# Explicit dynamic modeling of machining process coupled with thermal

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Subhash N posted this 06 September 2018

My problem is to develop a simulation model and determine the temperature distribution in the cutting zone. I'm doing this in explicit dynamic. Can anyone help me in finding the best way to find temperature distribution and cutting force during machining or how to add user defined output.

SandeepMedikonda posted this 07 September 2018

Subhash, I did a simple illustration for a test model of Aluminium block as shown a while back.

So, the crucial part is that you would need to have element erosion criteria defined.

Regards,

Sandeep

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Subhash N posted this 07 September 2018

Another doubt was in case of explicit dynamics there are no direct option to find temperature generation in the cutting zone and also to find cutting forces so can you please help me out with this.

And also can u share the type of contact you have used in that model.

SandeepMedikonda posted this 07 September 2018

Subhash,

You would have to insert temperature through the worksheet:

and for the contact forces, you should make sure that this is turned on in Analysis settings:

I used simple frictionless body interaction, which had self-contact turned on:

P.S: If a post answers your original question, please mark it as a solution (‘As Solution') so that it might help someone in the future. This will help reduce repetitive questions and help provide better support on this Forum.

Regards,
Sandeep

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Subhash N posted this 07 September 2018

Thank you so much sir I got it.

How to solve the same problem using Arbitrary Lagrangian-Eulerian formulation. Is there any way to specify this formulation.

SandeepMedikonda posted this 07 September 2018

Subhash,

First, you would need to add the material(Say 'Water' for example) as needed in the Engineering Data. Next, in the details of the geometry assignment for the body, you need to specify the Eulerian reference:

Then you would have to make changes to the Analysis settings as needed:

Regards,

Sandeep

Subhash N posted this 07 September 2018

Sir, I tried this one but this will become eulerian formulation right?

SandeepMedikonda posted this 07 September 2018

Subhash,

You are only specifying the Eulerian formulation for the bodies of interest (that would deform significantly) and by changing the scope to Eulerian Bodies alone in the Analysis setting, you are separating this from the Lagrangian aspect. So for the Other/Remaining bodies, the Reference Frame will still be Lagrangian.

Regards,

Sandeep

Subhash N posted this 08 September 2018

Ok sir thank you.

What kind of meshing will best suit these kind of problems.

Sir can I know the boundary conditions you have used.

SandeepMedikonda posted this 08 September 2018

I would recommend using linear Hex elements when every possible in Explicit problems.

The boundary conditions are shown in the first picture of the first post of this thread.

Subhash N posted this 08 September 2018

Ok sir. I'm getting an error like energy error too large . What might be the cause of it How can I solve it.

dinler posted this 22 May 2019

Dear Sirs,

For brittle workpiece material like grey cast iron, is there any way to model the chip formation without setting geometric strain limit on?

By the way what exactly geometric strain limit controls, equivalent elastric strain?

I would like to model chip formation when the workpiece material reaches maximum shear stress or I want to set a limit to plastic strain, I dont expect any plastic strain at all.

40933889146909@1458296381790/Stress-strain-diagram-for-a-brittle-material.png" alt="3. Stress strain diagram for a brittle material.  ">

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