Development of Multimodal Fretting Wear Test System and Experimental Research

Minhao Zhu*, Jifan He, Jinfang Peng

School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031

ABSTRACT: Fretting damage exists widely in all fields of modern industry, it is called the cancer of modern industry. Due to limited by lack of experimental measures, the domestic and foreign researches focus mainly in tangential fretting mode up to now, and is still not enough in-depth study, moreover, the test methods and standards have not been unified. With the rapid development of national major projects and high-end equipment, the phenomenon of fretting in practical projects is often characterized by extreme service conditions and complex operation modes, which brings difficulties to the theoretical research and engineering application of damage mechanism. Therefore, the development of a full-featured fretting test instrument and innovative damage detection technology are of great significance to enrich the fretting theory and provide theoretical guidance for anti-fretting damage engineering protection. Based on the demand of the development of fretting tribology, this research integrated the most advanced motion drive mode at present, adopted the principle of modular design, and developed a multi-mode fretting scientific instruments. Through the design, optimization and implementation of precision mechanical structure, high-precision measurement control, multi-functional man-machine interface, etc., the test system took both advanced and completeness into consideration. Fretting wear tests for any basic modes (Tangential, Radial, Torsional, Rotational) and composite modes (Impact-Tangential, Radial-Tangential, Radial-Torsional, and Torsional-Rotational), as well as real-time detection of energy dissipation at the friction interface were realized. The test results showed that the system has well extensibility, and the displacement amplitude can span from fretting (0-100μm) to sliding (1-20mm). The control accuracy of linear displacement and angular displacement were better than 0.1μm and 0.01° respectively, and the corresponding technical indicators are at the international advanced level. On the basis of the above test equipment, multi-mode and high-throughput fretting wear tests were carried out based on unified test standards and genomic research methods of friction effects. The characteristics of energy dissipation and material damage under different fretting modes and complex environmental are revealed, which provided data support for the establishment of a database of fretting behavior and damage mechanism covering all basic and composite modes.

Keywords: Fretting wear; Multimodal; Friction effect genome; High throughput