Learning Forum

[Taishi Sato]

Hello, all

I am researching hypervelocity impact phenomena and would like to introduce the SPH-FEM method in Autodyn 2D. 

As shown in the figure below, the projectile and the lower half of the target, which undergoes large deformation due to impact, are packed with SPH particles, and the remaining upper half of the target and the surrounding frame are meshed. Then, when I performed a calculation by joining all the parts using "Join" in the "Setup" menu, unintended destruction occurred near the boundary between SPH and FEM. How can I solve this? Do I need to apply contact conditions? If so, how can I do this? I also tried using "edge packing" on the target side, but the result was the same.

I am using the academic version of Autodyn 19.2.

[Chris Quan]

You need to click on Joins on the left navigation menu to join the SPH object to Lagrange parts. The SPH particles have to be generated with Edge Packing so they can be placed on the boundary of Lagrange parts. 

On the interface edge of a Lagrange element with SPH particles, you should place two or more SPH particles for a single Lagrange element.

Finally, you can check the box of Joins under Additional Components to plot joins and make sure the Join setup is correct.