LS Dyna

LS Dyna

Pressure on line body in explicit dynamics

    • arunprabhat12
      Subscriber

       I have to apply pressure on truss line body members. Pressure is time varying blast triangular load. When i am applying line pressure through tabular instead of magnitude there is some error. But when using line pressure using magnitude then there is no error. So how can i apply a time varying pressure on line body?

    • Sandeep Medikonda
      Ansys Employee

      Hi Arun,


        Please see this post on how to define an expression for pressure based on time.


      Regards,
      Sandeep

    • arunprabhat12
      Subscriber

      Thanks Sir


      But when i am applying line pressure through tabular data, an error "Could not transfer loads and constraints to the solver" occurs.


      But for pressure on surface body it is not showing any error

    • Sandeep Medikonda
      Ansys Employee

      Arun, Can you explain with inline pictures as to what you are doing?

    • arunprabhat12
      Subscriber

      this is a normal cantilever beam with any random c/sec.


      I am applying a time varying line pressure in explicit dynamics module.





      In the solution, this error appears


    • arunprabhat12
      Subscriber

      But in the static structural module this type error is not shown in applying line pressure 

    • Sandeep Medikonda
      Ansys Employee

      Arun,


      Looks like only the constant load is not supported for Explicit Dynamics. This is from the manual:



      Loading Data Definition : Enter loading data using one of the following options.


      Constant: Supported.


      This is the only option supported for Explicit Dynamics.



      Regards,
      Sandeep
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    • arunprabhat12
      Subscriber
      Thanks Sir I have checked the manual and it is written that tabular data is not supported for acceleration and line pressure in Explicit Dynamics.
    • arunprabhat12
      Subscriber
      If I do the analysis of bridge under blast in Autodyn solver instead of work bench, will that be much helpful?
    • Sandeep Medikonda
      Ansys Employee

      Hi arun,


      Yes, tabular data is supported for displacement, velocity, force, pressure BC. But not for acceleration, even in Autodyn GUI.


      Regards,
      Sandeep

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