An Experimentally Based Mortar Cell Method Model for Electrical Interconnects

A 3D domain decomposition approach for analyzing electro thermal contact problems is presented. The computational domain is subdivided into non overlapping regions discretized according to the Cell Method, where variables and field equations are expressed directly in integral form suitable for coupling the contact problem to the electro thermal one in the bulk regions. The electrical and thermal continuity between contacting regions is enforced by means of dual Lagrange multipliers as in mortar discretization methods. Contact resistance measurements are used to calibrate the parameters of the electrical constitutive equation, modeling voltage drops and power losses at the contact interface.