• Title, Summary, Keyword: Thermal Stress

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Structural Durability Analysis due to Hole Configuration Variation of Bike Disc Brake (자전거 디스크 브레이크 구멍 형상 변화에 따른 구조적 내구성 해석)

  • Han, Moonsik;Cho, Jaeung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.5
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    • pp.44-49
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    • 2014
  • As expansion and contraction of bike disk brake are happened continuously by temperature at repeated urgent braking. In this study, 3 kinds of model are designed according to configurations of holes and thermal durabilities on bike disk brake are investigated by comparing 3 models through temperature and thermal analyses. Maximum thermal stress happened at the disk contacted with pad and the connection part fixing disk rotor. Instead of initial state, the temperature is uniformly distributed at transient state. As the area of hole at disk rotor face becomes wider, thermal stress becomes lower at the initial state. On the other hand, in case the number of holes increases, thermal stress becomes lower at the elapsed time of 100 seconds. The thermal durability of bike disk brake can be improved by applying this study result with configurations of holes.

Thermal Residual Stress Analysis of Fiber Reinforced Metal Laminate (섬유강화금속적층판(FRML)의 열응력 해석)

  • 김위대;양승희
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.61-64
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    • 2002
  • Fiber reinforced metal laminate(FRML) consists of alternations layers of metal and fiber reinforced composite. The difference in the coefficients of thermal expansion between metal and composite layer produces remarkable amount of thermal residual stresses between layers. Generally, FRML shows a tensile stress in metal layers, a compressive stress in composite layers after curing. In this study, the thermal residual stresses of several types of FRML are investigated to get the best combination of metal and composite which can reduce the thermal residual stresses. The residual stress level is compared with the strength of each layers to explain the fracture mechanism of FRML.

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Analysis of Thermal Stress and Deformation of Casting Roll in Twin Roll Strip Casting Process (쌍롤형 박판주조공정에서 주조 롤의 열응력 및 열변형 해석)

  • Park, Cheol-Min;Kim, Wan-Su;Park, Gyeong-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.9
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    • pp.1943-1951
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    • 2002
  • The casting roll design is one of the most important requirements in twin roll strip casting process. Coupled analyses of heat transfer and deformation for the cast roll are carried out by use of the finite element program MARC to examine the thermal stress and deformation. The effects of several factors on thermal stress and deformation are also investigated. The amount of thermal stress increases when the ni thickness increases and when the casting speed and the copper sleeve thickness decrease.

Determination of thermal Stress Intensity Factors for General Cusp-Crack Shaped Rigid Inclusion (일반 형상의 커프스형 강체균열에 대한 열응력세기계수 결정)

  • 이강용;장용훈
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.6
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    • pp.1216-1220
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    • 1992
  • In case that a general cusp-crack shaped inclusion expressed in a polynominal form of conformal mapping function exists in a two dimensional elastic body under uniform heat flow, the complex potential and thermal stress intensity factors are derived. Two thermal boundary conditions are considered, one an insulated rigid inclusion and the other a rigid inclusion with fixed boundary temperature. The previous solutions of the thermal stress intensity factors for symmetrical airfoil and lip type rigid inclusions are obtained from the general solution of the thermal stress intensity factors.

A Study on the Thermal Stresses Analysis of the Flat Mould (평평한 금형(金型)의 열응력(熱應力)에 관한 연구(硏究))

  • Min, Soo-Hong;Koo, Bon-Kwon;Kim, Ok-Sam
    • Journal of Korea Foundry Society
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    • v.11 no.3
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    • pp.245-253
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    • 1991
  • It is known that the analysis of thermal stresses is substantially important in optimal design of casting mould. In this paper unsteady state thermal stresses generated in ingot and mould during the solidification process are analyzed by the two dimensional thermal elasto-plastic analysis. Distribution of temperature and stress of the mould is calculated using the finite element method and compared with experimental result. The significant results obtained in this study are as follows. At the early stage of the casting process, abrupt temperature change was shown in the vicinity of the inner surface of the mould. The largest temperature gradient is occurred at the corner of the mould. In the thermal stress analysis, compressible stress occurred in the inside wall of the mould where as tensile stress on outside wall. Smaller thermal stress is observed at the rounded corner. It is also observed that the shown is influenced by the thickness of the wall. A fairly good coincidence is found between analytical and experimental results, showing that the proposed analytical methodology is reliable.

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Analysis of Heat Flow and Thermal Stress for Divertors (디버터의 열유동 및 열응력 해석 1)

  • Lee, Sang-Yun;Kim, Hong-Bae
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.1
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    • pp.238-245
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    • 1999
  • For the optimal design of plasma facing components of a fusion reactor, thorough understanding of thermal behavior of high heat. nux components are required. The purpose of this research is to investigate the characteristics of heat flow and thermal stress in divertors which are exposed to high heat load varing with time and space-Numerical simulations of heat now and thermal stress for three types of diverter are performed using finite volume method and finite element method. Respectly, commercial FLUENT code are used in the heat flow simulation, and maximum surface temperature, temperature distribution and cooling rate are calculated. Commercial ABQUS code are used for calculating temperature distribution. thermal stress, strain and displacement. Through this computer simulation. design data for cooling system and Structural provided.

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Thermal Stress Analysis on Exhaust System of Car (자동차 배기시스템의 열응력해석)

  • Cho, Jae-Ung;Han, Moon-Sik
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.1
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    • pp.42-48
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    • 2010
  • Exhaust system of car is studied by thermal analysis. Temperature is uniformly distributed from $22{^{\circ}C}$ to $200{^{\circ}C}$ on exhaust system due to heat transfer. The largest deformation of 2.6919mm is shown at the left end of muffler. The inner face combined with exhaust manifold is applied by the largest thermal equivalent stress of 914.61MPa. After the elapsed time of 360 second, the end of muffler is shown to have the largest deformation of 2.5538mm and the bolt combined with this muffler is applied by the largest equivalent stress of 887.79MPa. By reinforcing material at the end of muffler or fastened bolt shown with highest thermal deformation or stress, the durability at this system can be improved.

A Study on the Thermal Stress Analysis of Thermally Sprayed Ceramic Coating (세라믹 용사시의 열응력해석에 관한 연구)

  • 정동원;김귀식;오맹종;조종래
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.11
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    • pp.227-232
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    • 1998
  • The purpose of this study is to develop a numerical method for analyzing the transient heat transfer and evaluating the residual stress. The analysis of heat transfer and thermal stress are carried out by three-dimensional finite element method. Thermal spraying is one of the most common surface coating techniques to be used for many applications. In order to improve the mechanical properties of flame-sprayed ceramic coating layer, the accurate and effective analysis of heat transfer and thermal stress is essentially required.

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Thermal Stress Analysis for a Ventilated Disk Brake of Railway Vehicles (철도 차량용 제동디스크의 열응력 해석)

  • Lee Y.M.;Park J.S.;Seok C.S.;Lee C.W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1617-1621
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    • 2005
  • In this study, as a basic research to improve braking efficiency of a ventilated disk brake, we carried out a thermal stress analysis. From analysis result, we knew that a maximum mechanical stress by braking pressure and friction force is applicable to 5 percent of yield strength and has no effect on a fatigue life's decrease for brake disk material. While, a maximum thermal stress by frictonal heat is applicable to 43 percent of yield strength and locates on a friction surface. So, we have found that a thermal stress is the primary factor of crack initiation on a friction surface of disk brake

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Experimental Estimation of Thermal Durability in Ceramic Catalyst Supports for Passenger Car (승용차용 세라믹 촉매 담체의 열적 내구성의 실험적 평가)

  • Baek, Seok-Heum;Kim, Sung-Yong;Seung, Sam-Sun;Yang, Hyup;Joo, Won-Sik;Cho, Seok-Swoo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.12
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    • pp.1157-1164
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    • 2007
  • Ceramic honeycomb structures have performed successfully as catalyst supports for meeting hydrocarbon, carbon monoxide and nitrous emissions standards for gasoline-powered vehicles. Three-way catalyst converter has to withstand high temperature and thermal stress due to pressure fluctuations and vibrations. Thermal stress constitutes a major portion of the total stress which the ceramic catalyst support experiences in service. In this study, temperature distribution was measured at ceramic catalyst supports. Thermal durability was evaluated by power series dynamic fatigue damage model. Radial temperature gradient was higher than axial temperature gradient. Thermal stresses depended on direction of elastic modulus. Axial stresses are higher than tangential stresses. Tangential and axial stresses remained below thermal fatigue threshold in all engine operation ranges.