Abstract
In this paper we demonstrate a new method for analyzing and visualizing friction force measurements of meso-scale stick–slip motion, and introduce a method for extracting two separate dissipative energy components. Using a microelectromechanical system tribometer, we execute 2 million reciprocating sliding cycles, during which we measure the static friction force with a resolution of and the displacement with a resolution of . We plot the lateral force as a function of the real contact position by compensating for the values of the spring constants of the system. This allows all friction loops to be combined in a single hexagonal bin plot, which clearly shows the evolution of the friction force magnitude and its distribution across the sliding track. We identify all individual slip events in the entire experiment using a thresholding algorithm. This allows us to show the evolution of the slip event count, the static friction force, and the coefficient of friction. Crucially, it allows us to disentangle the dissipated energy into two components: the dynamically dissipated energy, which is associated with slip motions, and the semi-statically dissipated energy, which is related to small contact deformations, plastic yield and other non-elastic behavior. Our technique provides new insight into the mechanics of stick–slip motion in multi-asperity contact systems, and paves the way towards a better understanding of the physics of meso-scale friction.
Highlights
In our original manuscript [1], we introduced a new type of friction loop, in which the lateral force was plotted as against the x-position of the contact point on the sliding surface, instead of an equivalent of the cantilever support position of a friction force microscope (FFM)
The design is based on the Leiden microelectromechanical systems (MEMS) tribometer [20], and it was fabricated in the commercial PolyMUMPS multi-user fabrication process by MEMSCAP Inc
Our visualizations of the individual friction loops in figure 6, the aggregated quantities shown in figure 7 and the dissipated energy together paint an indirect yet lively picture of the events that occurred at the contact
Summary
In our original manuscript [1], we introduced a new type of friction loop, in which the lateral (friction) force was plotted as against the x-position of the contact point on the sliding surface, instead of an equivalent of the cantilever support position of a friction force microscope (FFM). These loops are more intuitive than traditional FFM-style friction loops.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
