{"id":345561,"date":"2024-01-19T13:27:29","date_gmt":"2024-01-19T13:27:29","guid":{"rendered":"\/forum\/forums\/topic\/how-to-evaluate-absorbed-energy-in-a-static-analysis\/"},"modified":"2024-01-19T13:27:29","modified_gmt":"2024-01-19T13:27:29","slug":"how-to-evaluate-absorbed-energy-in-a-static-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-evaluate-absorbed-energy-in-a-static-analysis\/","title":{"rendered":"How to evaluate absorbed energy in a static analysis"},"content":{"rendered":"

Hello Ansys community,<\/p>\n

I am working on a project of a pressure cell, and more specifically on a safety device in case the cell fails. A very simplified sketch of the design is represented below:<\/p>\n

<\/p>\n

The green part is screwed into the blue one and the gap between them is filled with water and pressurized up to 1 GPa. The thin greyed part is a safety cage that should catch the green plug in case the thread fails and the plug is ejected. The cage is also fixed to the cell by means of screws, but I would like to rely on the deformation of this cage to absorb the energy of the impact, and not on the screws.<\/p>\n

The distance between green plug and cage is rather short, so I am considering that from the moment the plug is ejected until it reaches the cage there is no loss in energy. I am now trying to simulate only the cage, and the only information I have that could be used as an input is the plug kinetic energy.<\/p>\n

So my question is: how to set this model up? I do have a strategy, but I am not sure if this makes sense or not:<\/p>\n

    \n
  1. I am using fixed support on the “feet” of the cage.<\/li>\n
  2. I am applying an arbitrary displacement on the region that would receive the impact, and setting the analysis to run in several substeps.<\/li>\n
  3. for each substep, I evaluate the Total Strain Energy.<\/li>\n
  4. If the total strain energy increases above the kinetic energy I have calculated for the plug, then I consider that all the impact was absorbed.<\/li>\n<\/ol>\n

    Does that make sense for you? Do you have a suggestion on another approach to this problem?<\/p>\n

    I have also other questions related to that, such as is it ok to use shell elements for the cage? Is the fixed support a good approach? How could I set the boundary conditions up in a better way?<\/p>\n

    I appreciate any comments and suggestions, and I am looking forward to hearing from you.<\/p>\n

    Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-345561","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t