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LS Dyna

Regarding Drilling operation in ansys explicit dynamic ( Validation of research paper)

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    • MAMIN219
      Subscriber

      Hello sir I am attaching one research paper along with my ansys 19.2 drilling operation file. Problem : after simulating results my answer can't match with that thesis. How can I validate that research paper for better understand of drilling operation in ansys explicit dynamic

    • peteroznewman
      Subscriber
      Validation occurs when you compare your simulation result to an experimental measurement.nYou are not doing validation. The research paper did no validation.nYour model is wrong because you used a Fixed Support on all six faces of the work piece. You should only fix the four edge faces.nYour model is wrong because you have zero friction in the Body Interaction. You need a non-zero friction to create heat.nYour model is wrong because you used a Remote Displacement on all seven faces of the tool. You should only use the top flat circular face.nYour model did not change the Erosion Controls from Strain to Material Failure. If you do those things, this is what you will get...nI don't think the research paper produced a result that would match any experimental data. The mesh is too coarse and they only used 2 elements through the thickness of the work piece.n
    • MAMIN219
      Subscriber
      Respected sir, Thank you for your kind reply. According to your guidance I have tried simulation once again but There is huge difference in value Or Equivalent Stress ( von-mises) I am getting close answer for only total deformation. Can you please guide us for other parameter so that we can get very close in our answer according that paper.Also can you please tell me Erosion Controls from Strain to Material Failure in brief for better understand. nAnd also How can I find temperature profile for tool and workpiecenn
    • peteroznewman
      Subscriber
      My advice is to not spend time trying to get your model results to match the results from that paper, which did not do a mesh refinement study. I don't find any scientific value in that paper. I recommend you find a research paper with a simulation result validated against actual experimental measurements including statistics on the variation about the mean.nThe default Erosion control in Explicit Dynamics is the element fails when the strain reaches 150%, which is an arbitrary value used for any material. That is not at all relevant. You have a material model that has a failure criterion built-in that has been validated against experimental measurements. That is much more relevant.n
    • MAMIN219
      Subscriber
      What about user defined Function in explicit dynamic. Like if I am trying to perform this whole drilling operation and after simulation I am Adding UDF with TemperatureAll command. Is this correct way to find out temperature profile for this operation Or are there any other approach for finding suitable temperature for drilling and other operation. nThank youn Mihir Aminn
    • peteroznewman
      Subscriber
      It is called a User Defined Result and you type the name TEMPERATUREALL as you said.n
    • MAMIN219
      Subscriber
      respected sir, I have applied all things with your guidance. I have doubt in analytical end time calculation for drilling operation .Can you please tell explicate ndynamics end time calculations for 285 RPM Spindle sped .nI am also attaching my ANSYS file in which time step error is there because I have doubt in end time calculations. nAlso how can I find thrust force in this drilling operation.nn
    • Miner
      Subscriber
      I am working on the cutting simulation. My experience is before the parametric study, we should do mesh sensitivity analysis first. When the mesh siez effect is ruled out, the subsequent parametric study could be reliable.n
    • MAMIN219
      Subscriber
      respected sir, Please give your valuable feedback on my file and please tell how can I find end time for drilling process.nnwith regards,nMihir Aminn
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