Material Non-Linearity - MATS1 or MATX02 - OptiStruct

Neeraj Kumar
Neeraj Kumar Altair Community Member
edited April 2022 in Community Q&A

I am doing explicit dynamic analysis in OptiStruct and there is material non-linearity. Which card should I use to define material non-linearity: MATS1 or MATX02?

Thank You.

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Best Answer

  • PaulAltair
    PaulAltair
    Altair Employee
    edited April 2022 Answer ✓

    It depends if you are using 'native Optistruct Explicit' (NLEXPL subcase) or 'Radioss Integration Explicit' (EXPDYN subcase), MATS1 is used by the former, MATX02 by the latter

Answers

  • PaulAltair
    PaulAltair
    Altair Employee
    edited April 2022 Answer ✓

    It depends if you are using 'native Optistruct Explicit' (NLEXPL subcase) or 'Radioss Integration Explicit' (EXPDYN subcase), MATS1 is used by the former, MATX02 by the latter

  • Neeraj Kumar
    Neeraj Kumar Altair Community Member
    edited April 2022

    Paul Sharp, how do I specify the failure point (i.e. ultimate tensile strength and the corresponding failure strain) using MATS1 card.

  • PaulAltair
    PaulAltair
    Altair Employee
    edited April 2022
    Neeraj Kumar said:

    Paul Sharp, how do I specify the failure point (i.e. ultimate tensile strength and the corresponding failure strain) using MATS1 card.

    you can't really, save for setting the stress/strain curve close to flat at this point, native OS Explicit has no element erosion as yet so you can't 'fail' elements as such

  • Neeraj Kumar
    Neeraj Kumar Altair Community Member
    edited April 2022
    Paul Sharp_21301 said:

    you can't really, save for setting the stress/strain curve close to flat at this point, native OS Explicit has no element erosion as yet so you can't 'fail' elements as such

    Paul Sharp, 

    Suppose I specified the stress-strain curve upto "X" strain, then what will happen if the strain in the model is more than "X"?

    Will the solver do extrapolation?

  • PaulAltair
    PaulAltair
    Altair Employee
    edited April 2022
    Neeraj Kumar said:

    Paul Sharp, 

    Suppose I specified the stress-strain curve upto "X" strain, then what will happen if the strain in the model is more than "X"?

    Will the solver do extrapolation?

    I think so, but to be honest I have not tried!

    From the help:

    'If the deformations go past the values defined in the table, the curve is extrapolated linearly'

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