Metallurgical re-examination of wear modes II: adhesive and abrasive

Bhushan, Bharat; Davis, Robert E.; Kolar, H. R.

doi:10.1016/0040-6090(85)90013-6

Cited by 29 publications

(14 citation statements)

References 8 publications

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“…Yoshida and co-workers 17 have discussed the densification of glasses caused by indentation. Now consider the findings of Bhushan et al 18 that microhardness measurements of worn metal samples show a 10%-80% increase of hardness in the worn layer. While the behavior of the metals is different from that of polymers because the latter are viscoelastic, a possible connection between the characteristics of the groove profiles we have obtained with hardness determination seemed worth pursuing.…”

Section: Densification and Hardnessmentioning

confidence: 96%

Grooves in scratch testing

et al. 2007

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For a number of polymers with a variety of chemical structures and different properties, we have performed scratch-resistance tests and investigated the profiles of the grooves formed using a profilometer. Three main kinds of material response are seen: plowing; cutting; and densification. The cross-sectional areas of the grooves include the groove and side top-ridge areas. The latter are smaller than the former, an indication of densification at the bottom and the sides of the groove; the effect can be connected to molecular dynamics simulations of scratch testing. The sum of the groove and top-ridge areas is the highest for Teflon, thus providing another measure of its poor scratch resistance. The Vickers hardness of the polymers was also determined. An approximate relationship exists between the hardness and the groove area. An unequivocal relationship between the hardness and the total cross-sectional area of the material displaced by the indenter is found. The resulting curve can be represented by an exponential decay function.

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Section: Densification and Hardnessmentioning

confidence: 96%

Grooves in scratch testing

et al. 2007

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“…Wear includes six principal, quite distinct phenomena that have only one thing in common: the removal of solid material from rubbing surfaces (Burwell, 1957(Burwell, /1958Kragelski, 1965;Engel, 1976;Eyre, 1976;Rigney and Glaeser, 1978;Bhushan et al, 1985aBhushan et al, , 1985bZum Gahr, 1987;Bayer, 1994;. Wear includes six principal, quite distinct phenomena that have only one thing in common: the removal of solid material from rubbing surfaces (Burwell, 1957(Burwell, /1958Kragelski, 1965;Engel, 1976;Eyre, 1976;Rigney and Glaeser, 1978;Bhushan et al, 1985aBhushan et al, , 1985bZum Gahr, 1987;Bayer, 1994;.…”

Section: Types Of Wear Mechanismmentioning

confidence: 99%

“…A scanning electron microscope (SEM) micrograph of a stainless steel shaft surface after adhesive wear by sliding in a stainless steel journal bearing under unlubricated conditions is shown in Figure 7.2.3 (Bhushan et al, 1985b). Evidence of adhesive debris pullout can be clearly seen.…”

Section: Adhesive Wearmentioning

confidence: 99%

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Wear

2013

Introduction to Tribology

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“…For the particles that are softer than the other two materials, these particles highly yield and thus become flat or fragmented during the wear process (Khruschov, 1974). When the third particles are harder than the other two materials, such particles may be trapped by one of the two materials and plough another one (Bhushan et al, 1985), as shown in Fig. 2 present, when the load is small or the other two materials have smooth surfaces.…”

Section: Tribology Under Two-body and Three-body Contactmentioning

confidence: 99%

Molecular dynamics study on tribological behaviors of DLC films

Bai¹

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Diamond-like carbon (DLC) films that are a type of amorphous solids exhibit excellent mechanical properties and superior tribological performances and thus can be used as the coating of workpieces to improve their wear resistance and reduce their surface friction. The tribological behaviors of the DLC films are sensitive to many factors such as the film compositions, operational parameters and environment. These sensitivities highly complicate the tribological mechanisms of the DLC films and largely degrade their reliability and performances. Due to the difficulty to observe the evolution of the contact interfaces, particularly their detailed atomic structures at the nanoscale, investigation of the tribological mechanisms of the DLC films is challenging. Molecular dynamics (MD) simulation is a powerful technique used to investigate the nanoscale physical and chemical phenomena which can hardly be observed in experiments. This PhD dissertation adopts MD simulation as the main approach to investigate the nanoscale tribological mechanisms of DLC films under different operational conditions. The effects of the load, velocity and the surface roughness of DLC films on their tribological behaviors are studied for two-body contact cases in which a diamond tip slides against a DLC film. It is found that the increase of the load can induce transition of wear from adhesive to abrasive and highly increase wear rate of the film. Its friction force follows the macroscale Bowden-Tabor model at a small load, but diverges from such model at a large load due to the formation of transfer layers. This keeps consistent with experimental observations in literature and thus demonstrates that the macroscale tribological mechanisms are still valid at the nanoscale. The friction force and wear rate of the film decrease with the velocity due to the reduction of the sliding depth of the diamond

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Metallurgical re-examination of wear modes II: adhesive and abrasive

Cited by 29 publications

References 8 publications

Grooves in scratch testing

Grooves in scratch testing

Wear

Molecular dynamics study on tribological behaviors of DLC films

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