• Title/Summary/Keyword: 유기탄성체 복합재료

Search Result 4, Processing Time 0.042 seconds

Sliding Friction of Elastomer Composites in Contact with Rough Self-affine Surfaces: Theory and Application (자기-아핀 표면 특성을 고려한 유기탄성체 복합재료 마찰 이론 및 타이어 트레드/노면 마찰 응용)

  • Bumyong Yoon;Yoon Jin Chang;Baekhwan Kim;Jonghwan Suhr
    • Composites Research
    • /
    • v.36 no.3
    • /
    • pp.141-153
    • /
    • 2023
  • This review paper presents an introduction of contact mechanics and rubber friction theory for sliding friction of elastomer composites in contact with rough surfaces. Particularly, Klüppel & Heinrich theory considers the self-affine (or fractal) characteristic for rough surfaces to predict adhesion and hysteresis frictions of elastomers based on the contact mechanics of Greenwood & Williamson. Due to dynamic excitation process of elastomer composites while sliding in contact with multiscale surface roughness (or asperity), viscoelastic properties in a wide frequency range becomes major contributor to friction behaviors. A brief description and examples are provided to construct a viscoelastic master curve considering nonlinear viscoelasticity of elastomer composites. Finally, application of rubber friction theory to tire tread compounds in traction with road surfaces is discussed with several experimental and theoretical results.

Gas Permeable Properties of Elastomer-Clay Nanocomposite Membrane (유기탄성체-Clay 나노복합재료 막의 기체투과 특성)

  • Nam Sang-Yong;Park Ji-Soon;Rhim Ji-Won;Chung Youn-Suk;Lee Young-Moo
    • Membrane Journal
    • /
    • v.16 no.2
    • /
    • pp.144-152
    • /
    • 2006
  • Elastomer-clay nanocomposite membranes were prepared by melt intercalation mothod with internal mixer. We are used NMR, Ionomer, SEBS (Styrene Ethylene Butadien styrene Copolymer) as elastomer, and modified clay. Gas barrier property of the elastomer-clay nanocomposites membranes were investigated by a gas permeability of $CO_2,\;O_2,\;N_2$ at room temperature. Gas permeability through the elastomer-clay nanocomposite membranes increased due to increased tortuosity made by intercalation of clay in elastomer.

Self-healing Engineering Materials: I. Organic Materials (자기치유 공학재료: I. 유기 재료)

  • Choi, Eun-Ji;Wang, Jing;Yoon, Ji-Hwan;Shim, Sang-Eun;Yun, Ju-Ho;Kim, Il
    • Clean Technology
    • /
    • v.17 no.1
    • /
    • pp.1-12
    • /
    • 2011
  • Scientists and engineers have altered the properties of materials such as metals, alloys, polymers, ceramics, and so on, to suit the ever changing needs of our society. Man-made engineering materials generally demonstrate excellent mechanical properties, which often tar exceed those of natural materials. However, all such engineering materials lack the ability of self-healing, i.e. the ability to remove or neutralize microcracks without intentional human interaction. The damage management paradigm observed in nature can be reproduced successfully in man-made engineering materials, provided the intrinsic character of the various types of engineering materials is taken into account. Various self-healing ptotocols that can be applied for the organic materials such as polymers, ionomers and composites can be developed by utilizing suitable chemical reactions and physical intermolecular interactions.

Characterization of Thickness and Thermoelastic Properties of Interphase in Polymer Nanocomposites using Multiscale Analysis (멀티스케일 해석을 통한 고분자 나노복합재의 계면 상 두께와 열탄성 물성 도출)

  • Choi, Joonmyung;Cho, Maenghyo
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.29 no.6
    • /
    • pp.577-582
    • /
    • 2016
  • In this study, a multiscale method for solving a thermoelasticity problem for interphase in the polymeric nanocomposites is developed. Molecular dynamics simulation and finite element analysis were numerically combined to describe the geometrical boundaries and the local mechanical response of the interfacial region where the polymer networks were highly interacted with the nanoparticle surface. Also, the micrmechanical thermoelasticity equations were applied to the obtained equivalent continuum unit to compute the growth of interphase thickness according to the size of nanoparticles, as well as the thermal phase transition behavior at a wide range of temperatures. Accordingly, the equivalent continuum model obtained from the multiscale analysis provides a meaningful description of the thermoelastic behavior of interphase as well as its nanoparticle size effect on thermoelasticity at both below and above the glass transition temperature.