_shell_case.sif
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kevinarden
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Re: Structure Analysis with both Beam and Shell elments

Post by kevinarden » 06 May 2020, 20:45

Realized I didn't have the updated shellsolver. Updated solver the deflection is at the correct value. 0.0132" same as beam solver.

I will clean up the study and post as an validation case study.
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my_shell_case.sif
(2.67 KiB) Downloaded 17 times

kevinarden
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Re: Structure Analysis with both Beam and Shell elments

Post by kevinarden » 07 May 2020, 12:55

Added final case study to contributed cases, for this problem the beam addition to shell solver is valid,

viewtopic.php?f=18&t=7058&p=22650#p22650

mika
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Re: Structure Analysis with both Beam and Shell elments

Post by mika » 07 May 2020, 14:08

Thanks for testing,

As an update I mention that partially nonlinear analysis can now be done with "Large Deflection = True". At the moment the beam sections can nevertheless add only linearly behaving stiffness to the combined model, so the nonlinearity arises from the shell part.

-- Mika

JamesMarine
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Re: Structure Analysis with both Beam and Shell elments

Post by JamesMarine » 20 May 2020, 12:29

mika wrote:
07 May 2020, 14:08
Thanks for testing,

As an update I mention that partially nonlinear analysis can now be done with "Large Deflection = True". At the moment the beam sections can nevertheless add only linearly behaving stiffness to the combined model, so the nonlinearity arises from the shell part.

-- Mika
Many thanks! This seems working well regarding the test case. i will try to compare a more complicated model with original file in bdf analysised with nastran. Will try to compare the differences and revert back.

JamesMarine
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Re: Structure Analysis with both Beam and Shell elments

Post by JamesMarine » 05 Jun 2020, 11:12

Mika, if you don't mind, i have another question regarding shell/beam coupled solvers: does our beam solver support asymmetric beam properties?

As you may understand, beam with asymmetric properties is quite common.
mika wrote:
07 May 2020, 14:08
Thanks for testing,

As an update I mention that partially nonlinear analysis can now be done with "Large Deflection = True". At the moment the beam sections can nevertheless add only linearly behaving stiffness to the combined model, so the nonlinearity arises from the shell part.

-- Mika

mika
Posts: 155
Joined: 15 Sep 2009, 07:44

Re: Structure Analysis with both Beam and Shell elments

Post by mika » 08 Jun 2020, 17:15

Only the second moments of area ("Second Moment of Area 2" and "Second Moment of Area 3") may currently be asymmetric to produce asymmetric response with respect to bending.

-- Mika

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