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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
    • Rahul Ponginan

      Introduction to Explicit Analysis using RADIOSS.   11/02/17

      We are excited to announce the release of updated RADIOSS ebook, Introduction to Explicit Analysis using RADIOSS. We have added new tutorials, more FAQ's....etc with more topics covered. This study guide aims to provide a good introduction into the exciting and challenging world of explicit Finite Element Analysis.
      You can download the updated RADIOSS ebook here: Introduction to Explicit Analysis using RADIOSS                                                           
RJ Hammada


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Hello all,


I am a new user of Radioss and I need your help.


I am modelling two doors with a lock with a Johnson Cook failure model, on which I am applying a time dependant pressure.


However, I have the following error, multipule times: "TIME STEP LESS OR EQUAL DTMIN FOR SOLID ELEMENT"


I am already using Ismstr =2 in my P14 solid property and I have a type 2 interface, so the lock keeps a tied contact with the others doors. And I want the failure of the lock.


I do not know how to solve this issue. Is there any options/ method to remove this error?


Thank you very much for your help.

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Hi Hammada,

The solid elements in your model is getting badly deformed that the time step has dropped very badly and this has terminated the run.

Check the material parameters and ensure proper material type is selected and the inputs are correct.

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Hi George P Johnson,


Thank you very much for your quick answer.


Indeed, my lock is getting deformed but it is intended. I am looking for its failure. Here are my material parameters: (I am working with the IS units)




I also added a failure model:




I don't see any probelms.


Thank you for your time.


Kind regards,

RJ Hammada.

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