Comparison of Contact Stress Distribution for Foam Seat and Seat of Auxetic Spring Skeleton
More details
Hide details
Institute of Structural Mechanics Cracow University of Technology ul. Warszawska 24, 31-155 Kraków, POLAND
Department of Furniture Design Poznań University of Life Science ul. Wojska Polskiego 28, 60-637 Poznań, POLAND
Online publication date: 2013-04-19
Publication date: 2013-03-01
International Journal of Applied Mechanics and Engineering 2013;18(1):55-72
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.
Cassar T. and Gross C.M. (1995): Evaluation of an intelligent seat system. - Applied Ergonomics, vol.26, pp.109-116.
Ebe K. and Griffin M.J. (2001): Factors effecting static and seat cushion comfort. - Ergonomics, vol.41, No.10, pp.901-992.
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.
Janus-Michalska M. (2009): Micromechanical model of auxetic cellular materials. - Journal of Theoretical and Applied Mechanics (JTAM), 4, vol.47 pp.737-750.
Janus-Michalska M. and Jasinska D. (2010): Contact problem for a class of anisotropic elastic cellular bodies with nonpositive Poisson’s ratio. - Technical Transactions, 4-B/2010/issue 19, year 107.
Jasińska D. and Janus-Michalska M. (2008): Material design of anisotropic elastic cellular bodies with respect to contact problem - Engineering Transactions, vol.56, No.3, pp.201-225.
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.
Johnson K.L. (1985): Contact Mechanics. - Cambridge, London: Cambridge University Press.
Keer L.M. (1964): The contact stress problem for an elastic sphere indenting an elastic layer. - Journal of Applied Mechanics, pp.143-145.
Kikuchi N. and Oden J.T. (1988): Contact Problems in Elasticity: A study of Variational Ineqalitiees and Finite Element Methods. - SIAM Philadelphia.
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.
Moes C. (1989): The development of a pressure distribution measuring device for various person-product contact areas. - Proceedings of the Ergonomics Society’s 1989 Annual Conference”, Contemporary Ergonomics, pp.349-354, Reading, UK.
Moes C. (1999): Proceeding of the ISATA Automotive Mechatronics Computer Support for Pressure Distribution Controlled Shape Design Design & Engineering, Vienna, pp.483-492.
Park S.J. and Kim C.B. (1997): The evaluation of seating comfort by objective measures. - SAE Conference.
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.
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.
Staarink H. (1995): Sitting Posture, Comfort and Pressure. - PhD Thesis, Delft University of Technology, Delft, the Netherlands.
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.
Verver M.M., van Hoof J., Oomens C.W.J., Wismans J. and Baaijens F.P.T. (2004): A finite element model of the human buttocks for prediction of seat pressure distributions. - Computer Methods In Biomechanics and Biomedical Engineering, vol.7, No.4, pp.193-203.
Wang Y. and Lakes R. (2002): Analytical parametric analysis of the contact problem of human buttocks and negative Poisson’s ratio foam cushions. - International Journal of Solids and Structures, vol.39, pp.4825-838.
Zhao L.Q., Xia Q.S. and Wu X.T. (1994): Study of sitting comfort of automotive seats. - SAE Conference 1994, SAE No 945243.
Journals System - logo
Scroll to top