Question from a newbie to FEA

[mdighe]

Hi

I am a relatively new user of FEA. I am using MSC Nastran for windows.

I am working on a solder joint modelling. As a first step I have picked a very simple model, to learn the technique to solving a joint.

The model consists of a lead-tin plate sandwiched between two copper plates. I am assuming a perfect bonding between the plates.

I am loading the part in tension.

I have checked for coincident elements.

When I run the analysis, I get fatal errors. The number of fatal errors is always equal to the number of coincident points.

I understand I have to connect the coincident nodes. But I don't know how to do it correctly.

Any help in this will be appreciated. Are there any articles that tell how to analyze bonded structure?

Thanks in advance.

 

[pjhype]

You should merge the coincident nodes on the interface. Otherwise, you will need to connect them using rigid elements.

There is quite a lot of literature on bonded joints. You might want to check the Journal of Composite Materials (ASME). Most of the bonded joint problems were solved in the early-1980's.

pj