Titanium Coating on milling cutter

[Hanzo1987]

Hi,

I am simulating a milling Process in Abaqus. For the material I use Tungsten carbide with the properties:
Density: 14500 kg/m^3 (1,45e-8 t/mm^3)
Youngs Modulus: 580 000 MPa
Poissons Ratio: 0.22

I also want to coat my Tool with a Titanium Coating like this:
TiAlCN Properties

Hardness 3500 HV
Friction Coefficient against Steel: 0,2
Layer thickness 2-4 mü
I have the 2 following questions:

1. I tried using Skins, but are the material properties for my Coating enough to define it? Or do I need more properties like Youngs Modulus etc.?
2. Is the friction Coeeficient against Steel the on I use to define the cotact between the tool and the Workpiece? See this picture:

https://files.engineering.com/getfi...ffa9-4def-bd8e-9af3487044f8&file=Friciton.PNG

Thanks for your answers

 

[FEA way]

You have to assign a section (shell or membrane) to the skin so you will need Young’s modulus and Poisson’s ratio as well.

Yes, friction coefficient defined for contact is the one that you should specify for steel-titanium material pair. Just keep in mind that skins are not always considered in contact calculations, you may have to add them manually. Check the "Defining skin reinforcements" chapter of the documentation for more details.

 

[Hanzo1987]

Thank you. Is it possible to insert the Hardness in the Property module? I cant find the option for this.

 

[FEA way]

No, hardness is not used as input property in FEA programs. You can only calculate it by performing virtual hardness test.

 

[Hanzo1987]

I was able to get a Skin definition on the tool. Now the I have the PRoblem, that i get an Error, because I have a mistake with the constraint definition that I use. If I get rid of the SKin everything is fine. How can I use a skin AND a constraint definition without getting an error?

 

[FEA way]

What kind of constraint is that, where is it applied and what does the error say ?

 

[Hanzo1987]

It is a Rigid Bofy Defintion for the tool. I uses a Reference Point at the tip. The Error in the Satus File says:

All the nodes of deformable contact surface ASSEMBLY_M_SURF-20 are
shared by the rigid body with reference node 1 instance . In
Abaqus/Explicit nodes cannot belong to both a deformable contact
surface and a rigid body. The deformable contact surface should be
converted to a rigid surface by including the underlying elements of
the surface in the element set of the rigid body.

If I delete the Skin everything is fine.

 

[Hanzo1987]

Does anyone know a solution to this?

 

[FEA way]

If you want to make the tool rigid then don’t use skin feature and vice versa. One excludes the other.

 

[Hanzo1987]

But is there another possibility to create a coating that goes with rigid body? Will the calculation time be much higher when its not a rigid body?