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We consider the unilateral contact problem between an elastic body and arigid foundation in a description that includes both Tresca and Coulombfriction conditions. For this problem, we present an a posteriori erroranalysis based on an equilibrated stress reconstruction in theArnold--Falk--Winther space that includes a guaranteed upper bounddistinguishing the different components of the error. This analysis is thestarting point for the development of an adaptive algorithm including astopping criterion for the generalized Newton method. This algorithm is thenused to perform numerical simulations that validate the theoretical results.

An a posteriori error analysis based on equilibrated stresses for finite element approximations of frictional contact