Analytical parametric analysis of the contact problem of human buttocks and negative Poisson's ratio foam cushions

Yun Che Wang, Roderic Lakes

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

Analytical investigations on the contact problems between two homogeneous and isotropic soft bodies were performed to simulate the contact of human buttocks and seat cushions. The cushion materials' Poisson's ratio were allowed to be negative. The human buttocks were modeled as an ideal sphere with radius 15 cm. and assumed to have a low Young's modulus and a Poisson's ratio close to 0.5. These parameters were held constant during our analysis. Peak contact pressure was reduced by adjusting the contour curvature of cushions according to Hertz theory, as expected. Moreover, analysis by both the Hertz model and a finite thickness 3D elasticity model showed that using negative Poisson's ratio cushions could further reduce the pressure. Negative Poisson's ratio cushions may be beneficial in the prevention of pressure sores or ulcers in the sick and in reduction of pressure-induced discomfort in seated people.

Original languageEnglish
Pages (from-to)4825-4838
Number of pages14
JournalInternational Journal of Solids and Structures
Volume39
Issue number18
DOIs
Publication statusPublished - 2002 Sep

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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