Liu, Xiaoming

Song, Hengxu

Vakis, Antonis I.

van der Giessen, Erik

English

It is well known that rough surfaces have asperities at a wide range of length scales; that contacting asperities may yield even under low loads; and that plasticity in crystalline metals is size dependent at length scales below tens of micrometers. The influence of size dependent plasticity on the contact and frictional properties, however, is still quite an open question.Here we present a statistical description of rough surface contact that incorporates size dependent plasticity through a simple strain gradient plasticity theory. The intrinsic material length scale in the theory is obtained by fitting to two-dimensional discrete dislocation plasticity simulations of the flattening of a single asperity. The statistical model is an extension of the Greenwood-Williamson theory incorporating the interaction between asperities. The effectiveness of the statistical model is addressed by comparison with full-detail finite element simulations of rough surface contact using strain gradient plasticity. One of the most noteworthy results of the analysis is that contact force and total contact area remain linear, as for elastic materials, but with a proportionality factor that depends on the ratio of the rms roughness and the material length scale

ARTS repository - University of Groningen

   University of GroningenFrom Discrete Dislocation Plasticity to a Statistical Model of Rough Surface ContactSong, Hengxu; Vakis, Antonis I.; Liu, Xiaoming; van der Giessen, ErikIMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite fromit. Please check the document version below.Publication date:2017Link to publication in University of Groningen/UMCG research databaseCitation for published version (APA):Song, H., Vakis, A. I., Liu, X., & van der Giessen, E. (2017). From Discrete Dislocation Plasticity to aStatistical Model of Rough Surface Contact. Abstract from 2017 MRS Fall Meeting & Exhibit, Boston,United States.CopyrightOther than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of theauthor(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).The publication may also be distributed here under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license.More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverne-amendment.Take-down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediatelyand investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons thenumber of authors shown on this cover page is limited to 10 maximum.Download date: 13-02-2023CONTROL ID:  2794541CONTACT (NAME ONLY):  Erik Van der GiessenAbstract Details  PRESENTATION TYPE:  Oral Presentation PreferredCURRENT SYMPOSIUM:  TC06: Mechanical Behavior at the Micro and Nanoscale—Bridging Between ComputerSimulations and ExperimentsKEYWORDS:  Properties/Mechanical/tribology, Properties/Mechanical/hardness. Abstract  TITLE:  From Discrete Dislocation Plasticity to a Statistical Model of Rough Surface ContactAUTHORS (FIRST NAME, LAST NAME): Hengxu  Song2, Antonis  Vakis1, Xiaoming  Liu3, Erik  Van der Giessen1INSTITUTIONS (ALL):  1. Univ of Groningen, Groningen, Netherlands. 2. Johns Hopkins University, Baltimore, MD, United States. 3. Chinese Academy of Sciences, Beijing, China.ABSTRACT BODY: Abstract Body:  It is well known that rough surfaces have asperities at a wide range of length scales; that contactingasperities may yield even under low loads; and that plasticity in crystalline metals is size dependent at length scalesbelow tens of micrometers. The influence of size dependent plasticity on the contact and frictional properties,however, is still quite an open question. Here we present a statistical description of rough surface contact that incorporates size dependent plasticity through asimple strain gradient plasticity theory. The intrinsic material length scale in the theory is obtained by fitting to two-dimensional discrete dislocation plasticity simulations of the flattening of a single asperity. The statistical model is anextension of the Greenwood-Williamson theory incorporating the interaction between asperities. The effectiveness ofthe statistical model is addressed by comparison with full-detail finite element simulations of rough surface contactusing strain gradient plasticity. One of the most noteworthy results of the analysis is that contact force and totalcontact area remain linear, as for elastic materials, but with a proportionality factor that depends on the ratio of the rmsroughness and the material length scale.

From Discrete Dislocation Plasticity to a Statistical Model of Rough Surface Contact

https://pure.rug.nl/ws/files/54598146/submitted_abstract.pdf

From Discrete Dislocation Plasticity to a Statistical Model of Rough Surface Contact

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