Modeling a plastic ball and compressed air inside it

- January 6, 2023 at 9:52 pm
  
  Amirhosein Heydari
  Subscriber
  
  Hello everyone!
  I want to model a rubber ball and the air inside it. So far, I was able to model the hyper elastic material and its internal pressure as a constant pressure. But the problem here is that I want the air pressure inside the ball to increase during the force applied to the ball. When I use air material, it gives an error like below:
  
  "Air contains invalid property data. These problems are:
  Elasticity is required, but is currently undefined."
  
  Does anyone have a solution for this problem? In general, can such a problem be solved in the structural module of Ansys or I have to solve in FSI?
  
  I would be very grateful if you could guide me.🙏🌸
- January 6, 2023 at 10:25 pm
  
  HuiLiu
  Ansys Employee
  
  Hi the default Air properties won't work for your application. You can consider using the hydrostatic elements. See this link:
  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/ans_elem/Hlp_E_HSFLD242.html

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