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우창수(Changsu Woo),김완두(Wandoo Kim),최성신(Sungshin Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The material characteristics and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. This paper discusses the material test and accelerated heat aging test were carried out to predict the useful life of NBR and EPDM rubber mount for compression motor which is used in refrigerator. In order to investigate the heat-aging effects on the material properties, the crosslink density, modulus at 100%, stress-strain curves were obtained from the results of uniaxial and equi-biaxial tensile test. Compression set results changes as the threshold are used for assessment of the useful life and the time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot. The useful life at variable temperatures are obtained in the Arrhenius relationship
우창수(Changsu Woo),박현성(Hyunsung Park),조득환(Deughwan Joe),전영식(Youngsig Jun),김주엽(Juyeob Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Nanocomposites were prepared by compounding of the rubber and the clay. The measurements of the static and dynamic mechanical properties for different compositions over a temperature range (+70 to +100 degree C) showed that the mechanical properties of these rubber-clay nanocomposites are superior than that of the existing rubber material. In this study, by using the parameter of maximum Green-Lagrange strains appearing at the locations, we can prove the relations between fatigue life and maximum Green-Lagrange strain, and the correlations between test piece test and bench test of actual rubber component. In order to predict the fatigue life of rubber components at the design stage, the simple procedure of life prediction is suggested. Predicted fatigue lives of the rubber engine mount agreed fairly well with the experimental fatigue lives.
우창수(Changsu Woo),박현성(Hyunsung Park),김경식(Kyungsik Kim),박동철(Dongchul Park),강문채(Munchae Kwang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Rubber spring is used in primary suspension system for rail vehicle. The chevron spring has function which reduce vibration and noise, support the load carried in operation of rail vehicle. The computer simulation using the non-linear finite element analysis program MARC executed to predict and evaluate the load capacity and stiffness for the chevron spring. The appropriate shape and material properties are proposed to adjust the required characteristics of chevron spring in the three modes of flexibility. Also, several samples of chevron spring are manufactured and experimented. It is shown that the predicted values agree well the results obtained from experiments.
우창수(Changsu Woo),김완두(Wandoo Kim),최병익(Byungik Choi),이학주(Hakjoo Lee),이성훈(Seonghoon Lee),조현철(Hyunchul Jo),신외기(Waegi Shin) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. Fatigue lifetime prediction methodology of the rubber component was proposed by incorporating the finite element analysis and fatigue damage parameter from fatigue test. Finite element analysis of 3D dumbbell specimen and rubber component were performed based on a hyper-elastic material model determined from material test. The Green-Lagrange strain at the critical location determined from the FEM was used for evaluating the fatigue damaged parameter of the natural rubber. Fatigue life of the rubber component are predicted by using the fatigue damage parameter at the critical location. Predicted fatigue lifes of the rubber component agreed fairly well the experimental fatigue lives.
우창수(Changsu Woo),김완두(Wandoo Kim),김영길(Younggil Kim),신외기(Waegi Shin),이성훈(Seonghoon Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. Recently, the design, analysis and evaluation technology was required to achieve the high quality, fidelity, reliability of rubber products. However, rubber manufacturing companies of our country have uesd the method of trial and error and experience in the process of a compound mixing, manufacturing and improvement of rubber properties. The objectives of this study are to establish the test methods of rubber material and to make the database of rubber material properties and to evaluate the performance of rubber components and to construct the prediction system of fatigue life. Fatigue lifetime prediction methodology of the rubber component was proposed by incorporating the finite element analysis and fatigue damage parameter from fatigue test.
우창수(Changsu Woo),김완두(Wandoo Kim),권재도(Jaedo Kwon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Fatigue life prediction methodology of the vulcanized natural rubber was proposed by incorporating the finite element analysis and fatigue damage parameter determined from the fatigue tests. Nonlinear finite element analysis of the 3-D dumbbell specimen of natural rubber was performed based on a hyperelastic material model determined from the tension, compression and shear tests. The Green-Lagrange strain at the critical location determined from the FEA was used for evaluating the fatigue damage parameter of natural rubber. Fatigue tests were formed using the 3-D dumbbell specimens with different levels of maximum strain and various hardness. Fatigue life curves can be effectively represented by a following single function using the Green-Lagrange strain. Predicted fatigue lives of the rubber component agreed fairly well the experimental fatigue lives.
우창수(Changsu Woo),박현성(Hyunsung Park),김영길(Younggil Kim),신외기(Waegi Shin),조득환(Deughwan Joe) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Successful modeling and design of rubber components relies on both the selection of an appropriate strain energy function and an accurate determination of material constants in the function. Material constants in the strain energy functions can be determined from the curve fitting of experimental stress-strain data. The uniaxial tension, equi-biaxial tension and pure shear test were performed to acquire the constants of the strain energy functions which were Mooney-Rivlin and Ogden model. Finite element analysis was very important in design procedure to assure the safety and reliability of automotive rubber component. Nonlinear finite element analysis was executed to evaluate the behavior of deformation and strain distribute by using the commercial finite element code. Also, the fatigue tests were carried out to obtain the fatigue failure. Fatigue failure was initiated at the critical location was observed during the fatigue test of rubber component, which was the same result predicted by the finite element analysis.