Material creation for Explicit Dynamics Analysis in Simlab

Sivaprakash_V
Sivaprakash_V Altair Community Member
edited February 26 in Community Q&A

Hi Good day !

I want to perform a Contact stress Analysis for gears in simlab.

I am using two different materials for driving and driven gears.

I have a material properties for the above two gears ( E, Nu. RHO, Yield & Ultimate )
Now I have some doubts in Material creation.

image.png

I assumed the Name, Material ID ,category, class and model as default. Then in the Plastic tab, I click the table icon in the side of yield stress strain table. A table dialogue box was opened. In that box, which one option should I use like Temp. stress plastic strain, stress- total strain, stress - plastic strain etc..
In which basis should Select those options.
Kindly suggest me that.

By using the above mentioned material properties, can we plot the stress vs strain plot manually?
If Yes, Kindly let me know How to plot it?

Thanks & regards,
Sivaprakash V.

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Answers

  • Marina_Lima
    Marina_Lima
    Altair Employee

    Hi Sivaprakash,

    If you only have the properties you mentioned (E, Nu. RHO, Yield & Ultimate), you don't need to fill in the "Plastic" portion of mechanical properties. However, if you want to use non-linear data from a stress-strain curve, then you should use this field. In the specific tables, use only what you want to consider for your application. For example, if you have the complete stress-strain curve, with both the elastic and plastic parts, use the "Stress-TotalStrain" table. If you only have the plastic part, use "StressPlasticStrain". If temperature is applied in the model, then you should use the curves with this variable, and so on.

    After creating the curve, just double-click on the table created in the Property Browser, and the curve will be displayed.

    image.png

    I noticed that you are creating the material with an OptiStruct profile. I just wanted to alert you that if you intend to run the simulation in Radioss, you should define your solution before creating the material, as the material configuration is slightly different in the Radioss profile.

    Best regards,
    Marina Lima

  • Sivaprakash_V
    Sivaprakash_V Altair Community Member

    Hello Marina,

    Thanks for your reply.

    Yes, My intend is to perform this analysis using Radioss and I created the solution before material creation.

    In Drop Impact solution, Is the simulation runs with out the non linear material property?

    Because I am trying to create a materials using Radioss Solver interface in simlab and solution type as Drop impact.

    In new material creation table there is no option for entering the yield stress, ultimate stress etc.

    image.png

    If I click the yield stress strain table, a table will open for entering values.

    But with these (E, Nu. RHO, Yield & Ultimate), where can I enter these values in radioss material creation in Simlab?

    Thanks & regards,
    Sivaprakash v.

  • Marina_Lima
    Marina_Lima
    Altair Employee
    Answer ✓
    https://community.altair.com/discussion/comment/190581#Comment_190581

    Hi Sivaprakash,
    With those properties you mentioned, it is better to use Johnson-Cook Simplified material model.

    image.png

    Best regards,
    Marina Lima

  • Sivaprakash_V
    Sivaprakash_V Altair Community Member

    Hi Marina,

    Sure, I will use the Johnson -cook Simplified Material Model .

    Thanks & regards,
    Sivaprakash V.

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