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Digital images of contact parameters and wear study in tribosystems

100%

Myshkin N. K. , Markova L. V. , Konchits V. V.

1999

tom Vol. 4, no spec.

161-166

A technique of easy-to-interpret presentation of physical parameters (friction coefficient and electrical contact resistance) recorded in the course of friction tests is proposed. The technique is based on construction of digital "triboscopic images" as 3D map. The map includes space and time (or number of cycles) coordinates; the third coordinate is brightness ("grey level ") reflecting the value of a given parameter. The map gives evident information on surface wear uniformity, transfer process, wear particles formation and their displacement in the contact zone, scratch formation, etc. Examples of best data presentation and interpretation of results are presented. The triboscopic images are shown to be an important quantitative tool in microtribology.

Hardmetals characterization by tribological means

84%

Ścieszka S. F. , Grzegorzek W. , Żołnierz M.

2013

tom Vol. 59, nr 2

86--98

Purpose: The objectives of the paper are as follows. Firstly the presentation of new and reliable integrated testing method, in which conjoin action involving fracture and abrasion of hardmetals is carefully monitored and analysed, and secondly the evaluation of the empirical relationship between mass loss as a result of edge chipping during the initial transition stage of abrasive wear and fracture toughness in the form of formula. Design/methodology/approach: The tests were performed in a purpose-built testing machine. The apparatus consists of the disc rotating in the cylindrical chamber under normal force. The specimen bars, made from the hardmetals are attached to the upper side of the disc. The results from this testing show that by using one apparatus and one shape of the test specimen it is possible to obtain a reliable rating of hardmetals. Findings: The integrated testing method required a theoretical or empirical model which describes the relationship between fracture toughness, other mechanical properties and the test’s fracture indicator. The best correlation received was for empirical model based on study on abrasive wear by lateral cracking. Practical implications: The proposed method offers advantages when used in hardmetals development programmes to rank a large number of materials in terms of abrasion and fracture resistance. Originality/value: The innovative method enables the evaluation of abrasion and fracture resistance, one shape of specimen, and one testing procedure.