Simulate adhesion between rubber and plastic?

[bongirs]

Hello,

I have received a task of simulating a difficult scenario.
Rubber (Elastollan 1185A) is over moulded over a plastic part (PBT GF20).
The rubber stays on the part due to adhesion between the contact region.
My task is to simulate the situation where the rubber peels off from the plastic part due to pinching force applied on the rubber.
I am unable to comprehend how to simulate this?

Also the available material data for both the materials is limited (from vendor's material sheet): UTS, Poisson's ratio, Breakage Strain, etc.
For both materials I have the stress-strain curves: plastic being elasto-plastic and rubber being hyper-elastic.
I have already created materials in Creo Simulate for the same but don't know how to proceed further?
Also is the co-efficient of friction between the 2 surfaces required? I do not have this...
Any guidance in this activity would be very helpful.

 

[rstupplebeen]

You are going to need to get the adhesion force between the 2. I would create specific test samples with these 2 materials bonded. You will want similar processing and surface finishes on the molds.

Depending on your geometry you may be able to load up the actual part in a load frame to create these values by iterating the adhesion properties in the simulation. I hope this helps.

Rob Stupplebeen

http://www.optimaldevice.com

 

[bongirs]

Hello Rob,

It looks like there is no other alternative to practical experimentation of adhesive force between these 2 materials.
Although I can understand this, it is difficult to explain this to higher management

 

[rstupplebeen]

How about the analogy between burning eggs on to a stainless steel pan vs a non-stick pan. The egg is the silicone and the pan is the plastic part. The interface of the 2 materials is drastically different.

I hope this helps.

Rob Stupplebeen

http://www.optimaldevice.com