Measured and predicted static friction for real rough surfaces in point contact / Jose M. García in Transactions of the ASME . Journal of tribology, Vol. 134 N° 3 (Juillet 2012)  

Public ISBD [article]  inTransactions of the ASME . Journal of tribology > Vol. 134 N° 3 (Juillet 2012) . - 08 p. Titre : Measured and predicted static friction for real rough surfaces in point contact Type de document : texte imprimé Auteurs : Jose M. García, Auteur ; Ashlie Martini, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : tribology Langues : Anglais (eng) Mots-clés : static friction  metallic point contacts  rough surface  numerical model  discrete convolution fast Fourier transform Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A numerical model to predict static friction for metallic point contacts was developed and validated by comparison to experimental measurements using a specially designed test rig. Key aspects of the numerical model were the incorporation of a digitized real rough surface profile, application of discrete convolution fast Fourier transform (DC-FFT) to predict local asperity interference, and modification of the yield strength to capture the effect of cold hardening. It was found that these model features are critically important to quantitative prediction of static friction. The model significantly underestimated the static friction coefficient if randomly generated surfaces having statistical parameters the same as the measured rough surface were used; digitized real rough surfaces enabled accurate predictions. Further, the model was able to describe the static friction of worn surfaces after cold hardening was introduced through modification of material yield strength. This work illustrates the importance of incorporating the surface features and the change of those features with wear to accurately and reliably predict static friction. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000003 [...] [article] Measured and predicted static friction for real rough surfaces in point contact [texte imprimé] / Jose M. García, Auteur ; Ashlie Martini, Auteur . - 2012 . - 08 p. tribology Langues : Anglais (eng) in Transactions of the ASME . Journal of tribology > Vol. 134 N° 3 (Juillet 2012) . - 08 p. Mots-clés : static friction  metallic point contacts  rough surface  numerical model  discrete convolution fast Fourier transform Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A numerical model to predict static friction for metallic point contacts was developed and validated by comparison to experimental measurements using a specially designed test rig. Key aspects of the numerical model were the incorporation of a digitized real rough surface profile, application of discrete convolution fast Fourier transform (DC-FFT) to predict local asperity interference, and modification of the yield strength to capture the effect of cold hardening. It was found that these model features are critically important to quantitative prediction of static friction. The model significantly underestimated the static friction coefficient if randomly generated surfaces having statistical parameters the same as the measured rough surface were used; digitized real rough surfaces enabled accurate predictions. Further, the model was able to describe the static friction of worn surfaces after cold hardening was introduced through modification of material yield strength. This work illustrates the importance of incorporating the surface features and the change of those features with wear to accurately and reliably predict static friction. DEWEY : 621.5 ISSN : 0742-4787 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000003 [...]

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