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Model couplings: Integration vs. Summation over nodes

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Hello,

I am working with two modules Structural Mechanics and general form PDE as coupled. I need a model coupling to define an integration. When I choose "Summation over nodes", my model works fine, converges and gives logical results except the fact that it calculates my volume incorrectly, which I think is related to the mesh. When I select "Integration", I see that my model calculates my volume correctly as the initial value; however, my model hits the maximum memory and gives "out of memory" error. I use this integration operator inside the PDE and there are terms like Elastic modulus, strain energy and DiracDelta function inside the operator.

Could any body have a suggestion for me?

Thank you in advance.
Onur

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