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The rebound indentation test consisting of the displacement-controlled andload-controlled stages is considered for a frictionless cylindrical flat-endedindenter. The mechanical behavior of an articular cartilage layer sample ismodeled in the framework of viscoelastic model with time-independent Poisson'sratio. Closed-form analytical expressions for the contact force (in thedisplacement controlled stage) and for the indentation displacement (in theload-controlled stage) are presented for an arbitrary viscoelastic solid model.The case of standard viscoelastic solid model is considered in detail. It hasbeen established that the rebound displacement (that is the indentationdisplacement in the load-controlled stage) does not depend on the relaxedelastic modulus and Poisson's ratio as well as on the layer's thickness.

Flat-ended rebound indentation test for assessing viability of articular cartilage: Application of the viscoelastic layer model