Influence of surface roughness and contact load on friction coefficient and scratch behavior of thermoplastic olefins

Jiang, Han; Browning, Robert; Fincher, Jason; Gasbarro, Anthony; Jones, Scooter; Sue, Hung‐Jue

doi:10.1016/j.apsusc.2008.01.067

Cited by 109 publications

(68 citation statements)

References 25 publications

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“…Without considering plastic sliding, 8,20,21 the contribution from SDFC grows with an increasing indentation depth and further leads to a rising SFC, which is not true in some cases for current models.…”

Section: B Schematics Of Scratch Contactmentioning

confidence: 98%

“…[8][9][10][11]20, and 21, the friction stress τ τ x , τ y in Eq. (1) is not the simple multiplication of the CFC µ and normal pressure σ n , but it may depend on yield strength in shear τ y .…”

Section: B Schematics Of Scratch Contactmentioning

confidence: 99%

“…In addition, additive decomposition of the scratch friction coefficient µ s = µ + µ d into traditional µ and surface deformation µ d components is widely accepted (see Refs. 8,20,and 21). It is generally accepted that with the growth of the indentation depth (or normal loading), the contribution from the surface deformation friction coefficient µ d increases, which leads to a rising scratch friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tribology behavior during indentation and scratch of thin films on substrates: effects of plastic friction

Feng

Chen

2015

AIP Advances

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When friction stress on a contact surface reaches material yield strength in shear, contact slippage can occur even if the slipping condition for Coulomb friction is not satisfied. In this paper, a three-dimensional (3-D) scratch model is proposed, which considers combined Coulomb and plastic friction. Influences of plastic friction are discussed for two continuous displacement loading steps: indentation and scratch. For indentation, initially the sliding on the contact surface can not take place and the complete cohesion condition should be employed; then as the indenter is further compressed down to the coating surface, plastic friction instead of Coulomb friction prevails in most of the contact region. For scratch, the previous complete cohesion at the initial indentation is substituted by plastic or Coulomb slipping, and the slippage becomes plastic-sliding governed for a slightly large indentation depth. The effects of the indentation depth and the Coulomb friction coefficient on the scratch friction coefficient are discussed in detail. Several experimental phenomena are interpreted, which include that with an increase of the normal loading, the scratch friction coefficient reduces for the soft coating but grows for the hard coating; and with the growth of hardness after heat treatment, the scratch friction coefficient increases due to weak plastic slippage. Obtained results help to elucidate tribological behaviors during scratch and are helpful for the interpretation of experimental phenomena and the improvement of numerical simulations for the scratch process.

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Section: B Schematics Of Scratch Contactmentioning

confidence: 98%

Section: B Schematics Of Scratch Contactmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tribology behavior during indentation and scratch of thin films on substrates: effects of plastic friction

Feng

Chen

2015

AIP Advances

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“…Both the Ra and Rz values of the surface increased more than ten-fold after laser remelting. It is widely accepted that surface roughness played a significant role in determining the friction, as it directly controlled the actual contact area between the touching surfaces during sliding [45]. It should be noted that while laser remelting of the CoCrMo surface demonstrated a friction-reducing effect for all the tribopairs (Figure 2), wear properties displayed diverse effects depending on the tribopair (Figures 3-6).…”

Section: Surface Roughness Measurementsmentioning

confidence: 99%

“…directly controlled the actual contact area between the touching surfaces during sliding [45] (Figure 2), wear properties displayed diverse effects depending on the tribopair (Figures 3-6…”

Section: Vickers Microhardness Testsmentioning

confidence: 99%

A Preliminary Study to Enhance the Tribological Performance of CoCrMo Alloy by Fibre Laser Remelting for Articular Joint Implant Applications

2018

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Abstract:CoCrMo alloy has long been used as a pairing femoral head material for articular joint implant applications because of its biocompatibility and reliable tribological performance. However, friction and wear issues are still present for CoCrMo (metal)/CoCrMo (metal) or CoCrMo (metal)/ultrahigh molecular weight polyethylene (UHMWPE) (plastic) pairs in clinical observations. The particulate wear debris generated from the worn surfaces of CoCrMo or UHMWPE can pose a severe threat to human tissues, eventually resulting in the failure of implants and the need for revision surgeries. As a result, a further improvement in tribological properties of this alloy is still needed, and it is of great interest to both the implant manufacturers and clinical surgeons. In this study, the surface of CoCrMo alloy was laser-treated by a fibre laser system in an open-air condition (i.e., no gas chamber required). The CoCrMo surfaces before and after laser remelting were analysed and characterised by a range of mechanical tests (i.e., surface roughness measurement and Vickers micro-hardness test) and microstructural analysis (i.e., XRD phase detection). The tribological properties were assessed by pin-on-disk tribometry and dynamic light scattering (DLS). Our results indicate that the laser-treated surfaces demonstrated a friction-reducing effect for all the tribopairs (i.e., CoCrMo against CoCrMo and CoCrMo against UHHMWPE) and enhanced wear resistance for the CoCrMo/CoCrMo pair. Such beneficial effects are chiefly attributable to the presence of the laser-formed hard coating on the surface. Laser remelting possesses several competitive advantages of being a clean, non-contact, fast, highly accurate and automated process compared to other surface coating methods. The promising results of this study point to the possibility that laser remelting can be a practical and effective surface modification technique to further improve the tribological performance of CoCr-based orthopaedic implants.

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Scratch Behavior of Polymers

Molero

Sue

2021

Encyclopedia of Polymer Science and Technology

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The apparent simplicity of scratch deformation is deceiving. The viscoelastic nature and complex constitutive behavior of polymers contribute to the complexity of the scratch testing and analysis. This article discusses how various experimental factors and material parameters influence the scratch behavior of polymers. Furthermore, significant advances have been made in the modeling of polymer scratch behavior using finite element methods, which supplements the experimental findings to offer a comprehensive understanding about how damage forms and evolves during the scratching process. This article emphasizes how the surface characteristics, material properties, and stress state and its magnitude can profoundly influence scratch damage mechanisms. By understanding the relationship between material properties and scratch behavior, the material properties needed to prevent the formation of undesirable scratch damage can begin to be assessed and even predicted. It is hoped that the information in the present article can help scientists and engineers identify the factors governing the scratch performance of polymers in order to develop polymers with superior scratch‐proof properties for vast engineering applications.

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Influence of surface roughness and contact load on friction coefficient and scratch behavior of thermoplastic olefins

Cited by 109 publications

References 25 publications

Tribology behavior during indentation and scratch of thin films on substrates: effects of plastic friction

Tribology behavior during indentation and scratch of thin films on substrates: effects of plastic friction

A Preliminary Study to Enhance the Tribological Performance of CoCrMo Alloy by Fibre Laser Remelting for Articular Joint Implant Applications

Scratch Behavior of Polymers

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