Strength of adhesive contacts: Influence of contact geometry and material gradients

dc.contributor.authorPopov, Valentin L.
dc.contributor.authorPohrt, Roman
dc.contributor.authorLi, Qiang
dc.date.accessioned2020-06-09T15:01:02Z
dc.date.available2020-06-09T15:01:02Z
dc.date.issued2017-09-06
dc.description.abstractThe strength of an adhesive contact between two bodies can strongly depend on the macroscopic and microscopic shape of the surfaces. In the past, the influence of roughness has been investigated thoroughly. However, even in the presence of perfectly smooth surfaces, geometry can come into play in form of the macroscopic shape of the contacting region. Here we present numerical and experimental results for contacts of rigid punches with flat but oddly shaped face contacting a soft, adhesive counterpart. When it is carefully pulled off, we find that in contrast to circular shapes, detachment occurs not instantaneously but detachment fronts start at pointed corners and travel inwards, until the final configuration is reached which for macroscopically isotropic shapes is almost circular. For elongated indenters, the final shape resembles the original one with rounded corners. We describe the influence of the shape of the stamp both experimentally and numerically. Numerical simulations are performed using a new formulation of the boundary element method for simulation of adhesive contacts suggested by Pohrt and Popov. It is based on a local, mesh dependent detachment criterion which is derived from the Griffith principle of balance of released elastic energy and the work of adhesion. The validation of the suggested method is made both by comparison with known analytical solutions and with experiments. The method is applied for simulating the detachment of flat-ended indenters with square, triangle or rectangular shape of cross-section as well as shapes with various kinds of faults and to “brushes”. The method is extended for describing power-law gradient media.en
dc.identifier.eissn2223-7704
dc.identifier.issn2223-7690
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11286
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10174
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc600 Technik, Technologiede
dc.subject.otheradhesionen
dc.subject.otherboundary element methoden
dc.subject.otherBEMen
dc.subject.otherflat-ended indentersen
dc.subject.othergradient mediaen
dc.titleStrength of adhesive contacts: Influence of contact geometry and material gradientsen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.doi10.1007/s40544-017-0177-3
dcterms.bibliographicCitation.issue3
dcterms.bibliographicCitation.journaltitleFrictionen
dcterms.bibliographicCitation.originalpublishernameSpringerOpenen
dcterms.bibliographicCitation.originalpublisherplaceBerlin, Heidelbergen
dcterms.bibliographicCitation.pageend325
dcterms.bibliographicCitation.pagestart308
dcterms.bibliographicCitation.volume5
tub.accessrights.dnbfree
tub.affiliationFak. 5 Verkehrs- und Maschinensysteme>Inst. Mechanik>FG Systemdynamik und Reibungsphysikde
tub.affiliation.facultyFak. 5 Verkehrs- und Maschinensystemede
tub.affiliation.groupFG Systemdynamik und Reibungsphysikde
tub.affiliation.instituteInst. Mechanikde
tub.publisher.universityorinstitutionTechnische Universität Berlinde
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