Learning Forum

[godaramohit10]

I am getting time step error again and again, also my simulation time is too high. I would like to request you to help in my project.

Screenshot (140).png

[agopalkr]

It would help if you provided more detail on your simulation. For example is the drill piece a rigid body while the block is flexible/rigid? (since I am assuming the deformation will happen on the block). By making the drill piece rigid you might be able to reduce the time.
The simulation time is related to your time step. The link below provides a complete training on it.
The time step is directly proportional to the characteristic length of the smallest element. I would assume this would be the smallest hex element in your block. You can check it out by changing the mesh display to characteristic length and it will highlight the element in question and the length.
Also are you using Body interactions? ANSYS explicit prefers Body interactions (bonded, reinforcement, friction, contact) over the regular connections.

[Ram Gopisetti]

hi @godaramohit10, in order to get proper support from the ANSYS employes, i would recommend to post your images inline to the text. Try with SPH and see if you could able to solve the problem!!, FEA with Lagrange is not suitable to this very case and do check your materials, it is amust to include EOS+damage+Plasticity (johnson cook , etc should be your worthy candidate).
Cheers, Ram

[godaramohit10]

Dear and,I am attaching my project, I have added everything which a simulation requires, but still time step error occurred. Also my simulation end time is about 16 sec, which you know is very high. How can I reduce the simulation time as it is showing, it will take many days to complete. Please suggest me some tips to reduce my simulation time.

[Ram Gopisetti]

ANSYS employes are not allowed to open the attached files. Well yes, these simulations take time, but given proper computation boost like distributed over large number of cores , perhaps you can reduce the end time to scale the experiment.and Check the following threads for some clues( possibly an worked out example by peter).
i would also encourage your to do some initial research (literature review) on procedures and methods before you start the FEA.
Cheers, Ram

[godaramohit10]

I have computed total number of steps but what I will put in Initial time step, maximum time step and minimum time step ? As I have got total number of steps according to that formula are 6.07e7. Please clarify this doubt.
Another doubt , Is there any way other than remote displacement to provide cutting velocity in explicit dynamics? For this model I first converted my rotational speed into degrees. How we can enter feed rate values.
Thanks in advance, please help me.