Failure models

Karthic_22061
Karthic_22061 Altair Community Member
edited October 2020 in Community Q&A

Hi All,

Is there any failure models available in Optistruct  for implicit  nonlinear analysis?

I need to remove the elements once uts is reached / strain value reached ?

 

Thank you

N.K

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Hi @Karthic

     

    Are you looking for a particular type of material?

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Hi @Prakash Pagadala,

    I am looking for plastic material, for now I am using the MAT1 with MATS1 (table data).

    I am facing the non convergence error due to heavy element distortion. So I would like to remove the elements failed in the model.

     

    Thankyou

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Hi @Karthic

     

    Have you gone through MATF card?

     

    In MATF you can use DUCTILE failure with a limit on stress. 

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Thank you @Prakash Pagadala,

    What should I select for criteria field in the MATF card?

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  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    @Karthic

     

    If you are using an isotropic material, you can use either STRN or DUCTILE

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Hi @Prakash Pagadala,

    If I am using STRN, should I specify the Material stress limits Vi  and Parameters for failure envelope.

    where to mention the Strain limit ? :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

     

    Thankyou

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Hi @Karthic

     

    I checked with experts and there is no element deletion will happen for now with MATF

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Hi @Prakash Pagadala,

    Thank you for the efforts.

    So for now element deletion due to material failure is not possible with Optistruct ?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2018

    Yes, you may have to use RADIOSS,

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited July 2018

    Thank you Prakash. Let me try in Radioss

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