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[구조강도부문] 스웨이징시 마찰이 P/S 호스의 기계적 거동에 미치는 효과
김형제(Hyungje Kim),김병탁(Byungtak Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper, finite element analyses for the deformation characteristics of a power steering hose during the swaging process are performed in order to investigate the stress and the strain levels of the hose components with respect to the jaw strokes. The analysis, in which the friction is taken into account, is conducted, and its result is compared with the frictionless situation so as to check the differences of two results and decide whether the frictional condition was worth due consideration or not in the stress analysis of a high pressure hose. Contact conditions identical to the manufacturing process are applied, and the properties of hose materials based on the experimental data are used in the analysis. Because the inner rubber of the hose has an important role in the hose efficiency, the result interpretations are focused on the stress and the strain variations of the inner hose contacted with the nipple.
동력 조향장치용 호스와 금속 용구사이의 접촉력에 관한 연구
김형제(H. J. Kim),김병탁(B. T. Kim),김광희(K. H. Kim),윤문철(M. C. Yoon) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A power steering hose is generally manufactured by the swaging process. In this process the hose is inserted into metal fittings and compressed in the radial direction by the jaws to clamp the hose with metal fittings together. In case they are subjected to various mechanical and thermal loads under the real operating conditions, the oil in hose can leak at the parts of small clamping forces. Also, jaw stroke is very important design factor during the swaging process. In this paper, the contact forces between the power steering hose and the metal fittings are analyzed with respect to the jaw stroke using the finite element method. Investigations were focused on the stress and strain values at the maximum jaw and the contact normal forces after the jaw release, between the hoses and the metal fittings.
김형제(H. J. Kim),김병탁(B. T. Kim) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A reinforced hydraulic hose includes rebar layers of a steel wire to control internal pressure. Usually, the hose behavior is affected by the resultant of the longitudinal and circumferential forces produced by the internal pressure. The rebar layers can appear the most ideal rebar effect when they are arranged to the same direction as the resultant force. The braid angle applied in the rebar layers is an important factor in determining ultimate burst pressure and overall hose life. In this paper, especially the rebar element were used to take the layer orientation such as the relative position, the number and the angle into consideration. The stress variation characteristics of a reinforced hydraulic hose is analyzed with respect to the internal pressure using the finite element method.
김형제(Hyung Je Kim),김병탁(Byung Tak Kim) 한국고무학회 2001 엘라스토머 및 콤포지트 Vol.36 No.3
N/A The rubber pads of a tank which undergo dynamic deformations with the sufficient amplitudes and frequencies lead to a considerable internal temperature rise due to the heat generation. The heat generation which is dependent on the viscoelastic characteristics of a rubber is due to the conversion of partial mechanical energy into thermal energy identical to the area of hysteresis loop. Heat generation without adequate heat dissipation leads to heat build-up and the excessive temperature rise exerts a bad influence upon the performance and the life of rubber products. In this paper, temperature distributions of the rubber pads of a tank track subjected to dynamic loads are obtained under the assumption of the steady state. Heat generation rates used in this finite element analysis are acquired through experiments and the computed temperature fields are displayed in isothermal contour regions.
김형제(Hyung-Je Kim),김병탁(Byung-Tak Kim),고성위(Sung-Wi Koh) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
A Hydraulic hose is composed of the rubber materials and braid layers to support the tensile force. A power steering hose is generally producted by the swaging process. The hose is subjected to various mechanical and thermal loads under the real operation circumstance, the oil in hose can leak at the parts of small clamping force. Jaw stroke, the kind of material, friction coefficient and the shape of metal fittings are an important factor in the hose efficiency and life. In this paper, the mechanical behavior characteristics of a hydraulic hose are analyzed with respect to the jaw strokes and friction coefficients using the finite element method. Investigations were focused on the variations of strain and stress at the maximum jaw stroke between the hoses and metal fittings, and the deformation shape of a hydraulic hose after the jaw release.