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      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

George P Johnson

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  1. Modify X axis with Node ID

    Hi, I'm attaching a document which shows creating a cross plot values along a specified node path. I think this may help you, please go through the same. Cross plot values along a specified node path.pdf
  2. NODE ID

    Hi Zhaoying, You can review the node group in HyperCrash but I don't think it's possible to see the node ids of the node group in HyperCrash. I suggest you to export the model from HyperCrash, manually open the model file (_0000.rad) in Textpad and review the node group where you can see all the node ids.
  3. Error

    Hi Kamalakarrao, The out files clearly shows many penetrations in your interfaces. Please depenetrate them and also clear any intersections if any are present. Please go through the below post which shows the tool for checking and clearing penetrations in the model:
  4. Leaf Spring Nonlinear Analysis using Radioss solver

    Hi Pratik, It is not possible to minimize the run time for this model. I have also ran for a long time for those results. You can solve this with implicit solver, and please use OptiStruct, where you can use NLSTAT with LGDISP to solve the same.
  5. Pressing force for fitment analysis

    Hi Ganesh, The animation looks fine. Create an output block for the rigid body, so to see the force you can plot the force on this RBODY in a particular direction using T01 file in HyperGraph.
  6. Element distortion @ contact interface

    Hi Karthic, |FNX| is the absolute value of normal force of the X-component of the contact force. It is the X-component of normal contact force applied to the master segment due to slave node. Please go through the Help menu on /TH/INTER where this is shown. Normally we check for the normal forces and resultant force.
  7. Hi Abhinav, Let me know the unis consistency you have followed in your model. Also share a pic of your stress- strain curve.
  8. Element distortion @ contact interface

    Hi Karthic, The above approach seems correct. Create an output block for contact and from the T01 file you can plot the normal resultant force for the contact (NF). Also you can generate animation files containing vectorial data for contact force using /ANIM/VECT/CONT
  9. SPH Inlets/Outlets Conditions

    Hi Sara, I checked the same file in HyperCrash but it shows only 2 components and it runs fine without any errors in RADIOSS. The same file is attached for your reference. test7_0000.rad
  10. Pressing force for fitment analysis

    Hi Ganesh, There are two options for interference fit. First you can simulate the physical press fit process in RADIOSS. Define contact between the two parts, constrain one part and apply an imposed displacement on the other part and simulation the physical press fit process. Second option is to use /INTER/TYPE24 contact and set INACTI=-1 which will apply forces to remove initial intersection caused by the press fit. The one limitation with INACTI=-1 is that it applies the force all at once and for large initial penetrations the force can be too large. To reduce the force you can use the STFAC option on /INTER/TYPE24. In the attached model, STFAC=0.25 seems to give reasonable results. Run the model with STFAC=1 (default) see the difference. I ran the attached model in RADIOSS version 2017.1 but 14.0.230 or 2017.0 should also be fine. Please review the attached. Interference_Fit_rad_s2_0000.rad Interference_Fit_rad_s2_0001.rad
  11. Hi Ganesh, We cannot perform heat treatment process simulation in RADIOSS.
  12. Leaf Spring Nonlinear Analysis using Radioss solver

    Hi Pratik, As I told in the last reply this is typically not an explicit case. In order to achieve a similar kind of simulation which you have shared we need to run the simulation for more time and that results in this high run time.And moreover the timestep is also less in your model. The only possibility is to try with OptiStruct, where you can use NLSTAT with LGDISP..
  13. Leaf Spring Nonlinear Analysis using Radioss solver

    Hi, As the time step drops the run time will increase. From the engine out files check what is causing this issue. It could be an element, or node or interface. For an element, check the related material.There must not be an error in the units system that this data is given in. check the element size also. 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. Also check the interface for any penetrations. You can try imposing a time step for the model (/DT/NODA/CST). Please refer tthis video for timestep in RADIOSS Explicit: https://altair-2.wistia.com/medias/o0bfml9ah5 As a guideline, in order to achieve this behavior I had to provide a large run time in RADIOSS. Normally for explicit analysis we run it for milliseconds only but your case goes to seconds. And so the total run time will be very high. I strongly recommend you to try the same in OptiStruct, NLSTAT with LGDISP. We have tutorials on this in Help Menu.
  14. Leaf Spring Nonlinear Analysis using Radioss solver

    Hi, Please share the out files (_0000.out and _0001.out) and also the engine file.
  15. Element distortion @ contact interface

    Hi Karthic, Penetrations result if a slave node is closer to the master segment than the calculated gap. Since the interface stiffness is nonlinear, the slave node cannot cross the master segment. If there is large penetration, the interface stiffness becomes large, leading to reduced time step. Specify minimum thickness of the model to avoid numerical issues for Gapmin.