unexpected results when changing the material from structural steel to glass

- August 24, 2023 at 10:05 am
  
  subhav goel
  Subscriber
  
  Hi everyone, I am performing a static structural analysis in ANSYS 19.2. between a cylinder and a plate in contact. When using structural steel I am able to get a gap in the contact area, which is as expected with a frictionless contact. But as soon as I changed the material to Quartz glass, there was no gap between the contact surfaces for the same boundary conditions. I am unable to understand why this is happening.
- August 24, 2023 at 10:57 am
  
  Sampat Kumar
  Ansys Employee
  
  Hi Subhav,
  Have you changed the material in the same model or are you running two different models? Is this happening with the Quartz glass only or with other materials also? Please let me know.
  
  Regards,
  Sampat
  - August 24, 2023 at 12:35 pm
    
    subhav goel
    Subscriber
    
    Hi Sampat, I changed it in the same model. I have checked it only with cast iron or as a cast iron cylinder and aluminum plate. for both of these models, I was able to get a gap, but there was no gap when I had a Quartz glass cylinder
    Regards
    Subhav
- August 24, 2023 at 11:34 am
  
  subhav goel
  Subscriber
- August 25, 2023 at 2:10 pm
  
  Sampat Kumar
  Ansys Employee
  
  Hi Subhav,
  Will you please upload the screenshot of the model and contact status of both simulations? Also, upload the screenshot of the contact's settings.
  
  Regards,
  Sampat
  - August 25, 2023 at 5:22 pm
    
    subhav goel
    Subscriber
    
    Hi Sampat
    please find the screenshots attached below. Unfortunately I can’t upload the screenshot of the whole model as its a ongoing project with but please find the half model for your consideration.
    Regards
    Subhav
    - September 5, 2023 at 9:45 am
      
      subhav goel
      Subscriber
      
      Hi Sampat could you think of any reason for these results
    - September 6, 2023 at 3:29 pm
      
      Sampat Kumar
      Ansys Employee
      
      Hi Subhav,
      I apologize for the delayed response.
      I can see you have attached the result of the contact tool under the solution. Please verify, if you selected the proper contact and target side in the contact tool while evaluating the result. I have created the dummy model and checked with the same version but did not find any differences.
      
      Although your value is also small. Is this value-creating any issue in your result? what is the penetration and geometric gap value in the contact tool status under the connection?
      
      Regards,
      Sampat

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