Modeling and experimental characterization of contact boundary tractions in non-conforming contact with random defects

An experimental characterization method for the non-conforming contact with random defects is developed in this paper. The method consists of the mechanics modeling and the parameters inversion algorithm. In the modeling, a new contact boundary description method is developed, which can sensitively characterize the discontinuous contact area caused by random defects. In the parameters inversion algorithm, an innovative objective function is designed by comprehensively considering the matching degree of displacements, the stability and singularity of boundary tractions. Combined with an iterative optimization method, the inversion algorithm can accurately identify random defects at different scales and characterize the evolution of contact boundary tractions. Numerical and experimental examples demonstrate that the method can provide reliable reconstruction results based on the displacement data.