Implementation of Thermoplastic Material in RADIOSS

Begoña
Begoña Altair Community Member
edited October 2020 in Community Q&A

I am trying to implement a thermoplastic material in RADIOSS to simulate a bird strike and I do not know which card material  would be the right one. Could anyone help me, please?. 

 

Thank you in advance.

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Answers

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited February 2019

    Hi Begoña

     

    You can use MAT law 74. This law describes the Thermal Hill orthotropic 3D material and is applicable only to solid elements. The yield stress may depend on strain rate, or on both strain rate and temperature.

    Check Radioss help for more details regarding the material.

     

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

     

    We also have tutorials on bird strike simulation, which is discussed on the Radioss e-book.

    Have a look at that too.

    https://altairuniversity.com/free-ebooks-2/free-ebook-crash-analysis-with-radioss-a-study-guide/

     

     

  • Begoña
    Begoña Altair Community Member
    edited February 2019

    Hi Pranav,

     

    Thank you for your previous answer. 

     

    This is the thermoplastic I want to implement and I need the card for 2D. So , I chose MAT law 73. Would be that correct?.

     

    I am not sure how to implement the material properties. Could you send me an example, please?. 

     

     

    Thank you very much. 

    <?xml version="1.0" encoding="UTF-8"?>Thermoplastic.PNG

    <?xml version="1.0" encoding="UTF-8"?>Thermoplastic_Card.PNG

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited February 2019

    Hi Begoña

     

    I do not see an input to enter the thermal exponent in MAT law 73. 

    According to the material data you provided, I think its more suitable to use Mat law 2.

     

    Mat Law 2 - This law represents an isotropic elastoplastic material using the Johnson-Cook material model. This model expresses material stress as a function of strain, strain rate, and temperature. A built-in failure criterion based on the maximum plastic strain is available

     

    You can input the youngs modulus, initial density, thermal exponent, yield stress, plastic strain etc (according to your data)  in Mat law 2

    Note: use IFLAG=1, if you do not know the Hardening parameter(b) and exponent(n).

     

     

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