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AISI1020 UMAT

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  • AISI1020 UMAT

    I want to write a constitutive law of an AISI material,
    I found all necessary Data in Bibliography; the constitutive law is as follows:

    ********* n***** m
    S=S0.(E/E0).(ER/ER0).F(T*)
    ////////////////////////////////////////////////
    Where
    S=Stress
    E=Strain
    ER=Strain rate
    S0, E0, ER0 are given reference values
    m,n given coefficients (Exposants)
    TEMP=Temperature
    And
    T*=TEMP/Melting TEMP
    This is defined as:


    F(T*)= -1,23.T*+1,27 for TEMP<=600C

    /////////////////3
    F(T*)=72,3.T* -137,5.T* +80,4.T*-13,9 for 600<TEMP<=900C


    Some properties are temperature dependant,



    1. Thermal conductivity: Kp=53,56-0,00266.T W/m/C


    2. Specific Heat: Cp=398,8+0,8273.T-0,00055.T J/Kg/C
    3. Thermal expansion coefficient: 1,6E-5 m/mC
    4. Young's modulus 75 GPa
    5. Poisson's Ratio 0,3
    6. Density: 7882 kg/m3
    /////////////////////////////////////////////////////////////////

    My main objective is to write a subroutine that considers all above data, Can any one help me to do this?and what are the necessary options. I am using the ABAQUS/Standard 6.3 version. If any one has a similar subroutine, please send it. With lot of thanks

  • #2
    Although AISI 1020 is a carbon steel and not polymer :o
    your question is still interesting.

    As you probably have noticed, there are very few public UMATs available. I recommend that you carefully study the ABAQUS manuals, they have an exemplar UMAT for a J2-plasticity model.

    Also, for your information, the ABAQUS manuals state that writing a UMAT takes considerable experties, and I agree with this. If you have a good background in solid mechanics and computer programming, then you should be able to write the UMAT that you are describing.

    Best of luck,
    Jorgen
    Jorgen Bergstrom, Ph.D. PolymerFEM Administrator

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