MAT LAW 70

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

Hello,

 

In MAT LAW 70, I want to confirm, If I give loading curve, do I still need to define maximum young's modulus and maximum strain?

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Answers

  • Simon Križnik
    Simon Križnik Altair Community Member
    edited March 2020

    Hi,

     

    Emax and EPS_max are not mandatory, if the loading curve is defined.

     

    From Radioss help:

     

     

    When εmaxεmax is reached, Emax is used whatever the curve definition is.

    E0 and Emax used to calculate the current time step. According to current value of strain, Radioss interpolates Young's modulus between E0 and Emax linearly, where E0 is also used to calculate contact stiffness. Radioss automatically modifies E0 if it is less than the initial value according to the input stress/strain curves tangents.
    • If E0 is not specified, use maximal initial slope of all stress strain loading curves as E0.
    • If Emax is not specified (or set default), use Emax as E0. Specified value of Emax should be greater than E0, otherwise also take = E0 as Emax.
    • If εmaxεmax is not specified (or set default), take the strain where, Emax is reached for the first time on one of the loading curves.
    • If both εmaxεmax and Emax are specified, take εmaxεmax where, Emax is reached for the first time on one of the loading curves.

     

     

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