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7.5.3 Linearization of the Contact Integral
Since equation (7.5.2-1) is nonlinear we need to calculate the linearization. For tied contact, this is simply given by the following equation. Where and We also introduced the notation .
The discretization of (7.5.3-1) will lead to a contribution to the stiffness matrix. Notice that due to symmetry between and this matrix will be symmetric.