Abstract
Most mechanical systems (in particular, gear transmission system) undergo relative motion which results in increased friction phenomenon (friction coefficient, stresses, and wear rate) and thereby results in loss of efficiency. Mechanical parts undergo relative motion in different geometry configurations and orientations that induce a different state of stress as a result of friction. Till date, attempts are being made to minimize the friction with full sphere pin geometry configuration. The present work focused to reduce the frictional and wear rate, and experiments are conducted with tribo-pairs. i.e., nickel-coated pin surface slide against Al6061 alloy disc. The friction studies are carried out at different loads and geometries of pin surfaces (sphere and hemisphere configured at different orientations such as full sphere and hemisphere configured at 0°, 45°, and 90°) to induce different stress states with reference to sliding directions. Change in the geometry of EN8 pin material and their orientation with reference to sliding direction resulted in a different state of stress. The resulting stress levels were examined under the scanning electron microscope, which revealed the mechanisms of adhesion, abrasion, and extrusion. At a lower magnitude of orientation and load, the extent of asperity breaking lessens and material removal from pin surface decreases. Abrasion wear mechanism was observed corresponding to full sphere configuration on Al 6061 disc, whereas adhesive wear mechanisms are seen with hemisphere pins. The amount of aluminum transfer on pin surface with a hemisphere pin is comparatively more than that of full sphere configuration. At a lower magnitude of state of stress, the mechanism of sliding was dominated by the adhesion effect. At a higher level of state of stress, the mechanism of sliding was dominated by abrasion and extrusion.
Highlights
Interface quality in moving parts is of practical significance to ensure proper function in the mechanical system [1, 2].e drag and frictional forces are minimized due to their longitudinal ribs of shark, and tree frogs grip even on the smooth surface at wet environment due to their surface features [3, 4]. ese observations ensure the study of surface properties, and their design for better performance in moving parts is of industrial relevance [5, 6].Al alloys are extensively used in many industrial and household applications [7, 8]
Attempts are being made to enhance the tribological characteristics of two forge, and customary gear materials are evaluated [15]
Tests are conducted to examine the performance of planetary gear transmission-based CNC bending machine [16]. e tribological characteristic examination was performed on the pin-on-disc test rig against the different shaft materials (EN8 and EN24) with Al 6061 alloy under dry and wet conditions (SAE 20W50) [17]
Summary
Shiv Pratap Singh Yadav ,1 Avinash Lakshmikanthan ,1 Siddappa Ranganath, Manjunath Patel Gowdru Chandrashekarappa ,3 Praveena Bindiganavile Anand ,1 Vijay Kumar Shankar ,1 and Muralidhar Avvari 4. Mechanical parts undergo relative motion in different geometry configurations and orientations that induce a different state of stress as a result of friction. E friction studies are carried out at different loads and geometries of pin surfaces (sphere and hemisphere configured at different orientations such as full sphere and hemisphere configured at 0°, 45°, and 90°) to induce different stress states with reference to sliding directions. Change in the geometry of EN8 pin material and their orientation with reference to sliding direction resulted in a different state of stress. Abrasion wear mechanism was observed corresponding to full sphere configuration on Al 6061 disc, whereas adhesive wear mechanisms are seen with hemisphere pins. At a higher level of state of stress, the mechanism of sliding was dominated by abrasion and extrusion
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