Jump to ContentJump to Main Navigation
Show Summary Details
More options …

International Journal of Applied Mechanics and Engineering

The Journal of University of Zielona Góra

Editor-in-Chief: Walicki, Edward

4 Issues per year

CiteScore 2016: 0.12

SCImago Journal Rank (SJR) 2016: 0.127
Source Normalized Impact per Paper (SNIP) 2016: 0.063

Open Access
See all formats and pricing
More options …

Comparison of Contact Stress Distribution for Foam Seat and Seat of Auxetic Spring Skeleton

M. Janus-Michalska
  • Corresponding author
  • Institute of Structural Mechanics Cracow University of Technology ul. Warszawska 24, 31-155 Kraków, POLAND
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ D. Jasińska / J. Smardzewski
  • Corresponding author
  • Department of Furniture Design Poznań University of Life Science ul. Wojska Polskiego 28, 60-637 Poznań, POLAND
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2013-04-19 | DOI: https://doi.org/10.2478/ijame-2013-0004

The objective of this paper is to present and compare the results of numerical solutions of contact problem for two types of seats subjected to typical sitting loadings. The first seat is made of a typical hyperelastic foam, the other is designed with an auxetic polyamid spring skeleton. Computer simulations of the seat structure under a typical static loading exerted by a human body are performed by means of ABAQUS FEA. The model provides an insight into deformation modes and stress field in relation to geometric and material parameters of the seat structure.The other type of seat, due to the fact of global auxecity and progressive springs characteristics reduces contact stress concentrations, giving an advantegous distribution of pressure and provides the sensation of physical comfort. The proper seat skeleton shape leads to an improvement of ergonomic quality.

Keywords : auxetic structures; seat; utility load; contact problem

  • Cassar T. and Gross C.M. (1995): Evaluation of an intelligent seat system. - Applied Ergonomics, vol.26, pp.109-116.Google Scholar

  • Ebe K. and Griffin M.J. (2001): Factors effecting static and seat cushion comfort. - Ergonomics, vol.41, No.10, pp.901-992.Google Scholar

  • Ebe K. (1998): Predicting overall seat discomfort from static and dynamic characteristics of seats. - PhD thesis, Institute of Sound and Vibration Research, Faculty of Engineering and Applied Science, University of Southampton, UK.Google Scholar

  • Janus-Michalska M. (2009): Micromechanical model of auxetic cellular materials. - Journal of Theoretical and Applied Mechanics (JTAM), 4, vol.47 pp.737-750.Google Scholar

  • Janus-Michalska M. and Jasinska D. (2010): Contact problem for a class of anisotropic elastic cellular bodies withnonpositive Poisson’s ratio. - Technical Transactions, 4-B/2010/issue 19, year 107.Google Scholar

  • Jasińska D. and Janus-Michalska M. (2008): Material design of anisotropic elastic cellular bodies with respect tocontact problem - Engineering Transactions, vol.56, No.3, pp.201-225.Google Scholar

  • Jasińska D., Janus-Michalska M. and Smardzewski J. (2012): A study on the design of auxetic structure of seat skeleton. - In Review for Mechanics and Control.Google Scholar

  • Johnson K.L. (1985): Contact Mechanics. - Cambridge, London: Cambridge University Press.Google Scholar

  • Keer L.M. (1964): The contact stress problem for an elastic sphere indenting an elastic layer. - Journal of Applied Mechanics, pp.143-145.Google Scholar

  • Kikuchi N. and Oden J.T. (1988): Contact Problems in Elasticity: A study of Variational Ineqalitiees and FiniteElement Methods. - SIAM Philadelphia.Google Scholar

  • Lowe A. and Lakes R.S. (2000): Negative Poisson’s ratio foam as seat cushion material. - Cellular Polym., vol.19, No.3, pp.157-167.Google Scholar

  • Moes C. (1989): The development of a pressure distribution measuring device for various person-product contactareas. - Proceedings of the Ergonomics Society’s 1989 Annual Conference”, Contemporary Ergonomics, pp.349-354, Reading, UK.Google Scholar

  • Moes C. (1999): Proceeding of the ISATA Automotive Mechatronics Computer Support for Pressure DistributionControlled Shape Design Design & Engineering, Vienna, pp.483-492.Google Scholar

  • Park S.J. and Kim C.B. (1997): The evaluation of seating comfort by objective measures. - SAE Conference.Google Scholar

  • Park S.J. and Lee Y.S., Nahm Y.E., Lee J.W., Kim J.S. (1998): Seating physical characteristics and subjective comfort:design considerations, SAE Conference, SAE no 980653.Google Scholar

  • Sakamoto M., Li G., Hara T. and Chao Y.S. (1996): A new method for theoretical analysis of static indentation test. - J. Biomech., vol.29, No.5, pp.679-685.Google Scholar

  • Staarink H. (1995): Sitting Posture, Comfort and Pressure. - PhD Thesis, Delft University of Technology, Delft, the Netherlands.Google Scholar

  • Swearingen J.J., Wheelwright C.D. and Garner J.D. (1962): An analysis of sitting areas and pressure of man (Report 62-1), Oklahoma City, OK: Civil Aero Medical Research Institute.Google Scholar

  • Verver M.M., van Hoof J., Oomens C.W.J., Wismans J. and Baaijens F.P.T. (2004): A finite element model of thehuman buttocks for prediction of seat pressure distributions. - Computer Methods In Biomechanics and Biomedical Engineering, vol.7, No.4, pp.193-203.CrossrefGoogle Scholar

  • Wang Y. and Lakes R. (2002): Analytical parametric analysis of the contact problem of human buttocks and negativePoisson’s ratio foam cushions. - International Journal of Solids and Structures, vol.39, pp.4825-838.Google Scholar

  • Zhao L.Q., Xia Q.S. and Wu X.T. (1994): Study of sitting comfort of automotive seats. - SAE Conference 1994, SAE No 945243.Google Scholar

About the article

Published Online: 2013-04-19

Published in Print: 2013-03-01

Citation Information: International Journal of Applied Mechanics and Engineering, Volume 18, Issue 1, Pages 55–72, ISSN (Print) 1734-4492, DOI: https://doi.org/10.2478/ijame-2013-0004.

Export Citation

This content is open access.

Comments (0)

Please log in or register to comment.
Log in