• Title/Summary/Keyword: dynamic torsion test

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A Study on the Simulation Model Verification for Performance Estimation of Torsion Beam Axle (토션빔액슬 성능 평가를 위한 해석 모델 검증에 관한 연구)

  • Choi, Sung-Jin;Park, Jung-Won;Jeon, Kwang-Ki;Lee, Dong-Jae;Choi, Gyoo-Jae;Park, Tae-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.2
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    • pp.107-113
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    • 2006
  • The torsion beam axle type is widely used in the rear suspension for small passenger cars due to low cost, good performance, etc. To develop the torsion beam axle, it is necessary to estimate the characteristics of rear suspension from the design process. The characteristics estimation of the torsion beam axle is performed using FEM, dynamic simulation and is verified the real test. In this study, the natural frequency and roll stiffness of the torsion beam axle were measured by FEM, and the reliability of the FE model was evaluated according to the comparison of test data. This study presents a unique method for the finite element modeling and analysis of the torsion beam axle. The results of the FEA were verified using test data.

Vibration Analysis Model Development of the Solid Axles (일체형 차축의 진동 해석 모델 개발)

  • Jun, Kab-Jin;Choi, Sung-Jin;Park, Tae-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.147-150
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    • 2005
  • The torsion beam axle type is widely used in the rear suspension for small passenger car because of low cost, good performance and etc. The FE and dynamic analysis using the computer are very helpful for the efficiency of the torsion beam design. First of all, the reliability on the computational model must be verified for the analysis. In this study, The FE model of the torsion beam was verified according to comparison with he test data. And after making the flexible body using the FE model, the dynamic characteristic of the tubular type torsion beam axles was compared with that of the V-beam type.

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Deformation Behavior and Dynamic Recrystallization of Torsion-Tested Alloy 718 (Alloy718의 비틀림변형과 동적재결정)

  • Park, N.K.;Kim, C.H.;Kim, N.Y;Lee, D.G.;Yeom, J.T.
    • Transactions of Materials Processing
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    • v.15 no.8 s.89
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    • pp.591-596
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    • 2006
  • Torsion testing was employed to investigate the deformation and recrystallization behavior of coarse-grained Alloy 718, and the results are compared with the compression testing results. Mechanical testing was conducted on bulk Alloy718 samples within the temperature ranges, $1000^{\circ}C{\sim}1100^{\circ}C$. The strain gradient formed in the torsion specimens resulted in a recrystallization behavior which varied along the radial direction from the center to the surface. The flow curves based on effective stress and effective strain as obtained by Fields and Backofen's isotropic deformation theory and the dynamic recrystallization within the compression tested samples and torsion tested samples are different. The different deformation and recrystallization behavior can be rationalized by the fact that the deformation in the coarse-grained torsion specimens is not uniform and thus the strain gradient within the specimens cannot be analytically predicted by FE simulation. Thus, the extent of recrystallization cannot be properly predicted by the established recrystallization equations based on compression tests.

Effect of Microstructures on the Deformation Behavior of Ti-6Al-4V Alloy at Ultra High Strain rate (Ti-6Al-4V합금의 미세조직에 따른 초고속 변형특성)

  • 이유환;이동근;이성학;최준홍;허선무;이종수
    • Journal of the Korea Institute of Military Science and Technology
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    • v.5 no.3
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    • pp.89-97
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    • 2002
  • In this study, the effect of $\alpha$-phase morphology on the dynamic deformation behavior at ultra high strain rate was investigated by EBW(Explosive Bridge Wire) test. All of tests and analyses were conducted on three typical microstructures of Ti-6Al-4V alloy, i.e. equiaxed, widmanstatten and bimodal microstructures. The spall strength and HEL(Hugoniot Elastic Limit) of the specimens that have the thickness of 2mm and 4mm were highest with the bimodal microstructure. These results were similar with previous study which was performed by dynamic torsion test(Kolsky torsion test).

Investigation of High Temperature Deformation Behavior in Compression and Torsion of Ti-6Al-4V Alloy (Ti-6Al-4V합금의 비틀림 및 압축변형에 따른 고온변형거동 고찰)

  • Yeom, J.T.;Jung, E.J.;Kim, J.H.;Hong, J.K.;Park, N.K.;Lee, C.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.05a
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    • pp.435-438
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    • 2008
  • High temperature deformation of Ti-6Al-4V alloy with a lamellar colony microstructure was investigated by hot compression and torsion tests. The torsion and compression tests were carried out under a wide range of temperatures and strain rates with true strain up to 2 and 0.7, respectively. The processing maps were generated on the basis of compression and torsion test data and using the principles of dynamic materials modeling (DMM). The shapes of the strain-stress curves in alpha-beta region and processing maps obtained on the two different tests have been compared with a view to evaluate the effect of the microstructure evolution on the flow softening behavior of Ti-6Al-4V alloy with a lamellar colony microstructure.

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The Effect of Microstructure on the Static and Dynamic Deformation Behavior of Ti-6Al-4V Alloy (Ti-6Al-4V 합금의 미세조직에 따른 정적 및 동적 변형에 관한 연구)

  • Lee D. G.;Lee Y. H.;Lee S. H.;Hur S. M.;Lee C. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2001.10a
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    • pp.277-280
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    • 2001
  • The effects of a -phase morphology on the static and dynamic deformation behavior of a Ti-6Al-4V alloy was investigated in this study. Static tension test, static and dynamic tension test and hot compression test were conducted on three microstructures of Ti-6Al-4V alloy, i.e., equiaxed, widmanstatten and bimodal microstructures. Fracture surfaces of all three microstructures represented ductile fracture appearance, though the formation of adiabatic shear bands was noticed at dynamic torsion test. The susceptibility of forming adiabatic shear bands was greatest in the equiaxed microsoucture and lowest in the bimodal microstructure, which was evidenced by hot compression test.

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Study on Dynamic Characteristics and Performance of Tip Jet Rotor Using Small-scaled Rotor (축소로터를 이용한 Tip Jet 로터의 성능 및 동특성 연구)

  • Kwon, Jae Ryong;Baek, Sang Min;Rhee, Wook;Lee, Jae Ha
    • Journal of Aerospace System Engineering
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    • v.12 no.2
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    • pp.30-36
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    • 2018
  • In this study, a small-scaled test system for a tip jet rotor was developed to contribute to the research on unmanned compound rotorcraft. The performance and dynamic characteristics of the tip jet rotor were investigated using the test system. The diameter of the tip jet rotor was set to 2m in consideration of the size of the test site and the pneumatic supply capacity of the. The rotating speed of the rotor was controlled by the pressure of the compressed air. The thrust and forces during the rotor rotation were measured using a load measuring device. A hydraulic actuator was installed for the dynamic test and full-bridge strain gages were attached to the root of each blade to measure the flap, lag, and torsion-wise responses generated when the rotor is excited by the actuator. The performance and dynamic characteristic tests were conducted at various rotor speeds and blade pitches. In order to check the validity of the test results, the results were also compared with the CAMRAD II analysis.

Effects of Strain Rate and Temperature on the Hot Strength for Single Phase Cu-Zn Alloy (단상조직을 갖는 Cu-Zn합금의 고온강도에 미치는 변형속도와 온도의 영향)

  • 권용환;유연철
    • Transactions of Materials Processing
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    • v.4 no.2
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    • pp.159-168
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    • 1995
  • The torsion tests in the range of $550~800^{\circ}C$, $5.0{\times}10^{-3}~5.0{\times}10^0/sec$ were performed to study the effects of strain rate$(\.{\varepsilon})$ and temperature(T) on the hot strength of Cu-Zn alloy. High temperature flow stresses of this alloy increased with increasing $\.{\varepsilon}$ and/or decreasing T, and than the more grain refinement could be obtained. The flow curves exhibited a peak followed by a steady steady state regime as a result of dynamic recrystallization. The hot strength dependence of $\.{\varepsilon}$ and T was described by a hyperbolic sine law, $\.{\varepsilon}=A(sinh0.017{\sigma})^4.81$exp(-216KJ/mol). Hot strength could be reduced at the arbitary condition, $\.{\varepsilon}$ and T, by constitutive parameter Z(Zenner-Hollomon parameter), $Z=A(sinh{\alpha}{\sigma})^n=\.{\varepsilon}$exp(Q/RT).

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Development of Torsion Bar for Antiroll-Bar Assembly for Express Train (고속철도용 안티롤바 어셈블리의 토션바 개발)

  • Tominaga, Yasutoshi;Pyun, Young-Sik;Kim, Dong-Il;Choe, Do-Hyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.9
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    • pp.979-984
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    • 2012
  • An antiroll-bar assembly is a precision component that is designed to control the rolling of railway cars. It is important for ensuring a safe and comfortable ride. A torsion bar is the main part of the antiroll-bar assembly. Now, this part is classified as a consumable, and it is imported into Korea from France. Therefore, there is a strong need to domestically develop a torsion bar suitable for Korean conditions and to reduce cost and improve quality. In this study, an antiroll bar is developed, and it is analyzed and tested by using a road histogram measured on Korean railroads. This bar shows satisfactory results in a comparison with the imported bar. It has a novel design featuring a ring cover made of SUS steels to prevent the corrosion of the torsion bar. Its safety is examined through CAE analysis and wear tests. It is found that its design does not result in a significant difference in static and fatigue safety. Two different SUS steels were investigated in terms of their wear resistance, and the best one was adopted.

Design Eccentricity of RC Building Structures with Torsional Irregularity (비틀림 비정형성을 가진 RC 건물의 설계편심)

  • 이한선;고동우
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.140-143
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    • 2003
  • Recently, many high-rise reinforced concrete (RC) bearing wall structures of multiple occupancy have been constructed, which have the irregularities of weak (or soft) story and torsion at the lower stories simultaneously. The study compared the eccentricity of such a building predicted by design codes, EC 8, IBC 2000 and UBC 97, and by the test results through a series of shaking table tests of 1:12 model. Based on the comparison of the predicted eccentricity and the test result, the conclusions are drawn as follow: Accidental torsion due to the uncertainty on the properties of structure can be reasonably predicted by using the dynamic analysis with the center of mass being shifted by 5 percent of the dimension of the building perpendicular to the direction of the excitations than by using equivalent lateral force procedure

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