This paper deals with a study the linear finite element approximation of a piezoelectric Signorini's contact problem with and without friction. We derive error estimates that depend on the penalty parameter 𝜀 and the mesh size ℎ. Moreover, under some regularities of the solution to the contact problems and some requirements on parameters 𝜀 and ℎ, we provide results on the convergence rate of the finite element approximation of the penalized solution.

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