A contact mechanics method for characterizing the elastic properties and permeability of gels

Chung Yuen Hui, Yu-Yun Lin, F. U.Chin Chuang, Kenneth R. Shull, Wei Chun Lin

研究成果: Article

36 引文 (Scopus)

摘要

When a saturated gel immersed in the same liquid is suddenly brought into contact with a smooth rigid indenter, the liquid cannot immediately flow out of the pores, and so the gel initially behaves as an incompressible material. This gives rise to a pressure gradient in the liquid phase and the liquid flows until the pressure in it goes to zero everywhere, and all the stresses are transferred to the elastic network. As a result of the flow, the force needed to maintain a constant contact area relaxes with time. In this work, we study the feasibility of using an indentation test to measure this time-dependent force and to determine the elastic modulus, the Poisson's ratio, and the permeability, D p, of the network. Specifically, we consider a two-dimensional Hertz contact problem of a rigid circular cylinder indenting on a half space consisting of an elastic gel. The network of the gel is assumed to be linearly elastic and isotropic, and liquid flow within the gel is assumed to obey Darcy's law, which states that the flux is proportional to the pressure gradient. Exact expressions are obtained for the initial and final force required to maintain a given contact length. These expressions allow us to determine the elastic constants of the network. The permeability of the network can be obtained from the time-dependent relaxation of the load, which is obtained by solving the exact continuum equations.

原文English
頁(從 - 到)359-370
頁數12
期刊Journal of Polymer Science, Part B: Polymer Physics
44
發行號2
DOIs
出版狀態Published - 2006 一月 15

指紋

permeability
Mechanics
Gels
elastic properties
gels
Liquids
liquid flow
Pressure gradient
pressure gradients
Poisson ratio
Elastic constants
circular cylinders
Circular cylinders
liquids
half spaces
indentation
Indentation
Contacts (fluid mechanics)
modulus of elasticity
liquid phases

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

引用此文

Hui, Chung Yuen ; Lin, Yu-Yun ; Chuang, F. U.Chin ; Shull, Kenneth R. ; Lin, Wei Chun. / A contact mechanics method for characterizing the elastic properties and permeability of gels. 於: Journal of Polymer Science, Part B: Polymer Physics. 2006 ; 卷 44, 編號 2. 頁 359-370.
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A contact mechanics method for characterizing the elastic properties and permeability of gels. / Hui, Chung Yuen; Lin, Yu-Yun; Chuang, F. U.Chin; Shull, Kenneth R.; Lin, Wei Chun.

於: Journal of Polymer Science, Part B: Polymer Physics, 卷 44, 編號 2, 15.01.2006, p. 359-370.

研究成果: Article

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