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Question from a newbie to FEA

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mdighe

Materials
Joined
Jun 12, 2003
Messages
16
Location
US
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.
 
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
 
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