Short note on improved integration of mechanical testing in predictive wear models

Liskiewicz, Tomasz; Beake, Ben D.; Schwarzer, Norbert; Davies, M. I.

doi:10.1016/j.surfcoat.2013.07.044

Cited by 20 publications

(21 citation statements)

References 34 publications

(35 reference statements)

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“…It is also possible and has been shown previously that the nano hardness values of DLC coatings (as measured by nano indentation) can and do vary with the indentation depth employed. This is especially true for a-C:H DLCs which see increased hardness at greater nano indentation depths (35). Therefore it could be the case that wearing into the coating has facilitated this observed increase in hardness, by virtue of being a greater nano indentation depth.…”

Section: Coating Attributesmentioning

confidence: 97%

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

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Diamond-like Carbon coatings are well-known for their excellent wear and friction reducing properties. Novel DLCs are constantly being developed that further these beneficial characteristics; this is often achieved by incorporating a dopant into the microstructure of the DLC. One dopant that is widely used currently in commercial settings, including F1 car engines, is silicon. Si doping can be, to some extent, regarded as a double-edged sword. This is because, whilst it has been reported as being able to reduce friction in certain environments, this usually comes at the cost of far higher wear than the corresponding un-doped DLC. The fundamental aspects of Si-DLC's friction and wear properties are explored herein with the goal of optimising the coating using fundamental tribochemical knowledge.

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Section: Coating Attributesmentioning

confidence: 97%

Repressing oxidative wear within Si doped DLCs

Lanigan

Wang

Morina

et al. 2016

Tribology International

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“…Diamond-like carbon (DLC) is a metastable form of amorphous carbon and has a mixture of sp 3 and sp 2 bonding and the mechanical properties of DLC films vary with sp 2 /sp 3 ratio [1]. A wide range of available amorphous carbon coating architectures and a number of possible deposition methods allow tailoring of the coating functionality to many demanding functional surface applications.…”

Section: Introductionmentioning

confidence: 99%

“…Analytical tools for nano-scale materials testing have rapidly developed over the last decades and integration of measurement data obtained from nano-mechanical testing provides reliable inputs to improved predictive coating wear models [3,4].…”

Section: Introductionmentioning

confidence: 99%

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Beake

Liskiewicz

Vishnyakov

et al. 2015

Surface and Coatings Technology

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DLC coatings can combine high hardness with low friction. However, they are often deposited with high levels of intrinsic stress and display low adhesion strength resulting in poor performance in demanding applications. A highly topical challenge is to develop advanced DLC coatings capable of withstanding more demanding applications in the automotive, cutting tools, MEMS and oil and gas sectors. The results from several nanomechanical and tribological test techniques -nanoindentation, nano-scratch and nanofretting (nano-wear) -can be used together to aid the design of DLC coating architectures for enhanced durability in specific applications. In this study the behaviour of multilayered DLC coatings (Cr/W-C:H/a-C:H, Cr/W-C:H/Si-a-C:H) was compared to that of CrN/a-C:H:W (WC/C). We have previously reported that in nano-wear tests the coating with the highest hardness and H/E displayed greater wear resistance [T.W. Liskiewicz et al, Surf. Coat.Technol. 237 (2013) 212]. By employing nano-and micro-scale tribological testing with probes of differing sharpness it is possible to change the sensitivity of the test to probe the response of the coating top layer or the entire multilayer coating-substrate system. In the nano-scratch tests using a spherical indenter with a 5 m end radius the maximum stresses are located well within the top layer of the multilayer coatings and consequently the mechanical properties of this top layer dominate the nano-tribological behaviour. In the micro-scratch using a 25 m spherical probe the stress field extends further towards the sublayers and steel substrate and consequently the behaviour is completely different. Under these conditions the coating with the lowest hardness and H/E showed improved performance with higher critical loads for cracking and total coating failure. High resolution SEM imaging has been used to investigate this further. A simple contact model strongly suggests that cracking and failure events occur on the harder coatings when the maximum von Mises stress was located close to the interfaces in the multilayer systems.3

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“…Within a variety of examples the procedure or parts of it have already been applied [7][8][9][10][11][12][13][14]. Here now, we want to deepen the analysis and discussion by the means of these previous examples and try to improve the simulation by taking nonlinear and temperature effects into account.…”

Section: Methodsmentioning

confidence: 99%

“…The reader will find illustrative examples and a much more comprehensive elaboration of the method elsewhere [11][12][13][14]. [28,[33][34][35][36] been given in the flow chart.…”

Section: Introduction Into the Physical Scratch And/or Tribological Tmentioning

confidence: 99%

Completely Analytical Tools for the Next Generation of Surface and Coating Optimization

Schwarzer¹

2014

Coatings

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Usually, some severe efforts are required to obtain tribological parameters like Archard's wear depth parameter k d . Complex tribological experiments have to be performed and analyzed. The paper features an approach where such parameters are extracted from effective interaction potentials in combination with more physical-oriented measurements, such as Nanoindentation and physical scratch. Thereby, the effective potentials are built up and fed from such tests. By using effective material potentials one can derive critical loading situations leading to failure (decomposition strength) for any contact situation. A subsequent connection of these decomposition or failure states with the corresponding stress or strain distributions allows the development of rather comprehensive tribological parameter models, applicable in wear and fatigue simulations, as demonstrated in this work. From this, a new relatively general wear model has been developed on the basis of the effective indenter concept by using the extended Hertzian approach for a great variety of loading situations. The models do not only allow to analyze certain tribological experiments, such as the well known pin-on disk test or the more recently developed nano-fretting test, but also to forward simulate such tests and even give hints for structured optimization or result in better component life-time prediction. The work will show how the procedure has to be applied in general and a small selection of practical examples will be presented.

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Short note on improved integration of mechanical testing in predictive wear models

Cited by 20 publications

References 34 publications

Repressing oxidative wear within Si doped DLCs

Repressing oxidative wear within Si doped DLCs

Development of DLC coating architectures for demanding functional surface applications through nano- and micro-mechanical testing

Completely Analytical Tools for the Next Generation of Surface and Coating Optimization

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