A Study on the Tribological Behavior of Surface Texturing on Babbitt Alloy under Mixed or Starved Lubrication

A study on galling initiation in friction coupling stretch bending with advanced high strength hot-dip galvanized sheet

“…Macroscopically, such roughening and protrusions created deeper pits (Fig. 4(e)) to entrap lubricant [24], causing lubricant devastation or insufficiency downstream of the pits and promoting direct contact between interfacial surfaces. As sliding proceeded under the application of normal force, the direct contact of the hard asperities on the downstream of die surface thus extruded gradually to enlarge these pits.…”

“…Such wear smoothing only lasted for only a short period because: (i) the consequence of reducing direct contacts meant the increase in local contact pressure to piercing depth in creating more severe peeling/ploughing, and/or the generation of higher friction heat to fuse and form weld contact; (ii) the pits (Fig. 4(e)) tended to trap lubricant to cause devastation/lacking of lubricant somewhere downstream of the pits, which would yield more severe wear (see Paragraph 7 in Section 3.2); (iii) the spread of lubricant in pits meant insufficient lubricant elsewhere under mixed and/or boundary lubrication condition, which would result in collision of the front of material transfer patches onto the downstream edge of the pits [24], detaching more flakes-this enlarged pit area large enough for sinking the zinc transferred patches in and to spall further downstream zinc off in connecting pits to form grooves and rifts; and (iv) the forming of continuous grooves and rifts further devastated the lubricant in the interfacial surfaces, which subsequently localized the friction heat to fuse the contacts between the zinc transferred patches on die and the rifts on strip surface-this subsequently resulted in galling, The combination of few and all factors described above elucidated how the detrimental deterioration of lubrication resulted in severe plastic flowing (Fig. 4 (i)) in zinc coating to cause finally scratching on the surface of the strip (Fig.…”

Nano Diesel Soot Particles Reduce Wear and Friction Performance Using an Oil Additive on a Laser Textured Surface

“…Zhang et al [4] studied the tribological performance of sliding bearings in mixed or starved lubrication regimes. Square textures in linear radiating arrays were ablated on the surface of Babbitt alloy disks through laser radiation.…”

Experimental Analysis of Grease Friction Properties on Sliding Textured Surfaces

“…In mixed lubrication conditions, this additional lift in hydrodynamic pressure alters the balance between hydrodynamic and boundary lubrication, and consequently, the number of asperities in contact decreases, and friction and wear likewise decrease [16]. In boundary and dry contact lubrication conditions, these craters (dimples or grooves) act as lubricant micro-reservoirs for the continuous retention and supply of lubricant [17], or as micro-containers to capture wear debris and contamination particles so that plowing decreases [18,19]. Consequently, abrasive wear and friction are reduced.…”