Interpolation - Stress Strain Curves

Altair Forum User
Altair Forum User
Altair Employee
edited October 2021 in Community Q&A

Hi,

I am trying to do a Simulation for a Plastic intake manifold subjected to different temperatures for Analysis. I have the stress strain values at 120°C and 150°C respectively  from the material    supplier. However I am interested in calculating at 130°C. Does anyone know how to key in so that the optistruct  can interpolate at 130°C. Thanks in advance for your replies.

Tagged:

Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Do you want to carry thermal stress analysis?

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2020

    Please find attached .fem deck using Optistruct solver.Tables1 & Tablest for temperature dependent  stress strain curves.

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Thanks for the attachment Rahul. I tried the same considering your model, however I came across following error no. 3012. I have attached the screenshot below. Awaiting for your reply?

    <?xml version="1.0" encoding="UTF-8"?>screenshot.png

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Looks like error is because of Tables1 enteries.How many enteries you have in Tables1 card?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Thanks for the reply. I have 12 entries in each tables. I have attached the screenshot below. Everything is in the ascending order but couldn't figure out the error.

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Could you share us out file & if possible share .fem file aswell.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Hi. I have shared the .out files .

     

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Could share screenshot of Tables1 enteries?

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Also you have defined total strain or plastic strain?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    I have defined plastic strain

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Screenshot of tables1 entries

    <?xml version="1.0" encoding="UTF-8"?>2016-06-28 09_33_57-TABLES1_NUM =.png

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Remove 0 in X & Y enteries and run.

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    I mean start curve from .0025 & 7.25.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    I did but comes the error doesnt satisfy Zero non Zero requirement. I changed the typstrain to off so as to avoid conflict but doesn't work either.

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Did you refer the deck which i have shared?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    Of course I did but seems there is some other Problem which leads to error. I have one question from your fem model, the value of Limit1 as 100 because I don´t see the Initial yield Point as 100 in the tables which you have used. Thanks.

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    OS considers only those value given in the TABLEM1, TABLES1 and TABLEST values.Please share us the error you are currently getting.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited June 2016

    I used MATT1 for temperature dependent material and the Simulation did run this time without any Errors. Thanks for your promt replies.

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited June 2016

    Thanks for the update.

  • Diogo Torrão
    Diogo Torrão Altair Community Member
    edited October 2021

    "I have the stress strain values at 120°C and 150°C respectively  from the material    supplier. However I am interested in calculating at 130°C. Does anyone know how to key in so that the optistruct  can interpolate at 130°C."

    Thats also a question that I have on my head. I have multiple material curves for different temperatures but, as obviously, temperature varies across the part I am studying. How the solver chooses the correct curve to apply if there are temperatures between the temperatures used to define the curves ?

    Maybe you can explain that.

    Thanks in advance.

Categories