Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Material Nonlinear Behavior and Microstructural Transition of Porous Polyurethane Foam under Uniaxial Compressive Loads

일축 압축하중 하 다공성 폴리우레탄폼의 재료비선형 거동 및 미세구조 변화

  • Lee, Eun Sun (Biomedical Research Institute, Pusan National University Hospital) ;
  • Goh, Tae Sik (Department of Orthopaedic Surgery and Biomedical Research Institute, Pusan National University Hospital) ;
  • Lee, Chi-Seung (Biomedical Research Institute, Pusan National University Hospital)
  • 이은선 (부산대학교병원 의생명연구원) ;
  • 고태식 (부산대학교병원 정형외과) ;
  • 이치승 (부산대학교병원 의생명연구원)
  • Received : 2017.08.03
  • Accepted : 2017.11.06
  • Published : 2017.12.27
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Abstract

Porous materials such as polymeric foam are widely adopted in engineering and biomedical fields. Porous materials often exhibit complex nonlinear behaviors and are sensitive to material and environmental factors including cell size and shape, amount of porosity, and temperature, which are influenced by the type of base materials, reinforcements, method of fabrication, etc. Hence, the material characteristics of porous materials such as compressive stress-strain behavior and void volume fraction according to aforementioned factors should be precisely identified. In this study, unconfined uniaxial compressive test for two types of closed-cell structure polyurethane foam, namely, 0.16 and $0.32g/cm^3$ of densities were carried out. In addition, the void volume fraction of three different domains, namely, center, surface and buckling regions under various compressive strains (10 %, 30 %, 50 % and 70 %) were quantitatively observed using Micro 3D Computed Tomography(micro-CT) scanning system. Based on the experimental results, the relationship between compressive strain and void volume fraction with respect to cell size, density and boundary condition were investigated.

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References

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