The paper is devoted to identification of the hysteresis behavior of materials by using a coupled Bouc-Wen-Preisach model. The material is view as an aggregate of grains which act as rigid vibrating units, while the contacts between them - the bond system constitute a set of interfaces that control the behavior of the material. The interfaces have the typical size of micrometer. In this paper we describe highly asymmetric hysteresis loops by using a friction contact model for the interface between moving grains that involving both tangential and normal relative motions. The proposed strategy is capable to predict the transition between stick, slip and separation of grains.
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