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  • Users: RedFrame
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  1. RedFrame

    UMAT - Basic Elastic Properties help

    Hi, I am new to Abaqus and I am currently writing a basic UMAT subroutine .I started off with just Elastic Properties where the input is just Elastic Modulus and poisson ratio. However, the subroutine doesn't work and the error messages are as follow. Elastic.for(7) : Error: Unrecognized...
  2. RedFrame

    Modelling temperature as a stress field

    Hi corus, In your post are you using heat trasfer analysis or static general? This is because in the heat-trasfer analysis there is no temperature to set in the load module (only Surface heat flux , body heat flux and concentrated heat flux)? As for the interaction module, all of them are for...
  3. RedFrame

    Modelling temperature as a stress field

    Hi Corus, your idea really do make a lot of senses but forgive me as I do not understand how to do you "fix the temperatures to vary by some amplitude over the time interval"? Let's say its 100C to 23C with -2C/min cooling rate, what will the amplitude be and where can I set this in the step...
  4. RedFrame

    Modelling temperature as a stress field

    Hi corus, Sorry but how do i run a thermal analysis? I only have the Elastic modules , CTE , starting and final temperature. If i'm not wrong Heat transfer analysis will require me to specify the density, specific capacity and conductivity? Thanks!!
  5. RedFrame

    Modelling temperature as a stress field

    rstupplebeen many thanks for assisting me.. but abaqus still only consider point A to point B although its step 1 to step 2 instead of initial step to step 1. Are there any other ways to set the temperature instead of setting it in predefined field? This forum is superb:) I shall contribute bk...
  6. RedFrame

    Modelling temperature as a stress field

    To be honest I don't think its a bug because the main problem here is the Predefined field? I am not sure if you set the the predefined field of initial step at 100C and then set the predefined field as 23C in step 1, will this represents thermal cooling? If that is the case is there anyway to...
  7. RedFrame

    Modelling temperature as a stress field

    Many thanks for the replies!!! My problem here is because the elastic modulus and CTE is temperature dependent.. let's say its not linear.. but Abaqus only deals with temperature A and temperature B... meaning that anything between A and B is ignored.. This is verified when I entered all kinds...
  8. RedFrame

    Modelling temperature as a stress field

    Hi, I am new to Abaqus I would appreciate if the experts here could give me some simple advices. Basically I am trying to simulate the stress rate when the model is cooled from 100C to 23C.The cooling rate is 2C/min. Since the model is cooled uniformly , I do not need any heat transfer...
  9. RedFrame

    Is the real temperature slope necessary?

    Hi, I am trying to model a simple temperature stress analysis. If i suppose the temperature is constant in the volume, and changes uniformly , is it correct to forget the real temperature slope (like 2°C / minute), and simulate the thermal expansion as a static general of 1 time step...

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