弾性体の実効的な静摩擦係数に関する設計指針

概要

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In sliding friction of elastomers, the effective static friction coefficient μseff observed is not necessarily equal to the inherent real one μs possessed by the material; usually μseff < μs because of the elastic deformations of sliding objects and the propagation of shear fracture in the contact area. This indicates that focusing on elastic deformation of sliding objects can derive a new criterion of μseff for machine design. In this study, mainly through numerical simulations for a physical model assured by experiments in which measuring frictional force and observing contact area were carried out for a longitudinal line contact of polymethyl methacrylate, it is found that the stiffness ratio κ = Kbtot / Kctot (where Kbtot and Kctot are the total bulk stiffness and total tangential contact stiffness of the elastic sliding object, respectively) dominates the value of μseff.