A new approach for the determination of the Iwan density function in modeling friction contact. (15th August 2020)

• Record Type: Journal Article
• Authors: Li, Dongwu; Botto, Daniele; Xu, Chao; Gola, Muzio
• Is Part Of: International journal of mechanical sciences. Volume 180(2020)
• Publication Date: 2020-08-15
• Subjects: Mechanical joints -- friction contact -- Iwan model -- density function -- hysteresis; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2020.105671
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: A new approach for simulating the friction hysteresis at joint interfaces is developed by combining the contact pressure distribution with the framework of the Iwan model. The physical meaning of the Iwan density function is explicitly given. The method is used to replicate a sphere-on-sphere contact and a flat-on-flat contact. The effectiveness of the proposed approach is validated by comparing simulations with analytical solutions and experimental results. Abstract: Friction between interfaces seriously affects the dynamics of structures with joints. An accurate description of the friction behavior, usually given in the form of hysteresis loops, is then a prerequisite for a successful prediction of the dynamics of joint structures. Driven by this demand, this paper proposes a new approach in the framework of the Iwan model to better simulate the nonlinear constitutive relationship of joints. The approach derives the Iwan density function from the contact pressure distribution on the joint interface, without having to assume it like traditional Iwan-type models. Following this, the corresponding force-displacement expressions can be obtained. The proposed approach is applied to two different contact geometries: sphere-on-sphere and flat-on-flat. For the spherical contact, comparisons between the simulated results and the analytical solutions available in the literature show perfect agreement. Moreover, the effectiveness of the approach in flat-to-flat contact is validated by comparing the simulated hysteresis loop with the experimental counterpart. Graphical abstract: Image, graphical abstract