| MICROMECHANICS OF ROUGH SURFACE ADHESION： A HOMOGENIZED PROJECTION METHOD |
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| 作者姓名： | Kyung-Suk Kim |
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| 作者单位： | Qunyang Li(Division of Engineering, Brown University, Providence, RI 02912, USA;Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104, USA);Kyung-Suk Kim(Division of Engineering, Brown University, Providence, RI 02912, USAchina) |
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| 基金项目： | Project supported in part by the Nano and Bio Mechanics Program,under award CMS-0511961; in part by the MRSEC Program,under award DMR-0520651,of the National Science Foundation |
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| 摘 要： | A quasistatic homogenized projection is made to characterize the effective cohesive zone behavior for rough-surface adhesion. In the context of the homogenized projection, the traction versus separation relation for the homogenized cohesive zone （HCZ） of a rough interface can be highly oscillatory due to instabilities during microscopic adhesion and decohesion processes. The instabilities are found to occur not only individually but also collectively among the adhesive micro-asperity contacts, leading to extensive energy dissipation. Based on the behaviors of the HCZ relations, a framework for describing instability-induced energy dissipation in rough-surface adhesion is proposed to elucidate the effect of roughness on apparent interface adhesion. Two non- dimensional parameters, α related to roughness morphology and n related to flaw distribution, are identified to be most crucial for controlling the energy dissipation. For an interface with a shallow roughness and a strong intrinsic adhesive strength, the interface adhesion can be stronger if we make it rougher （reducing α） or lower its flaw density （increasing n）. The HCZ projection method can be potentially extended and employed to bridge the apparent adhesion from intrinsic adhesion properties for engineering surfaces with multi-scale shallow roughness.
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| 关 键 词： | 粘附性能 粗糙表面 投影方法 均质 界面粗糙度 模型预测 细观 能源消耗 |
| 收稿时间： | 3 August 2009 |
MICROMECHANICS OF ROUGH SURFACE ADHESION:A HOMOGENIZED PROJECTION METHOD |
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| Kyung-Suk Kim.MICROMECHANICS OF ROUGH SURFACE ADHESION:A HOMOGENIZED PROJECTION METHOD[J].Acta Mechanica Solida Sinica,2009,22(5):377-390. |
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| Authors: | Qunyang Li Kyung-Suk Kim |
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| Institution: | Division of Engineering, Brown University, Providence, RI 02912, USA |
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| Abstract: | A quasistatic homogenized projection is made to characterize the effective cohesive zone behavior for rough-surface adhesion.In the context of the homogenized projection,the traction versus separation relation for the homogenized cohesive zone(HCZ)of a rough interface can be highly oscillatory due to instabilities during microscopic adhesion and decohesion processes. The instabilities are found to occur not only individually but also collectively among the adhesive micro-asperity contacts,leading to extensi... |
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| Keywords: | homogenized cohesive zone interface adhesion roughness effect instability energy dissipation |
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