A STUDY ON THE DESIGN OF AUXETIC STRUCTURE OF SEAT SKELETON

This paper presents numerical study of deformation and stresses in seat skeleton elements subject to static and dynamic pressure loads. Elastic skeleton made of polyamide or elastomer is taken as an example of a seat material. Auxetic type of seat structure ensures the reduction of real contact stresses between human body and seat, making it more comfortable than typical. FEM analysis is performed using ABAQUS system. Numerical calculations are carried out to determine the nonlinear stiffness characteristics of seat springs. The study makes possible the selection of material and structural topology fulfilling design constraints and additional recommendations concerning structural flexibility, stability and optimal reduction of contact stresses. This paper presents an application of the problem.

[1]  Georgios E. Stavroulakis,et al.  Auxetic behaviour: appearance and engineering applications , 2005 .

[2]  D. Jasińska,et al.  Material design of anisotropic elastic cellular bodies with respect to contact problem , 2008 .

[3]  Roderic S. Lakes,et al.  Design Considerations for Materials with Negative Poisson’s Ratios , 1993 .

[4]  A. Scalia,et al.  Contact Problem for Porous Elastic Half-Plane , 2000 .

[5]  G. Szefer,et al.  Contact of Elastic Bodies with Negative Poisson’s Ratio , 2003 .

[6]  Małgorzata Janus-Michalska,et al.  Micromechanical model of auxetic cellular materials , 2009 .

[7]  R. Lakes.  Foam Structures with a Negative Poisson's Ratio , 1987, Science.

[8]  J van Hoof,et al.  A Finite Element Model of the Human Buttocks for Prediction of Seat Pressure Distributions , 2004, Computer methods in biomechanics and biomedical engineering.

[9]  Roderic S. Lakes,et al.  Analytical parametric analysis of the contact problem of human buttocks and negative Poisson's ratio foam cushions , 2002 .

[10]  Se Jin Park,et al.  The Evaluation of Seating Comfort by the Objective Measures , 1997 .

[11]  L Q Zhao,et al.  STUDY OF SITTING COMFORT OF AUTOMOTIVE SEATS , 1994 .

[12]  I. Horváth,et al.  Using Finite Elements Model of the Human Body for Shape Optimization of Seats: Optimization Material Properties , 2002 .

[13]  Young-Shin Lee,et al.  SEATING PHYSICAL CHARACTERISTICS AND SUBJECTIVE COMFORT: DESIGN CONSIDERATIONS , 1998 .

[14]  Eiichi Yasuda,et al.  Evaluation of riding comfort: From the viewpoint of interaction of human body and seat for static, dynamic, long time driving , 2000 .