How to simulate 1D stress wave propagation?

aman7aman7 Member Posts: 4

Dear All, I am trying to simulate Split-Hopkinson Pressure bar (SHPB). I have designed the incident, transmission bar of Al6061-T6, and sample. I am running simulation using Ansys Explicit Dynamics. In results i am getting SOUNDSPEED for Al 6061 : 6108 m/s. which is due to redial or Poisson's ratio (check another discussion: https://forum.ansys.com/discussion/comment/107401#Comment_107401) . But actual experiment neglects the radial effects considering only 1-D wave propagation.

Now, How can I simulate SHPB setup using only 1-D propagation of stress wave? What type of constraints i need to apply?

Comments

  • ekostsonekostson Ansys Employee Posts: 156
    edited February 23

    The sound speed is the speed used by the solver in the Courant condition which calculates the stable time step.

    So it is used in dt=typical_Element_Length/SOUNDSPEED by the software to calculate dt.

    We should not use this SOUNDPSEED to compare against theory or results-


    We should do as Peter and I explained in the previous post - so to get the speed of the stress wave, we need to see how long it takes for the wave to travel a certain distance in our FE results, just like you tried doing in the previous post where you showed stress time histories of the wave.

    https://forum.ansys.com/discussion/24696/how-to-find-stress-wave-velocity-in-al6061-t6-solid-bar#latest

    Thank you

    Erik

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