Regarding Sliding Wear simulation in Abaqus for a PTFE Seal.

[Billal]

I am PG student in India. Now i am doing my final year project in Wear Simulation of PTFE Seal assembly in the Reciprocating Piston. Sealing units consists of different types of polymer materials like PEEK, Viton-B, PTFE with different fillers.

I want the procedure, how to do the wear simulation using abaqus (using transport analysis).Because piston will reciprocate inside the cylinder for certain number of cycles. Due to this wear will occur in the sealing unit. (Reciprocating motion can use in transport analysis?)

Also i need the material curve (stress-strain curve) for the following materials for analysis.

1. PTFE (60% ) + Bronze(30%) + Carbon(4.5%) + Graphite (2%) + MoS2(2%)+ Glass fiber(<1%) + Asbestos (<1%)

2. VITON-B.

Can you please help me?


With Regards,
K.Mohammed Billal.

[Jorgen]

That indeed sounds like a challenging project. As you likely know, it is not easy to explicitly simulate wear using a finite element method. The reason for this is that wear is a microscopic phenomenon, and the FE method works best for one single length scale.

With an appropriate damage/failure condition, however, you can certainly attempt to create an FE model of the piston in your project.

I recommend that you perform actual testing of the materials that you are interested in. If you cannot do that, then perhaps the raw material supplied can provide information.

Best of luck,
Jorgen

[Billal]

Thank you Jorgen.
Wear testing also i am trying to do. But it is very diffcult to get the reciprocating wear testing equipment. So, now i am mainly concentrate on the FEA simulation for the wear. Or i can calculate the wear using the contact pressure in the Archard's Wear law.
So i need the material curve (stress-strain curve) for the following materials for analysis. Or aleast if there is any equivalent material curve available for those materials, can you please provide me.

1. PTFE (60% ) + Bronze(30%) + Carbon(4.5%) + Graphite (2%) + MoS2(2%)+ Glass fiber(<1%) + Asbestos (<1%)

2. VITON-B.

Regards,
Billal.

[Jorgen]

I don't have experimental data for the exact materials that you are looking for, but I have data for somewhat similar PTFE and Viton.
You can find my experimental data on the following page (http://www.polymerfem.com/modules.php?name=Materials_Models).

- Jorgen

[Billal]

Thank you Jorgen.

I downloaded the test data from your site. Can you give me the constants for the best fit curves(Mooney Rivlin or others) for Viton slow and Viton fast?
It will be very useful to me, for futher proceeding my projects.

Thanks,
With regards,
Billal