The paper presents some aspects regarding the conception and construction of an experimental test rig used for studies concerning friction phenomenon of threads immersed in oil, maintained in a state of motion with constant velocity. The structure of the experimental test rig, testing methodology, experimental results and the applicability of the experimental set-up were detailed. To validate the experimental equipment and method, the obtained values were correlated with those obtained analytically. A good correlation was found, which attests the applicability of the test rig and method.
The present paper proposes an experimental test rig and methodology for the optical evaluation of micro-contact parameters in the case of micro-indentation tests of elastic materials with rigid indenters. Micro-contacts between small steel punches, of various shapes (considered rigid) and the flat surface of a synthetic glass (considered elastic), were investigated experimentally. The dimensions of the micro-indentation imprints determined by aid of laser profilometry were compared to theoretical results yielded by theoretical models from literature, [1, 2, 4], and good agreement was found. In order to verify whether the contact took place in the elastic or plastic domain, the tested surface was rescanned after a longer period of time, and it was determined that no remnant imprint was left. This confirms that the test was conducted in the elastic domain.
The paper aims is to present aspects regarding the evolution of contact mean pressure obtained in four balls standardized test, in order to highlight a correlation between contact mean pressure and the moment when the scuffing occurs. Different types of greases were used in tests to evaluate the contact loading capacity and the wear scar dimensions correlated with loading force. Several tests were conducted following the testing procedure described in EN ISO 20623:2003 international standard. Using a laser profilometer, the dimensions of the wear scar were obtained for all loading levels. The contact mean pressure was determined from the ratio between the normal contact load and wear scar area. The experimental values were compared with those based on Hertz equations. The evolution of contact mean pressure and wear scar area was related to scuffing occurrence.
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