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Optical Instrument Structural Design
Published in Paul Yoder, Daniel Vukobratovich, Opto-Mechanical Systems Design, 2017
Adhesive wear is a complex phenomenon and is related to friction. The Archard equation provides a very-rough-order-of-magnitude estimate of the wear of a sliding contact (Archard, 1953). This equation provides the wear volume VOL as a function of the material wear constant KM, sliding distance L, normal force FN, and hardness H. In this relationship, H is given as a force per unit area. Hence, KM is a dimensionless parameter: () VOL=KMFNLH
Comparative study on tribology and microhardness of laser synthesized Ti-Al2O3/Zn coatings on Ti-6Al-4V alloy
Published in Tribology - Materials, Surfaces & Interfaces, 2020
The tribology test (particularly coefficient of friction (COF)) on samples A, B, C and Ti-6Al-4V alloy was carried out by using a pin-on-disk tribometer (Anton Paar Germany GmbH, Ostfildern, Germany). A sample sectioned of 10 mm × 10 mm × 5 mm dimensions fixed onto sample holder was placed into tribometer; after then a tungsten carbide pin of diameter 6 mm incorporated within equipment slide onto the sample applying a downward load of 5 N for 1000 s at a speed of 5.24 cm/s. This sliding action produced circular tracks on the sample surface. The wearing track’s COF was recorded by TriboX software integrated within the computerized Anton Paar tribometer. Meanwhile, wear volume loss was calculated using the Archard equation (presented in Equation (1)) proposed by Archard [3]. The worn surfaces were examined by using SEM in order to study the possible wear mechanisms.where V is the volume loss (mm3); k is the friction coefficient; w is the applied load (N); s is the sliding distance (mm) and H is the microhardness (Pa).