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Energy Losses of impacts with friction

Impacts with friction are typical for very many machine and mechanism problems. They arise by short-time contacts between two or more bodies, and they generate energy losses mainly due to friction in tangential contact direction but also by small dissipative effects in normal contact direction. During the last two decades a couple of impact models were established connected with the names of Moreau, Fremond and Glocker, which all work quite satifactorily with respect to practical applications. We shall focus on Glocker's model, for which some experimental verifications are available. A missing link are energy considerations, which are available, but nevertheless do not provide us with a complete information for all possible cases. The paper tries to fill a bit this gap, though the investigations are based on a combined phenomenological and theoretical basis. A theoretical consideration alone is not known to the author.
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