• Title, Summary, Keyword: commercial rubber

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A Study on the Convergency of the Finite Element Analysis of Rubber Using Numerical Differentiation Mehthod (수치미분을 이용한 고무의 유한요소 해석시 수렴성 연구)

  • 권영두;노권택;이창섭;홍상표
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.141-153
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    • 1999
  • A finite element procedure for the analysis of rubber-like hyperelastic material is developed. The volumetric incompressiblity conditions of the rubber deformation is included in the formulation by using penalty method. In this paper, the behavior of the rubber deformation is represented by hyperelastic constitutive relations based on a generalized Mooney-Rivlin model. The principle of virtual work is used to derive nonlinear finite element equation for the large displacement problem and presented in total-Lagrangian description. The finite element procedure using analytic differentiation resulted in very close solution to the result of the well known commercial packages NISAII AND ABAQUS. Numerical tests show that the results from the numerical differentiation method coincide very well with those from the analytic method and the well known commercial packages in static analysis. The convergency of rubber usingν iteration method is also discussed.

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Finite Element Analysis of Metal Bonded Rubber Spring (금속-고무 스프링의 유한요소 해석)

  • 우창수;김완두
    • Proceedings of the KSR Conference
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    • pp.474-481
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    • 1998
  • Metal bonded rubber spring is used in primary suspension component of the high speed train. The aim of this study is to establish a finite element analysis technique for the metal bonded rubber spring. Some theoretical analyses were performed on the hyperelastic behavior in rubber material and test are carried out to acquire the constants in strain energy function for it. Also, finite element analysis were executed to evaluate the design parameter and behavior of deformation and stress distribution using by the commercial finite element code.

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A study on the physical properties and application in rubber compounds which is used the ash of holed briquette coal as fillers (연탄재를 충전제(充塡劑)로한 고무배합(配合)에 있어서의 특성변화(特性變化) 및 그 응용(應用)에 관한 연구(硏究))

  • Kim, Byeong-Goog;Kim, Jong-Soong
    • Elastomers and Composites
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    • v.18 no.1
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    • pp.8-12
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    • 1983
  • The purpose of this study is to apply in various fields of products economically and practically using the characteristic of ash of holed briquette coal in maximum. According to the test results, the cure rate of ash of holed briquette coal is comparatively late. But it has shown nearly same level of physical properities compared with other fillers except hard clay and grey carbon.

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Prediction of Fatigue Life of 3D Jang-gu Rubber Specimens (3차원 장구형 고무시편의 피로수명예측)

  • Han, S.W.;Kim, J.Y.;Kim, W.D.;Kim, C.H.
    • Proceedings of the KSME Conference
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    • pp.710-715
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    • 2001
  • Rubber is used extensively in many industries because of its large reversible elastic deformation, excellent damping and energy absorption characteristics, and wide availability. It becomes very important to predict the fatigue life of rubber components. But a great deal of time and cost are necessary for the fatigue test of rubber components. In this study the fatigue life of rubber components is evaluated by performing the fatigue test of a specimen and FE analysis. The fatigue life of Jang-gu type specimen which is considered as a simple rubber component is predicted and compared with experimental results. Its material is natural rubber of which hardness is 60 and used for the engine mount of commercial vehicles.

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Finite Element Modeling of Rubber Pad Forming Process (고무 패드 성형 공정의 유한요소 모델링)

  • 신수정;이태수;오수익
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.9
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    • pp.117-126
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    • 1998
  • For investigating rubber pad sheet metal forming process, the rubber pad deformation characteristics as well as the contact problem of rubber pad-sheet metal has been analyzed. In this paper, the behavior of the rubber deformation is represented by hyper-elastic constitutive relations based on a generalized Mooney-Rivlin model. Finite element procedures for the two-dimensional responses, employing total Lagrangian formulations are implemented in an implicit form. The volumetric incompressibility condition of the rubber deformation is included in the formulation by using penalty method. The sheet metal is characterized by elasto-plastic material with strain hardening effect and analyzed by a commercial code. The contact procedure and interface program between rubber pad and sheet metal are implemented. Inflation experiment of circular rubber pad identifies the behaviour of the rubber pad deformation during the process. The various form dies and scaled down apparatus of the rubber-pad forming process are fabricated for simulating realistic forming process. The obtaining experimental data and FEM solutions were compared. The numerical solutions illustrate fair agreement with experimental results. The forming pressure distribution according to the dimensions of sheet metal and rubber pads, various rubber models and rubber material are also compared and discussed.

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Effects of Carbon Black Morphology and Loading Level on the Physical Properties of Natural Rubber Compound (카본블랙의 형태 특성이 천연고무 배합 물성에 미치는 영향)

  • Choi, Kwan-Young;Yoon, Jae-Ryong;Kim, Hwi-Joong
    • Elastomers and Composites
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    • v.33 no.1
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    • pp.17-26
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    • 1998
  • Natural rubber was filled with 8 commercial carbon blacks covering range of rubber-grade products at different levels of filler loadings in order to investigate physical compound and vulcanizate properties. It was found that the curves of rubber property vs filler loading of both uncured compounds and vulcanizates can be superposed to one single master curve by introducing an effective volume fraction which is based on CDBP. The effective volume fraction, $V_{EFF}$ was utilized to explain the variation of the stiffness of all rubber compounds. The surface area-corrected effective volume fraction, V', was utilized to explain the formation of bound rubber, rebound and lambourn wear.

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Prediction and Evaluation of Rubber Components using Large Deformation Non-linear Finite Element Analysis (비선형 대변형 유한요소해석을 이용한 방진고무부품의 특성예측 및 평가)

  • Woo, Chang-Su;Kim, Wan-Doo;Cho, Seong-Do-Seong
    • Proceedings of the KSME Conference
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    • pp.286-291
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    • 2000
  • The finite element analyses of mechanical rubber components are executed to predict the behavior of deformation and stress distribution in destgn step. The non-linear properties of rubber which are described as strain energy functions are important parameters to design and evaluate rubber components. These are determined by material tests which are tension, compression and shear test. The behaviors of loads-displacements of rubber components such as a roll tubber spring and resilient ring and additional spring for railway suspension system are evaluated by using commercial FEA code. It is shown that the results by FEA simulations are in close agreement with the test results.

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Characteristic Prediction and Evaluation of Rubber Components for Railway Vehicle (철도차량용 방진고무부품 특성예측 및 평가)

  • Woo, Chang-Su;Park, Dong-Chul
    • Proceedings of the KSR Conference
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    • pp.83-89
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    • 2005
  • Rubber spring is used in primary suspension system for railway vehicle. This rubber spring has function which reduce vibration and noise, support the load carried in operation of rail vehicle. The non-linear properties of rubber which are described as strain energy function are important parameter to design and evaluate of rubber components. These are determined by material tests which are tension, compression and shear test. The behaviors of load-displacement of rubber spring for rail vehicle are evaluated by using commercial FEA code. It is shown that the results by FEA simulations are in close agreement with the test results

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Useful Lifetime Prediction of Coupling Rubber Pad for Railway Vehicles (철도차량 완충기 패드용 고무소재 수명예측)

  • Woo, Chang-Su;Park, Hyun-Sung;Park, Dong-Chul
    • Proceedings of the KSR Conference
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    • pp.923-931
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    • 2008
  • Coupling rubber pad are important components in railway vehicles. It can be used for reduce shock, vibration and noise. Simple tension, equi-biaxial tension and pure shear test were performed to acquire the coefficient of rubber material which were Mooney-Rivlin and Ogden model. The finite element analysis was executed to evaluate the behavior of deformation and stress distribution by using the commercial finite element analysis code. Useful life evaluation are very important in design procedure to assure the safety and reliability of the rubber components. In this paper, useful life prediction of rubber pad for railway vehicle were experimentally investigated. Accelerated heat-aging test for rubber material were carried. Compression set results changes as the threshold are used for assessment of the useful life and time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot.

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An Application of Non-linear Viscoelastic Model to Capillary Extrusion of Rubber Compounds (고무복합체의 모세관 압출에서 비선형 점탄성 모델의 적용)

  • Choi, S.H.;Lyu, M.Y.
    • Transactions of Materials Processing
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    • v.16 no.4
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    • pp.260-265
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    • 2007
  • Rubber compounds have high viscoelastic property. One of the viscoelastic behaviors during profile extrusion is the swelling of extrudate. In this study, die swells of rubber compounds at the capillary die have been investigated through experiment and computer simulation. Experiments and simulations have been performed using fluidity tester and commercial CFD code, Polyflow respectively. Die swells of rubber compounds in a capillary die were predicted using non-linear differential viscoelastic model, Phan-Thien-Tanner(PTT) model for various relaxation times and relaxation modes. The results of simulation were compared with the experiments. Pressure and velocity distribution, and circulation flows at the comer of capillary die have been investigated through computer simulation. It is concluded that the PTT model successfully represented the amount of the die swell of rubber compounds for various relaxation times at different modes.