Beam elements

[Manuel Umanzor]

Hello group,

I am trying to get acquainted with the use of beam elements in LS-DYNA, for this purpose I created a simple model with several interconnected beams, and I am interest on studying a formulation with circular cross-section, e., g., ELEFORM=2 with STYPE=SECTION_8, however my job ends in error termination with the following message:

"ls dyna error error 20225 (str+225) orientation node for beam element # 29991 is undefined"

So I decided to try the Hughes-Liu formulation (ELEFORM=1) and set the cross-section as tubular with ID=0, and the job runs fine. This tells me that my application of the  Belytschko-Schwer formulation is incorrect, so I am wondering if there is a way to define the orientations in order to fix the error messages.

Thank you in advance,

Manuel

[l...@schwer.net]

I believe you should be using the CST parameter on *SECTION_BEAM rather than invoking STYPE via *ELEMENT_BEAM_SECTION.

Then CST=1.0 will provide a tubular cross section without the need of an orientation node (N3); see the User Manual Volume I,             --len

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