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General Mechanical

General Mechanical

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  3. Material properties of Silicone rubber

Material properties of Silicone rubber

    • April 11, 2020 at 9:39 pm
      Amin1372
      Subscriber

      Hi,


      I am using silicon rubber as a main material in my simulation but when I define this material by entering its properties ( Young's modulus, Poisson's ratio and density), I get wrong results. But when I use Silicon rubber from the Engineering data of the Ansys,workbench everything goes well. There problem is that there is no data shown in its data library to see what is the Young's modulus or other data of that.


      Can anyone help me out to find the material properties of the Silicon rubber in the Ansys?


      Thanks,


      Amin


       

    • April 12, 2020 at 12:13 am
      peteroznewman
      Subscriber

      Hi Amin,


      Please spell silicone rubber with an "e" on  the end.


      The silicone rubber in the Engineering Data is under the Granta samples.


      There is no Young's Modulus because it is a nonlinear material.


      It uses a Mooney-Rivlen 2 parameter hyperelastic material model.


      You can estimate the Young's modulus for low values of strain from the initial slope of the Stress-Strain curve. E = 1.8 MPa.


      • November 14, 2023 at 8:36 am
        anuroop padmakumar
        Subscriber

        after putting mooney rivilin it is showing like this

    • April 12, 2020 at 12:05 pm
      Amin1372
      Subscriber

      Hi Peter,


      So it's a very flexible material. But I can't understand the reason of differences in  the results of the Silicone rubber using Ansys engineering data and what I defined with E=1.9 GPa  and Density= 1250 kg/m*3 and Poisson  ratio= 0.495.


      For the higher Young's modulus (1.9GPa), reults are not symmetric while in the flexible one (1.8Mpa) are fully symmetric:


       



       


       


    • April 12, 2020 at 5:04 pm
      peteroznewman
      Subscriber

      Please show the geometry with the tooth numbers labeled.


      Is the mesh identical for these two graphs?  Show the mesh.

    • April 12, 2020 at 10:17 pm
      Amin1372
      Subscriber

      Yes, mesh in both models are the same. The plots in the previous post that I uploaded came from the Static loading. Do you think that differences might be due to poisson's ratio? because with E=1.9 GPa, Poisson's ratio goes to incompressible range (0.5) but I changed it to 0.495 to avoid that.


       



       


    • April 13, 2020 at 8:18 pm
      peteroznewman
      Subscriber

      Which analysis is this Reaction Force calculated by?


      Static Structural or Harmonic Response?

    • April 13, 2020 at 8:20 pm
      Amin1372
      Subscriber

      Static Structural. after this, I need to go through transient structural so before that I want to make sure about material.


       

    • April 14, 2020 at 8:56 pm
      Amin1372
      Subscriber

      Hi Peter,


      Do you know why these materials generate different results?


      Thanks,


      Amin 

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