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Axisymmetric element

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Posts: 14
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(@sheida)
Paid Intern
Joined: 3 years ago

Hi all,

I am trying to use four-node, 2D axisymmetric elements to model the impact between a projectile and a plate. I have not found any similar example of axisymmetric elements to get the idea. I have a few questions that I would appreciate it if anyone can help me with:

1- Should I use the "2D Mesher" tool in LS-DYNA to start with?

2- In card 1 of *SECTION_SHELL, ELFORM=14,15, what is the difference between area-weighted and volume-weighted conceptually?

3- Do I have to use EOS? I saw an example of Axisymmetric modelling of blast wave development on youtube, which is very different from mine, and I got familiar with this option and found that situations that call for an EOS are characterized by very high strain rates, so I thought maybe I should consider it.

 

Thank you,

Sheida

 

2 Replies




Posts: 36
(@geardyn-1)
Lab Tech
Joined: 4 years ago

impact between a projectile and a plate is highly non-linear problem and requires a great care to achieve convergence . instead of using 2D axisymmetric elements, its better to use 3-D elements with planar symmetry approach ( quarter model - instead of full model) with hourglass control.

Eos is required to the target plate since the deformation and the dynamics of the penetration is based on the stress waves in solid, and as mentioned high strain rates involved

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1 Reply
(@sheida)
Joined: 3 years ago

Paid Intern
Posts: 14

@geardyn-1 Thank you for your reply. 

I had created a 3D model before, but I had not used EOS in my model. I will apply it then.

I could not validate my previous 3D model with the experimental data, so I decided to use 2D axisymmetric elements because there were a lot of papers that modeled it in this way and seemed successful to validate their numerical simulations with experimental results, so I thought maybe I can try it.

 

Thank you,

Sheida

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