iMechanica - Archard wear
https://imechanica.org/taxonomy/term/1965
enTHE "SPORT" OF ROUGH CONTACTS AND THE FRACTAL PARADOX IN WEAR LAWS
https://imechanica.org/node/22128
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/1965">Archard wear</a></div><div class="field-item odd"><a href="/taxonomy/term/11743">adhesion; contact mechanics; rough contact</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>DOI10.22190/FUME180109011C</p>
<p><span>Prof. Michele Ciavarella, Dr. Antonio Papangelo</span></p>
<p> <strong>Abstract:</strong><span> </span>In a recent paper in Science, namely, "The Contact Sport of Rough Surfaces", Carpick summarizes recent efforts in a "contact challenge" to predict in detail an elastic contact between the mathematically defined fractal rough surfaces under (very little) adhesion. He also suggests the next steps that are needed to "fulfill da Vinci's dream of understanding what causes friction". However, this is disappointing as friction has been studied since the times of Leonardo and in 500 years, no predictive model has emerged, nor any significant improvement from rough contact models. Similarly, a very large effort we have spent on the "sport" of studying rough surfaces has not made us any closer to being able to predict the coefficient of proportionality between wear loss and friction dissipation which was already observed by Reye in 1860. Recent nice simulations by Aghababaei, Warner and Molinari have confirmed the criterion for the formation of debris of a single particle, proposed in 1958 by Rabinowicz, as well as Reye's assumption for the proportionality with frictional loss, which is very close to Archard anyway. More recent investigations under variable loads suggest that Reye's assumption is probably much more general than Archard's law. The attempts to obtain exact coefficients with rough surfaces models are very far from predictive, essentially because for fractals most authors fail to recognize that resolution-dependence of the contact area makes the models very ill-defined. We also suggest that in the models of wear, rough contacts should be considered "plastic" and "adhesive" and introduce a new length scale in the problem.</p>
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<p><span><a href="https://www.researchgate.net/profile/Antonio_Papangelo"><span lang="EN-GB" xml:lang="EN-GB">ResearchGate</span></a></span><span lang="EN-GB" xml:lang="EN-GB">, </span><span><a href="https://scholar.google.it/citations?user=kUaZTJYAAAAJ&hl=it"><span lang="EN-GB" xml:lang="EN-GB">Google Scholar</span></a></span><span lang="EN-GB" xml:lang="EN-GB">, </span><span><a href="https://www.scopus.com/authid/detail.uri?origin=resultslist&authorId=56426970600&zone="><span lang="EN-GB" xml:lang="EN-GB">Scopus</span></a></span><span lang="EN-GB" xml:lang="EN-GB">, </span><span><a href="mailto:antonio.papangelo@poliba.it"><span lang="EN-GB" xml:lang="EN-GB">antonio.papangelo@poliba.it</span></a></span></p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Ciavarella%20Papangelo%202018%20-%20The%20sport%20of%20ropugh%20contacts%20and%20the%20fractal%20paradox%20in%20wear%20laws.pdf" type="application/pdf; length=242260">Ciavarella Papangelo 2018 - The sport of ropugh contacts and the fractal paradox in wear laws.pdf</a></span></td><td>236.58 KB</td> </tr>
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</div></div></div>Fri, 09 Feb 2018 14:17:04 +0000Antonio Papangelo22128 at https://imechanica.orghttps://imechanica.org/node/22128#commentshttps://imechanica.org/crss/node/22128Multi time scale simulations for wear prediction in micro-gears
https://imechanica.org/node/6879
<div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/248">finite element analysis</a></div><div class="field-item odd"><a href="/taxonomy/term/1963">Wear modeling</a></div><div class="field-item even"><a href="/taxonomy/term/1964">Wear simulation</a></div><div class="field-item odd"><a href="/taxonomy/term/1965">Archard wear</a></div><div class="field-item even"><a href="/taxonomy/term/4427">C/C++ codes to solve wear equation</a></div></div></div><div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Reliability of micro-gears is known to be adversely affected by wear. In this work we report a strategy to predict local wear with the aim of predicting their effective life span. For the prediction of local wear we start from the relevant model experiments, choice of a suitable wear model and identification of the wear coefficient from these experiments. This wear model is then implemented in an efficient finite element based scheme to predict local wear. Here we report the further development of this finite element based wear simulation tool, the Wear-Processor, to handle this multi time scale problem of gear tooth wear. It is needed to bridge the various time scales between the very fast pass of a contact over a surface point and the long-term wear simulation that is required for a prediction of the life span. Additionally it is necessary to account for any change in the slip rate due to wear. The results presented in this article show how fast the gear tooth geometry, the slip rates and the line of action deviate from their original values as a consequence of wear. We predict a maximum of 3 µm of wear on silicon nitride micro gear tooth flank with width of 200 µm just after 3500 contact cycles.</p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Hegadekatte2009-PrePrint.pdf" type="application/pdf; length=2207456" title="Hegadekatte2009-PrePrint.pdf">Hegadekatte2009-PrePrint.pdf</a></span></td><td>2.11 MB</td> </tr>
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</div></div></div>Sun, 04 Oct 2009 14:40:24 +0000vh6879 at https://imechanica.orghttps://imechanica.org/node/6879#commentshttps://imechanica.org/crss/node/6879Predictive modeling schemes for wear in tribometers
https://imechanica.org/node/2784
<div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Study of wear in complex micro-mechanical components is often accomplished experimentally using a pin-<br />
on-disc and twin-disc tribometer. The present paper proposes an approach that involves a computationally <br />
efficient incremental implementation of Archard’s wear model on the global scale for modeling sliding and <br />
slipping wear in such experiments. It will be shown that this fast simplistic numerical tool can be used to <br />
identify the wear coefficient from pin-on-disc experimental data and also predict the wear depths within a <br />
limited range of parameter variation. Further it will also be used to study the effect of introducing friction <br />
coefficient into the wear model and also to model water lubricated experiments. A similar tool is presented<br />
to model wear due to a defined slip in a twin-disc tribometer. The resulting wear depths from this tool is <br />
verified using experimental data and two different finite element based numerical tools namely, the Wear-<br />
Processor, which is a FE post processor, and a user-defined subroutine UMESHMOTION in the <br />
commercial FE package ABAQUS. It will be shown that the latter two tools have the potential for use in <br />
predicting wear and the effective life span of any general tribosystem using the identified wear coefficient <br />
from relevant tribometry data.</p>
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<tr class="odd"><td><span class="file"><img class="file-icon" alt="PDF icon" title="application/pdf" src="/modules/file/icons/application-pdf.png" /> <a href="https://imechanica.org/files/Hegadekatte-et-al._2008_Manuscript_Tribology-International.pdf" type="application/pdf; length=1264637" title="Hegadekatte-et-al._2008_Manuscript_Tribology-International.pdf">Hegadekatte-et-al._2008_Manuscript_Tribology-International.pdf</a></span></td><td>1.21 MB</td> </tr>
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</div></div></div><div class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above"><div class="field-label">Forums: </div><div class="field-items"><div class="field-item even"><a href="/forum/596">Contact Mechanics Forum</a></div></div></div><div class="field field-name-taxonomy-vocabulary-6 field-type-taxonomy-term-reference field-label-hidden"><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/76">research</a></div></div></div><div class="field field-name-taxonomy-vocabulary-8 field-type-taxonomy-term-reference field-label-above"><div class="field-label">Free Tags: </div><div class="field-items"><div class="field-item even"><a href="/taxonomy/term/356">friction</a></div><div class="field-item odd"><a href="/taxonomy/term/641">finite element</a></div><div class="field-item even"><a href="/taxonomy/term/706">contact mechanics</a></div><div class="field-item odd"><a href="/taxonomy/term/1963">Wear modeling</a></div><div class="field-item even"><a href="/taxonomy/term/1964">Wear simulation</a></div><div class="field-item odd"><a href="/taxonomy/term/1965">Archard wear</a></div></div></div>Sat, 01 Mar 2008 01:07:56 +0000vh2784 at https://imechanica.orghttps://imechanica.org/node/2784#commentshttps://imechanica.org/crss/node/2784Error | iMechanica