Hi all,
I have been trying to simulate implosion of a closed aluminum pipe for a few months. Inside the aluminum pipe is ambient air. Water and Air have been defined as ALE groups with Grüneisen and Linear Polynomial EOS respectively. The material properties for water and air are NULL and Solid ELFORM 11 is selected. The aluminum pipe is a shell with ISOTROPIC_ELASTIC_PLASTIC properties and is fixed on both ends. Lagrange in Solid is enabled for the constrained. Control ALE, Energy and Termination are added. In addition, Hourglass for the ALE Parts and the Shell part has been changed. Under Database ASCII Options (MATSUM, TRIHIST, GLSTAT), Binary_D3PLOT, FSI, and Tracer are selected.
I have tried a few methods to get the pressure in the water to increase and collapse the aluminum. First I tried defining a curve and directly applying a force on the surface of the water from all directions. The water is a box with a hole in it for the air. Nothing happened. Then I tried to create a rigid plate to move down on the water from the top and fixed the water box. I got a pressure profile but the aluminum pipe does not deform. I have even tried to change my water domain to a cylinder but it was harder to apply a force that mimics pressure in all directions.
I am trying to replicate hydrostatic pressure in a way, but I would hope to just get my pipe to damage due to the water. I was not able to find much in the manual or online presentations that have information.
Thank you,
Jonathan