2D SHELL Elements Formulation 14 and 15

[Akhil Sreekumar]

Hallo Everyone,

i am doing a simulation using 2d Shell elements and the element formulation that i have used for that are 13,14 and 15. this is an axisymmetric case so i have read in ls dyna websites and in source manual to use 14 and 15 but its not working, i would like to know why ? and if there is a solution for that.

I have given the shell thickness as 1. the model is axisymmetric about axis Y and Element normals are Normal to positive Z axis as well.

I am getting negative volume error on ELFORM 14 and 15.

Kindly help if anyone has any information or experience regarding this situation.

Best Regards

Akhil

[James Kennedy]

Dear Akhil,

 

Please see the following notes.

 

https://ftp.lstc.com/anonymous/outgoing/support/FAQ/2d_general_cond

 

-------------------------------

 

*SECTION_BEAM

 

ELFORM -  Element formulation options:

 

EQ.8: 2D axisymmetric volume weighted shell element (__-plane, _-axis of symmetry)

 

Note that the 2D and 3D element types must not be mixed, and different types of 2D

elements must not be used together. For example, the plane strain element type must not

be used with the axisymmetric element type. In 3D the different beam elements types,

that is, 1-6 and 9 can be freely mixed together.

 

Sincerely,

James M. Kennedy

KBS2 Inc.

September 27, 2023

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