Numerical Analysis of Fretting Wear With a Hybrid Elastoplastic Friction Model

Abstract

Frettingwear is a common problem in different industries, especially when it comes to interactions between metallic components. Flowinduced excitation forces in heat exchangers for instance cause tubesupport interactions. The longterm interaction is an important phenomenon, which may cause frettingwear of the tubes. Experimental tests of the interaction show the occurrence of stick–slip intermittent behavior in the tube response. To precisely simulate the intermittent stick–slip behavior, it is crucial to refine the conceptual model of the coefficient of friction for the entire motion from absolute zero velocity to gross slip phase. The incorporated friction model plays an important role in the determination of the level of frettingwear in the system. The friction model should satisfy two important criteria. The first important aspect is the strategy of the friction model to detect the cessation of sticking, the beginning of partialslipping, and establishment of the sliding region. The second important aspect is defining a friction coefficient function for the entire system response to precisely represent the transient stick–slip regions. In the present work, the velocitylimited friction model was compared with the LuGre model, which is a ratedependent friction model. The effect of varying the breakaway force and Stribeck effect on the stick–slip region were also investigated. Furthermore, the criteria to demarcate the stick–slip region in the LuGre model are discussed, and a different method to incorporate the Stribeck effect and presliding damping in the Dahl friction model is proposed. Using the tangential stress distribution in the contact area, a new hybrid springdamper friction model is developed. The model is able to estimate the elastic, plastic, and partialslipping distances during the relative motion. The ability of the model to reproduce experimental tests is investigated in the present work.