American Journal of Mechanical and Materials Engineering

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Investigation of Misalignment Affects During Creep Testing on the Miniature Pin-Loaded and the Sup-Size Uniaxial Creep Tests Specimens

Received: May 16, 2020    Accepted: May 29, 2020    Published: Jun. 16, 2020
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Abstract

Creep is one of the main engineering problems facing engineers dealing with high temperature components. These components have to be closely monitored, especially after serving 50% of their residual life. For many reason creep engineers has to use small material samples for creep assessments of these components. Many small creep test specimen types can be manufactured using these small material samples; this include the sup-size uniaxial creep test specimen and the pin loaded small creep test specimen. Considering the limitations and the difficulties associated with each testing method is another factor often taken in to account before choosing which specimen type can be used. Traditionally many of creep engineers tend to go for the sup-size uniaxial creep test specimen, because of it is similarity to the standard creep test specimen. However, this specimen type has some limitations; this is include the high possibility of misalignment during the loading application, and this is due to the small size of the specimen. The misalignment effect on the test results normally ignored which can lead to inaccurate results. This paper will be focusing on the misalignment effect on the sup-size uniaxial creep test specimen, and the one-bar and two-bar creep test specimens. Using different values of misalignment the creep results obtained from one-bar and two-bar specimens and the sup-size uniaxial creep test specimen will be compared. The P91 steel at 650°C, which is one of the high temperature materials, will be used for validation.

DOI 10.11648/j.ajmme.20200402.13
Published in American Journal of Mechanical and Materials Engineering ( Volume 4, Issue 2, June 2020 )
Page(s) 37-42
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Pin-Loaded Creep Test Specimen, OBS, TBS, Sup-Size Uniaxial Specimens, FEA Creep Analyses, Misalignments During Creep Testing Loading

References
[1] Hao S., Yang H., Elsworth D. (2017). An accelerating precursor to predict time-to-failure in creep and volcanic eruptions. Journal of Volcanology and Geothermal Research, 3431, 252-262. doi: 10.1016/j.jvolgeores.2017.07.009.
[2] Song M., Xu T., Y. Keyi, Yu H., Sun C. (2019), Creep failure of a steam pipe girth weld and NDT strategy on creep damage, Journal of Engineering Failure Analysis, 104, 673-681. doi: 10.1016/j.engfailanal.2019.06.048.
[3] Hyo-Jin K. (2005). Assessment of creep life fraction for in-service high-temperature components, Journal of Engineering Failure Analysis, 12 (4) 578-585. doi: 10.1016/j.engfailanal.2004.09.00.
[4] Piotrowski L., Chmielewski M., Golański G., Wieczorek P. (2019). Analysis of the possibility of creep damage detection in T24 heat resistant steel with the help of magnetic non-destestructive testing methods, Engineering Failure Analysis. 102, 384-394. doi: 10.1016/j.engfailanal.2019.04.054.
[5] Shlyannikov V., Tumanov A., Boychenko N. (2018). Creep-fatigue crack growth rate assessment using ductility damage model, International Journal of Fatigue, 116, 448-461. doi: 10.1016/j.ijfatigue.2018.07.003.
[6] Pasquale G., Filippo B., Grzegorz G. (2016). Analysis of creep stresses and strains around sharp and blunt V-notches, Theoretical and Applied Fracture Mechanics. 85, 435-446. Doi: 10.1016/j.tafmec.2016.06.003.
[7] Ali B. (2015). The Pin-Loaded Small One-Bar Specimen in Use to Determine Uniaxial and Multiaxial Creep Data, High. Temp. Mater. Proc., 34 (6), 563-572. Doi: 10.1515/htmp-2015-0029.
[8] Liu Y. J., Zhao B., Xu B., Yue Z. (2007). Experimental and numerical study of the method to determine the creep parameters from the indentation creep testing, Materials Science and Engineering: A, 456, 103-108. Doi: 10.1016/j.msea.2006.11.098.
[9] Evans M., Wang D. (2008). The small punch creep test: some results from a numerical... J Strain Anal Eng Des 45 (3): 141–164. doi: 10.1243/03093247JSA592 43.
[10] Hidenari T., Masami F. (2014). Set of conversion coefficients for extracting uniaxial creep data from pseudo-steady indentation creep test results, Materials Science and Engineering: A. 602, 98-104. Doi: 10.1016/j.msea.2014.02.060.
[11] Ali B., Tom H., Sun W. (2016). Small Two-Bar Specimen Creep Testing of Grade P91 Steel at 650°C. High Temperature Materials and Processes 35 (3): 243-252. DOI: 10.1515/htmp-2014-0188.
[12] Tom H., Ali B., Sun W. (2013). Analysis and Design of a Small, Two-Bar Creep Test Specimen, Journal of Engineering Materials and Technology. 135 (4): 100-109. Doi: 10.1115/1.4025192.
[13] Tom H., Ali B., Sun W. (2014). On the Determination of Material Creep Constants Using Miniature Creep Test Specimens, Journal of Engineering Materials and Technology, 136 (2): 1006-1016. doi: 10.1115/1.4026596.
[14] Ali B. (2014). Development of non-destructive small specimen creep testing techniques. PhD thesis, The University of Nottingham. DOI: 10.13140/RG.2.1.3286.3203.
[15] Garzillo A., Guardamagna C., Moscotti L., Ranzani L. (1996). A technique for the residual life assessment of high temperature components based on creep-rupture testing on welded miniature specimens. International Journal of Pressure Vessels and Piping. 66 (1-3) 223-232. Doi: 10.1016/0308-0161(95)00097-6.
[16] Ganesh K. J., Laha K. (2017). Localized creep characterization of 316LN stainless steel weld joint using Small Punch Creep test, Materials Science and Engineering: A. 705, 72-78. Doi: 10.1016/j.msea.2017.08.062.
[17] Prasanna H., Rajendra K., Udupa U.(2016). Indentation creep studies to evaluate the mechanical properties of stainless steel, Australian Journal of Mechanical Engineering, 14 (1), 39-43. Doi: 10.1080/14484846.2015.1093214.
[18] Andrésa D., Lorenzob M., Lacallea R., lvareza J, Alegrec J. (2016). Application of the Small Punch Creep test to predict times to rupture on magnesium alloys, Theoretical and Applied Fracture Mechanics Part A, 86, 45-50. doi: 10.1016/j.tafmec.2016.08.004.
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  • APA Style

    Balhassn Ali. (2020). Investigation of Misalignment Affects During Creep Testing on the Miniature Pin-Loaded and the Sup-Size Uniaxial Creep Tests Specimens. American Journal of Mechanical and Materials Engineering, 4(2), 37-42. https://doi.org/10.11648/j.ajmme.20200402.13

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    ACS Style

    Balhassn Ali. Investigation of Misalignment Affects During Creep Testing on the Miniature Pin-Loaded and the Sup-Size Uniaxial Creep Tests Specimens. Am. J. Mech. Mater. Eng. 2020, 4(2), 37-42. doi: 10.11648/j.ajmme.20200402.13

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    AMA Style

    Balhassn Ali. Investigation of Misalignment Affects During Creep Testing on the Miniature Pin-Loaded and the Sup-Size Uniaxial Creep Tests Specimens. Am J Mech Mater Eng. 2020;4(2):37-42. doi: 10.11648/j.ajmme.20200402.13

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  • @article{10.11648/j.ajmme.20200402.13,
      author = {Balhassn Ali},
      title = {Investigation of Misalignment Affects During Creep Testing on the Miniature Pin-Loaded and the Sup-Size Uniaxial Creep Tests Specimens},
      journal = {American Journal of Mechanical and Materials Engineering},
      volume = {4},
      number = {2},
      pages = {37-42},
      doi = {10.11648/j.ajmme.20200402.13},
      url = {https://doi.org/10.11648/j.ajmme.20200402.13},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.ajmme.20200402.13},
      abstract = {Creep is one of the main engineering problems facing engineers dealing with high temperature components. These components have to be closely monitored, especially after serving 50% of their residual life. For many reason creep engineers has to use small material samples for creep assessments of these components. Many small creep test specimen types can be manufactured using these small material samples; this include the sup-size uniaxial creep test specimen and the pin loaded small creep test specimen. Considering the limitations and the difficulties associated with each testing method is another factor often taken in to account before choosing which specimen type can be used. Traditionally many of creep engineers tend to go for the sup-size uniaxial creep test specimen, because of it is similarity to the standard creep test specimen. However, this specimen type has some limitations; this is include the high possibility of misalignment during the loading application, and this is due to the small size of the specimen. The misalignment effect on the test results normally ignored which can lead to inaccurate results. This paper will be focusing on the misalignment effect on the sup-size uniaxial creep test specimen, and the one-bar and two-bar creep test specimens. Using different values of misalignment the creep results obtained from one-bar and two-bar specimens and the sup-size uniaxial creep test specimen will be compared. The P91 steel at 650°C, which is one of the high temperature materials, will be used for validation.},
     year = {2020}
    }
    

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  • TY  - JOUR
    T1  - Investigation of Misalignment Affects During Creep Testing on the Miniature Pin-Loaded and the Sup-Size Uniaxial Creep Tests Specimens
    AU  - Balhassn Ali
    Y1  - 2020/06/16
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    DO  - 10.11648/j.ajmme.20200402.13
    T2  - American Journal of Mechanical and Materials Engineering
    JF  - American Journal of Mechanical and Materials Engineering
    JO  - American Journal of Mechanical and Materials Engineering
    SP  - 37
    EP  - 42
    PB  - Science Publishing Group
    SN  - 2639-9652
    UR  - https://doi.org/10.11648/j.ajmme.20200402.13
    AB  - Creep is one of the main engineering problems facing engineers dealing with high temperature components. These components have to be closely monitored, especially after serving 50% of their residual life. For many reason creep engineers has to use small material samples for creep assessments of these components. Many small creep test specimen types can be manufactured using these small material samples; this include the sup-size uniaxial creep test specimen and the pin loaded small creep test specimen. Considering the limitations and the difficulties associated with each testing method is another factor often taken in to account before choosing which specimen type can be used. Traditionally many of creep engineers tend to go for the sup-size uniaxial creep test specimen, because of it is similarity to the standard creep test specimen. However, this specimen type has some limitations; this is include the high possibility of misalignment during the loading application, and this is due to the small size of the specimen. The misalignment effect on the test results normally ignored which can lead to inaccurate results. This paper will be focusing on the misalignment effect on the sup-size uniaxial creep test specimen, and the one-bar and two-bar creep test specimens. Using different values of misalignment the creep results obtained from one-bar and two-bar specimens and the sup-size uniaxial creep test specimen will be compared. The P91 steel at 650°C, which is one of the high temperature materials, will be used for validation.
    VL  - 4
    IS  - 2
    ER  - 

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Author Information
  • College of Petroleum Engineering, Al-Jafra University, Zalla, Libya

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