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The Effects of Poisson's Ratio on the Indentation Behaviour of Materials with Embedded System in an Elastic Matrix

Li, S and Al-Badani, K and Gu, Y and Lake, MJ and Li, B and Rothwell, G and Ren, X (2017) The Effects of Poisson's Ratio on the Indentation Behaviour of Materials with Embedded System in an Elastic Matrix. physica status solidi (b). ISSN 0370-1972

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Abstract

Soft materials with an embedded stiffer layer are increasingly used in medical and sports engineering. A detailed understanding of the mechanical behaviour of such a material system under localised load and resistance to indentation is very important. In this work, the deformation of an isotropic soft matrix with a buried stiffer thin layer under a circular flat indenter was investigated through finite element (FE) modelling. A practical approach in simulating the indentation resistance of such a system (soft matrix with a buried thin stiffer layer) is evaluated. The numerical result is correlated with the data based on analytical approaches for both homogenous materials and elastic half space with an embedded stiffer layer. The influence of Poisson’s ratio and auxeticity of the matrix on the deformation and indentation stiffness of the material system under different conditions (indenter size, sheet thickness and embedment depth) were established and main influences of the Poisson’s ratio on the material deformation and stresses are discussed. The result shows that the influence of matrix auxeticity on indentation resistance is highly depth dependent, with over 30% enhancement of the indentation resistance being predicted for materials with matrix of a negative Poisson’s ratio.

Item Type: Article
Additional Information: This is the accepted version of the following article: Li, S., Al-Badani, K., Gu, Y., Lake, M., Li, L., Rothwell, G. and Ren, J. (2017), The Effects of Poisson's Ratio on the Indentation Behavior of Materials With Embedded System in an Elastic Matrix. Phys. Status Solidi B, 1600832. doi:10.1002/pssb.201600832, which has been published in final form at http://dx.doi.org/10.1002/pssb.201600832
Uncontrolled Keywords: 0204 Condensed Matter Physics, 0206 Quantum Physics, 1007 Nanotechnology
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
T Technology > TJ Mechanical engineering and machinery
Divisions: Maritime and Mechanical Engineering
Sport & Exercise Sciences
Publisher: Wiley
Date Deposited: 28 Nov 2017 10:10
Last Modified: 28 Nov 2017 10:12
DOI or Identification number: 10.1002/pssb.201600832
URI: http://researchonline.ljmu.ac.uk/id/eprint/7606

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