Strength of adhesive contacts: Influence of contact geometry and material gradients
Abstract The 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 p...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2017-09-01
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| Series: | Friction |
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| Online Access: | http://link.springer.com/article/10.1007/s40544-017-0177-3 |
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| _version_ | 1850145708731006976 |
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| author | Valentin L. Popov Roman Pohrt Qiang Li |
| author_facet | Valentin L. Popov Roman Pohrt Qiang Li |
| author_sort | Valentin L. Popov |
| collection | DOAJ |
| description | Abstract The 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. |
| format | Article |
| id | doaj-art-1fb26d7da3304ac0ba986c4ba9756c79 |
| institution | OA Journals |
| issn | 2223-7690 2223-7704 |
| language | English |
| publishDate | 2017-09-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Friction |
| spelling | doaj-art-1fb26d7da3304ac0ba986c4ba9756c792025-08-20T02:28:01ZengTsinghua University PressFriction2223-76902223-77042017-09-015330832510.1007/s40544-017-0177-3Strength of adhesive contacts: Influence of contact geometry and material gradientsValentin L. Popov0Roman Pohrt1Qiang Li2Institute of Mechanics, Technische Universität BerlinInstitute of Mechanics, Technische Universität BerlinInstitute of Mechanics, Technische Universität BerlinAbstract The 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.http://link.springer.com/article/10.1007/s40544-017-0177-3adhesionboundary element method (BEM)flat-ended indentersgradient media |
| spellingShingle | Valentin L. Popov Roman Pohrt Qiang Li Strength of adhesive contacts: Influence of contact geometry and material gradients Friction adhesion boundary element method (BEM) flat-ended indenters gradient media |
| title | Strength of adhesive contacts: Influence of contact geometry and material gradients |
| title_full | Strength of adhesive contacts: Influence of contact geometry and material gradients |
| title_fullStr | Strength of adhesive contacts: Influence of contact geometry and material gradients |
| title_full_unstemmed | Strength of adhesive contacts: Influence of contact geometry and material gradients |
| title_short | Strength of adhesive contacts: Influence of contact geometry and material gradients |
| title_sort | strength of adhesive contacts influence of contact geometry and material gradients |
| topic | adhesion boundary element method (BEM) flat-ended indenters gradient media |
| url | http://link.springer.com/article/10.1007/s40544-017-0177-3 |
| work_keys_str_mv | AT valentinlpopov strengthofadhesivecontactsinfluenceofcontactgeometryandmaterialgradients AT romanpohrt strengthofadhesivecontactsinfluenceofcontactgeometryandmaterialgradients AT qiangli strengthofadhesivecontactsinfluenceofcontactgeometryandmaterialgradients |