• Title/Summary/Keyword: 소성변형률에너지밀도

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Prediction of Low Cycle Fatigue Life for Inconel 617 using Strain Energy Method (변형률 에너지법을 이용한 Inconel 617의 저주기피로 수명 예측)

  • Kim, Duck-Hoi;Kim, Ki-Gwang;Kim, Jae-Hoon;Lee, Young-Shin;Park, Won-Sik
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.285-290
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    • 2004
  • Low cycle fatigue tests are performed on the Inconel 617 that be used for a hot gas casing. The relation between strain energy density and numbers of cycles to failure is examined in order to predict the low cycle fatigue life of Inconel 617. The life predicted by the strain energy method is found to coincide with experimental data and results obtained from the Coffin-Manson method. Also the cyclic behavior of Inconel 617 is characterized by cyclic hardening with increasing number of cycle at room temperature.

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Fatigue Life Analysis and Prediction of 316L Stainless Steel Under Low Cycle Fatigue Loading (저사이클 피로하중을 받는 316L 스테인리스강의 피로수명 분석 및 예측)

  • Oh, Hyeong;Myung, NohJun;Choi, Nak-Sam
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.12
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    • pp.1027-1035
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    • 2016
  • In this study, a strain-controlled fatigue test of widely-used 316L stainless steel with excellent corrosion resistance and mechanical properties was conducted, in order to assess its fatigue life. Low cycle fatigue behaviors were analyzed at room temperature, as a function of the strain amplitude and strain ratio. The material was hardened during the initial few cycles, and then was softened during the long post period, until failure occurred. The fatigue life decreased with increasing strain amplitude. Masing behavior in the hysteresis loop was shown under the low strain amplitude, whereas the high strain amplitude caused non-Masing behavior and reduced the mean stress. Low cycle fatigue life prediction based on the cyclic plastic energy dissipation theory, considering Masing and non-Masing effects, showed a good correlation with the experimental results.

Prediction of low cycle fatigue life for Inconel 617 (Inconel 617의 저주기피로 수명 예측)

  • Kim K.G.;Kim D.H.;Kim J.H.;Lee Y.S.;Paik W.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.612-615
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    • 2005
  • Low cycle fatigue tests are performed on the Incollel 617 that be used fur a hot gas casing. The relation between strain energy density and numbers of cycles to failure is examined in order to predict the low cycle fatigue life of Inconel 617. The life predicted by the strain energy method is found to coincide with experimental data and results obtained from the Coffin-Mansun method. Also the cyclic behavior of Inconel 617 is characterized by cyclic hardening with increasing number of cycle at room temperature.

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Comparison and Evaluation of Low-Cycle Fatigue Life Prediction Methods Using Cu-Cr Alloy Developed for Rocket Engines (로켓엔진용 구리크롬 합금의 저주기 피로수명 예측방법 비교 및 평가)

  • Jongchan Park;Jae-Hoon Kim;Keum-Oh Lee
    • Journal of the Korean Society of Propulsion Engineers
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    • v.26 no.5
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    • pp.1-10
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    • 2022
  • For Cu-Cr alloy developed for rocket engines, estimated fatigue lives were calculated using various fatigue life prediction methods and compared with fatigue life acquired from low-cycle fatigue tests. The utilized methods for fatigue life prediction are as follows: Coffin-Manson relation, plastic/total strain energy density relations, Smith-Watson-Topper relation, Tomkins relation, and Jahed-Varvani relation. As results of estimation of fatigue lives, it satisfied within scatter band two compared to the test fatigue lives in all methods. The quantitative calculation of the deviation of predicted fatigue lives gives that the total strain energy density relation presents the best result.

Low Cycle Fatigue Life Prediction of HSLA Steel Using Total Strain Energy Density (전변형률 에너지밀도를 이용한 고강도 저 합금강의 저주기 피로수명 예측)

  • Kim, Jae-Hoon;Kim, Duck-Hoi
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.6
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    • pp.166-175
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    • 2002
  • Low cycle fatigue tests are performed on the HSLA steel that be developed for a submarine material. The relation between strain energy density and numbers of cycles to failure is examined in order to predict the low cycle fatigue life of HSLA steel. The cyclic properties are determined by a least square fit techniques. The life predicted by the strain energy method is found to coincide with experimental data and results obtained from the Coffin-Manson method. Also the cyclic behavior of HSLA steel is characterized by cyclic softening with increasing number of cycle at room temperature. Especially, low cycle fatigue characteristics and microstructural changes of HSLA steel are investigated according to changing tempering temperatures. In the case of HSLA steel, the $\varepsilon$-Cu is farmed in $550^{\circ}C$ of tempering temperature and enhances the low cycle fatigue properties.