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Salaya

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  1. Kunal Hirudkar liked a post in a topic by Salaya in Time Step Less or Equal Zero Error   
    Hi Everyone, 
     
    I am working with Radioss. I use TYPE 7 and TYPE 2 contact for this model (You can see from an image below). I set the Engine file as shown in image below.
    In the beginning, Radioss run normally. But later found a problem, Time Step Less or Equal Zero Error.
    (Previous model, I set nodal time step in engine file less than zero but Radioss run normally.)
    Can anyone take a look into my model what's wrong. what change, I have to make.
     
    Thank you in advance.
     


  2. Simon Križnik liked a post in a topic by Salaya in Time Step Less or Equal Zero Error   
    Ivan, Thank you for your response.
  3. Salaya liked a post in a topic by Simon Križnik in No Displacement and Less Stress Result after Simulation.   
    Hi,
     
    this is strange. Can you share the model file?
  4. Salaya liked a post in a topic by Simon Križnik in No Displacement and Less Stress Result after Simulation.   
    You can send it to my email
  5. Salaya liked a post in a topic by Pooja S in No Displacement and Less Stress Result after Simulation.   
    Hi Salaya
    Type 2 interface is used to represent the  tie contact, refer the attached document  to know more about the type 2 contact 
    INTER_TYPE2.pdf
  6. Salaya liked a post in a topic by Simon Križnik in No Displacement and Less Stress Result after Simulation.   
    @Salaya
     
    it is likely the dsearch parameter is too small so some slave nodes do not find their master surfaces. If 0 is entered, the search distance by default is computed from the average size of the master segment.
     
    The following videos might help:

    7.2_Type2 _Tied Interface - Altair

    Learn HyperMesh RADIOSS Interface 2 Connections Spot Bolt RBODY Tied - Altair University
     
    Please go through free ebook Introduction to Explicit Analysis using RADIOSS – A Study Guide - the chapter on tied contact is attached.
    tied.pdf
  7. Salaya liked a post in a topic by Simon Križnik in Time Step Less or Equal Zero Error   
    I have already given generic advice. I will need access to the model for debugging. If you do not want to share it publicly you can send it to my email.
  8. Salaya liked a post in a topic by Simon Križnik in Time Step Less or Equal Zero Error   
    Hi,
     
    From the engine out file we can  review what is causing very low time step.
    It can be an element, a node or an interface.
    •For an element, check the related material (especially its Young modulus and density in case of an elastic-plastic material; and its viscosity in case of a visco-elastic material). There must not be an error in the units system that this data is given in. 
    Check the size of the element, since elemental length is proportional to time step. If some elements are distorting badly during simulation it will lead to very low time step and the run will terminate. In this case use small strain formulation (in the property card).
    •For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified.
    •For an interface, the gap of the interface must be verified if some failure happens on the master or the slave side of the interface. Check the interfaces defined in the model for any penetrations.
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