• 제목/요약/키워드: Test Temperature

검색결과 10,026건 처리시간 0.039초

얇은 평판의 환경시험에서 유도온도 예측에 대한 연구 (STUDY ON PREDICTION OF THE INDUCED TEMPERATURE IN ENVIRONMENTAL TEST)

  • 이정용;백상화;박소진
    • 한국전산유체공학회지
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    • 제13권4호
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    • pp.24-32
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    • 2008
  • Environmental test is divided into operation test and storage test. The temperature of storage test is induced temperature which is considered with all sort of the heat source. Induced temperature is the temperature to be adapted to each item and platform and can be induced by computer simulation, laboratory, and real field test. We considered the induced temperature to be associated with solar heat source. In this research. First, we compared the induced temperature which be occurred by one experiment for thin plate in solar test chamber with the other one which be occurred by computer simulation to be SolidWorks 2007 COSMOS FloWorks. After this verification, we showed induced temperature which can be occurred when the test item is stored. Especially, we bring out the induced temperature by applying the ambient temperatures which is presented by MIL-STD-810F and brought out in preceding research.

전동식 조향 장치용 ECU 의 환경 내구 시험 시간 단축을 위한 설계 검증 시험 사양 변경 사례 (An Example of Modification of Design Validation Test Specification to Reduce the Environmental Durability Test Time of Electronic Control Unit for Motor-Driven Power Steering system)

  • 김태훈;강동영;정인승
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.1309-1313
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    • 2008
  • This paper suggests an example of modification of the durability test specifications of electronic control unit for an automotive system in phase of design validation. The basic concept to redefine the specifications of durability test is based on the Arrhenius relationship for accelerated temperature test and the modified Coffin-Manson model for temperature cycle test. The ambient temperature of the powered-event durability test is increased to reduce the required test time of the current specification. Furthermore, the holding time between the events to cool down the temperature of the components is shortened and the resultant temperature rise affects the durability of the components. Thus, the acceleration factor due to the increased temperature range of temperature cycle is also estimated by the modified Coffin-Manson model.

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18Cr 페라이트계 스테인리스강의 용접부 저온 특성 평가 (Evaluation of Low Temperature Properties in 18Cr Ferritic Stainless Steel Welds)

  • 이원배;우인수;엄상호;이종봉
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2007년 추계학술발표대회 개요집
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    • pp.138-140
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    • 2007
  • This study aimed to evaluate the low temperature properties of the 18Cr ferritic stainless steel weld. Applied welding methods were LB(Laser Beam) and GTA(Gas Tungsten Arc) welding to compare the different low temperature properties of the welds. Low temperature properties were evaluated by the Charpy impact, Erichsen and Expansion test at low temperature. LB weld showed superior low temperature properties in the cases of the Charpy impact test and expansion test at low temperature, while GTA weld showed a superior low temperature property in the case of Erichsen test at low temperature. The different low temperature properties with test methods are still under analysis and may be due to different crack path depending on the microstructure, test speed and stress concentration during test.

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국산 고체 알루미늄 전해 커패시터의 가속수명시험 개발 및 국외 선진업체 제품과의 특성 비교 (Development of Accelerated Life Tests for Solid Aluminum Electrolyte Capacitor Made by Domestic Manufacturing Company and Comparison of Characteristics between Domestic Products and Foreign Advanced Products)

  • 박정원;이중휘
    • 한국신뢰성학회지:신뢰성응용연구
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    • 제2권1호
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    • pp.1-14
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    • 2002
  • High temperature operating test, temperature humidity test and temperature cycling were performed at various test levels for solid aluminum electrolyte capacitors made by domestic manufacturing company and foreign advanced manufacturing company. It was found that main failure mode of solid aluminum electrolyte capacitors was the decrease of their capacitances. The decrease of their capacitances has the same pattern in these tests. Test result for comparison of characteristics between domestic products and foreign advanced products shows that domestic products have the shorter lifetime and their capacitances decrease more rapidly in high temperature operating test and temperature humidity test. Also in these tests, accelerated tests for high temperature operating test and temperature humidity test were developed.

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고온 SHPB실험에서 온도의 영향 (The effect of temperature in high temperature SHPB test)

  • 박경준;양현모;민옥기
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집A
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    • pp.349-354
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    • 2001
  • The split Hopkinson pressure bar has been used for a high strain rate impact test. Also it has been developed and modified for compression, shear, tension, elevated temperature and subzero tests. In this paper, SHPB compression tests have been performed with pure titanium at elevated temperatures. The range of temperature is from room temperature to $1000^{\circ}C$ with interval of $200^{\circ}C$. To raise temperature of the specimen, a radiant heater which is composed of a pair of ellipsoidal cavities and halogen lamps is developed at high temperature SHPB test. There are some difficulties in a high temperature test such as temperature gradient, lubrication and prevention of oxidation of specimen. The temperature gradient of specimen is affected by the variation of temperature. Barreling occurred at not properly lubricated specimen. Stress-strain relations of pure titanium have been obtained in the range of strain rate at $1900/sec{\sim}2000/sec$ and temperature at $25^{\circ}C{\sim}1000^{\circ}C$.

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철도차량 고무 현가부품의 내한성 시험기준연구 (A Study on the Test Standards at Low Temperature of Rubber Suspension Components of Railway Vehicle)

  • 윤태호;장승호;최병일;이찬우;나희승
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.372-376
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    • 2004
  • In this paper, the standard test methods at low temperature of rubber suspension components of railway vehicle are investigated and reviewed. In order to connect the TKR(Trans-Korean Railway)-TSR(Trans-Siberian Railway), it is necessary to evaluate the performance of rubber suspenion components of railway vehicle. In the current Korean Standard, the test method at low temperature of railway vehilce components and the test method of rubber bellows of air spring are specified. But, the specified test temperature is higher than the the operating temperature of TSR railway. So, the in-depth research for the test method and performance evaluation technique of rubber suspension component at low temperature is necessary and current KS code should be adjusted.

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A Study on the Hot Spot Temperature in 154kV Power Transformers

  • Kweon, Dong-Jin;Koo, Kyo-Sun;Woo, Jung-Wook;Kwak, Joo-Sik
    • Journal of Electrical Engineering and Technology
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    • 제7권3호
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    • pp.312-319
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    • 2012
  • The life of a power transformer is dependent on the life of the cellulose paper, which influenced by the hot spot temperature. Thus, the determination of the cellulose paper's life requires identifying the hot spot temperature of the transformer. Currently, however, the power transformer uses a heat run test is used in the factory test to measure top liquid temperature rise and average winding temperature rise, which is specified in its specification. The hot spot temperature is calculated by the winding resistance detected during the heat run test. This paper measures the hot spot temperature in the single-phase, 154kV, 15/20MVA power transformer by the optical fiber sensors and compares the value with the hot spot temperature calculated by the conventional heat run test in the factory test. To measure the hot spot temperature, ten optical fiber sensors were installed on both the high and low voltage winding; and the temperature distribution during the heat run test, three thermocouples were installed. The hot spot temperature shown in the heat run test was $92.6^{\circ}C$ on the low voltage winding. However, the hot spot temperature as measured by the optical fiber sensor appeared between turn 2 and turn 3 on the upper side of the low voltage winding, recording $105.9^{\circ}C$. The hot spot temperature of the low voltage winding as measured by the optical fiber sensor was $13.3^{\circ}C$ higher than the hot spot temperature calculated by the heat run test. Therefore, the hot spot factor (H) in IEC 60076-2 appeared to be 2.0.

Ti-Ni계 형상기억 합금의 피로특성에 관한 연구 (A Study on the Fatigue Properties of Ti-Ni Shape Memory Alloys)

  • S.Y Kim;S. Miyazaki
    • Journal of Advanced Marine Engineering and Technology
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    • 제21권5호
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    • pp.482-490
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    • 1997
  • The effects of strain amplitude. test temperature and stress on the fatigue properties for Ti-Ni wires were investigated using a rotary bending fatigue tester specially designed for wires. The fatigue test results were discussed in connection with the static tensile properties. The DSC measurement was conducted after fatigue test in order to clarify the change of transformation behavior due to the progress of fatigue. Under the temperature below or near the Af, the strain amplitude($\varepsilon_a$)-failure life (Nf) curve showed to be composed of three straight lines with two turning points. Of the 2 turning points, the upper one was coincident with the elastic limit strain and the lower one with the proportional limit strain. With rising of the test temperature above Af, the pattern of $\varepsilon_a$-Nf curve changed gradually to composition of 2 straight lines. The $\varepsilon_a$-Nf curve shifted depending on test temperature. In the short and medium life zones, the higher the temperature was, the shorter the fatigue life. However, in the long life zone, above the Af temperature, the fatigue life was not affected by the temperature. The transformation enthalpy measured after fatigue test was dependent on Nf, $\varepsilon_a$, and test temperature.

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한반도 지역의 환경시험 온도 일주기 연구 (A Study on Daily Temperature Cycle of Environmental Test in the Korean Peninsula)

  • 이정용
    • 한국군사과학기술학회지
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    • 제10권3호
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    • pp.62-70
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    • 2007
  • Most design temperature of environmental test in korea is based on the standard of Department of Defense. There are few studies to establish temperature standard. Besides the representative environmental test guide 'MIL-STD-810F' encourage to tailor to generate the most relevant test data possible and to test to make a match of test environment with operational environment. Under these circumstances, it is irrational to comply with baseless daily cycle. Thus the study about design method of test temperature is essential. So, the daily cycles to be appropriate to the Korean peninsula was presented in this study. And this research shows how to derive two main element, frequency-of-occurrence and daily maximum (minimum) temperature in daily cycles, in case we can not find the daily cycle.

박판 스프링용 탄소공구강재(SK4M)의 시험온도에 따른 기계적 특성 (The Effects of the Testing Temperatures on the Mechanical Properties of the Carbon Tool Steel(SK4M) for Flat Spring)

  • 류태호;원시태;박상언;임철록
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 추계학술대회 논문집
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    • pp.693-696
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    • 2002
  • This study examined the effects of the testing temperature on the mechanical properties of the carbon tool steel (SK4M) for flat spring. Hardness test and fatigue test were performed at room temperature ($20^{\circ}C$). Tensile test and creep test were performed at temperature range $20^{\circ}C$ ~$160^{\circ}C$. The micro-vickers hardness values of SK4M was Hv=584. The Elastic modulus, tensile strength and yield strength of SK4M at 160t test temperature were decreased 0.92 time, 0.97 time and 0.82 time those of SK4M at 2$0^{\circ}C$ test temperature, respectively. The maximum creep strain for 100hr at creep temperature ($80^{\circ}C$ ~$160^{\circ}C$) and creep stress ($37.4Kgf/\textrm{mm}^2$ ~$93.6Kgf/\textrm{mm}^2$) was 0.572%. The fatigue limit of SK4M was $94Kgf/\textrm{mm}^2$.

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