Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation
One of the important tasks of evaluating the integrity of mechanical process elements and structures is to determine the local mechanical properties. In this paper, experimental and numerical analyses of the mechanical behavior of an output inter-heater tube, made of 12H1MF heat-resistant s...
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| Format: | Article |
| Language: | English |
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Association of Chemical Engineers of Serbia
2020-01-01
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| Series: | Hemijska Industrija |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/0367-598X/2020/0367-598X2001051P.pdf |
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| author | Pavkov Vladimir D. Bakić Gordana M. Maksimović Vesna M. Petrović Aleksandar Lj. Mitrović Nenad R. Mišković Žarko Z. |
| author_facet | Pavkov Vladimir D. Bakić Gordana M. Maksimović Vesna M. Petrović Aleksandar Lj. Mitrović Nenad R. Mišković Žarko Z. |
| author_sort | Pavkov Vladimir D. |
| collection | DOAJ |
| description | One of the important tasks of evaluating the integrity of mechanical process
elements and structures is to determine the local mechanical properties. In
this paper, experimental and numerical analyses of the mechanical behavior
of an output inter-heater tube, made of 12H1MF heat-resistant steel, was
performed after 200,000 h of exploitation. During exploitation, the tube was
exposed to various mechanisms of damage including gas corrosion. The tube
was cut from a pipe system during reparations of a thermal power plant, and
then cold-deformed by bending to obtain a U-bend tube, which was then used
in the experiment. For this purpose, a specimen holder made of structural
steel S235 was specifically designed to test such a sample. The U-bend tube
was then exposed to the external compressive load during the experiment.
Experimental research was based on the application of the 3D digital image
correlation (DIC), while a finite element method (FEM) was applied in
numerical simulation performed by using the Abaqus software package. The 3D
DIC is an optical and contactless experimental method that allows
measurements of displacement fields and deformations of geometrically
complex structures. The Aramis system was used for the experimental analysis
as well as for verification of the numerical model. During the experiment,
the von Mises strain field was measured at the top of the U-bend tube, in
the tightening zone, as it represents a critical place for crack initiation
and propagation during the work of an inter-heater. Based on the obtained
results and a comparative analysis of experimental and numerical values of
the von Mises strain field at the U-bend tube, deviation of the model
predictions of about 18 % was determined. The FEM predicted smaller values
of the von Mises strain field compared to the DIC method. This is the result
of an incomplete geometry applied in the model due to deformation that
occurred in the bend zone of the U-bend tube, loss of material and the tube
surface damage due to the influence of gas corrosion during 200,000 h of
exploitation. Experimental analysis has confirmed that the U-bend tube,
after 200,000 h of exploitation, can remain in service even if it is damaged
due to the effect of gas corrosion. |
| first_indexed | 2024-04-13T12:32:42Z |
| format | Article |
| id | doaj.art-7830b801d2704ff1be62dc93762a805f |
| institution | Directory Open Access Journal |
| issn | 0367-598X 2217-7426 |
| language | English |
| last_indexed | 2024-04-13T12:32:42Z |
| publishDate | 2020-01-01 |
| publisher | Association of Chemical Engineers of Serbia |
| record_format | Article |
| series | Hemijska Industrija |
| spelling | doaj.art-7830b801d2704ff1be62dc93762a805f2022-12-22T02:46:47ZengAssociation of Chemical Engineers of SerbiaHemijska Industrija0367-598X2217-74262020-01-01741516310.2298/HEMIND190905005P0367-598X2001051PExperimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitationPavkov Vladimir D.0Bakić Gordana M.1Maksimović Vesna M.2Petrović Aleksandar Lj.3Mitrović Nenad R.4Mišković Žarko Z.5University of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, SerbiaUniversity of Belgrade, Faculty of Mechanical Engineering, Belgrade, SerbiaUniversity of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, SerbiaUniversity of Belgrade, Faculty of Mechanical Engineering, Belgrade, SerbiaUniversity of Belgrade, Faculty of Mechanical Engineering, Belgrade, SerbiaUniversity of Belgrade, Faculty of Mechanical Engineering, Belgrade, SerbiaOne of the important tasks of evaluating the integrity of mechanical process elements and structures is to determine the local mechanical properties. In this paper, experimental and numerical analyses of the mechanical behavior of an output inter-heater tube, made of 12H1MF heat-resistant steel, was performed after 200,000 h of exploitation. During exploitation, the tube was exposed to various mechanisms of damage including gas corrosion. The tube was cut from a pipe system during reparations of a thermal power plant, and then cold-deformed by bending to obtain a U-bend tube, which was then used in the experiment. For this purpose, a specimen holder made of structural steel S235 was specifically designed to test such a sample. The U-bend tube was then exposed to the external compressive load during the experiment. Experimental research was based on the application of the 3D digital image correlation (DIC), while a finite element method (FEM) was applied in numerical simulation performed by using the Abaqus software package. The 3D DIC is an optical and contactless experimental method that allows measurements of displacement fields and deformations of geometrically complex structures. The Aramis system was used for the experimental analysis as well as for verification of the numerical model. During the experiment, the von Mises strain field was measured at the top of the U-bend tube, in the tightening zone, as it represents a critical place for crack initiation and propagation during the work of an inter-heater. Based on the obtained results and a comparative analysis of experimental and numerical values of the von Mises strain field at the U-bend tube, deviation of the model predictions of about 18 % was determined. The FEM predicted smaller values of the von Mises strain field compared to the DIC method. This is the result of an incomplete geometry applied in the model due to deformation that occurred in the bend zone of the U-bend tube, loss of material and the tube surface damage due to the influence of gas corrosion during 200,000 h of exploitation. Experimental analysis has confirmed that the U-bend tube, after 200,000 h of exploitation, can remain in service even if it is damaged due to the effect of gas corrosion.http://www.doiserbia.nb.rs/img/doi/0367-598X/2020/0367-598X2001051P.pdfsteel 12h1mfgas corrosiondigital image correlationfinite element method |
| spellingShingle | Pavkov Vladimir D. Bakić Gordana M. Maksimović Vesna M. Petrović Aleksandar Lj. Mitrović Nenad R. Mišković Žarko Z. Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation Hemijska Industrija steel 12h1mf gas corrosion digital image correlation finite element method |
| title | Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation |
| title_full | Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation |
| title_fullStr | Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation |
| title_full_unstemmed | Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation |
| title_short | Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation |
| title_sort | experimental and numerical analyses of an u bend tube made of an output inter heater tube after exploitation |
| topic | steel 12h1mf gas corrosion digital image correlation finite element method |
| url | http://www.doiserbia.nb.rs/img/doi/0367-598X/2020/0367-598X2001051P.pdf |
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