Programmable/Controllable Friction in Tribology
A special issue of Lubricants (ISSN 2075-4442).
Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 9140
Special Issue Editors
Interests: tribology; water-based lubrication; ionic liquids; programmable friction; graphene
Special Issues, Collections and Topics in MDPI journals
Interests: polymer synthesis; design of stimuli-responsive materials
Special Issue Information
Dear Colleagues,
Every mechanical movement causes friction. The effects are immense worldwide: more than 20% of energy consumption is caused by friction. In addition to the material wear that occurs, friction is one of the determining factors for the efficiency, reliability and service life of components and systems. Accordingly, the use of lubricants to reduce friction and wear is widespread. Whether in a wind turbine, a vehicle transmission or in the manufacturing industry (machine tools, printing presses, pumps), each application requires an individually tailored lubrication system to optimize friction and wear behavior, where material and lubricant interact.
The conventional philosophy in developing tribological systems for a particular application is to passively optimize the lubricant (e.g., additives, viscosity) and the friction partners (e.g., coating) in advance. As a result, although these systems operate over the full range of operating parameters, they do not always operate at the optimum tribological condition because friction conditions can change constantly. Normal forces and speeds are usually dynamic, such as when a car is starting. This changes the temperatures caused by frictional heat and thus possibly the friction regime. In addition, the wear and aging of the lubricant can occur with increasing operating time.
The solution to these problems would be to develop lubricants whose properties can be selectively and actively changed during operation by an external stimulus. Programmable materials are materials or material compositions that are constructed in such a way that their properties can be specifically controlled and reversibly changed. Complex and locally different functions can be programmed into these materials. Depending on the application and situation, the material then assumes different states and material properties initiated by external triggers.
An intrinsically variable system based on programmable friction that dynamically optimizes frictional contact offers enormous technical potential, especially for plain or rolling bearings and couplings.
In this Special Issue, the latest research results in the field of friction control based on different mechanisms and methods are presented. Topics covered include:
- Mechanisms of controllable friction;
- All types of triggers for controlling friction;
- Experimental studies of controllable friction;
- Modeling and simulation of surface interactions;
- Transferability to technical applications.
“Friction can be both beneficial and detrimental – control is the key.” Curtis, C.K., Streator, J.L. and Krim, J., 2020, Friction. In Surface and Interface Science, K. Wandelt (Ed.).
“Tribotronics combines electronics and tribology to develop machines that can adapt to the operating conditions” Tysoe, W.T.; Spencer, N.D. Tribology & Lubrication Technology; 77, 2021
Dr. Tobias Amann
Dr. Stefan Reinicke
Prof. Dr. Jürgen Rühe
Guest Editors
Manuscript Submission Information
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Keywords
- friction
- wear
- ionic liquids
- surface interaction
- tunable friction
- controllable friction
- programmable friction
- intelligent tribosystems
- energy efficiency
- sustainability
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