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Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment. / Franco Di Persio

Swansea University Author: Franco Di Persio

Abstract

The purpose of this project was to assess the reliability of the SP (Small Punch) testing method as an alternative mechanical test technique for evaluation of the residual life and integrity assessment of components in ageing plants. The SP testing technique was applied to the low alloy - 2&frac...

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Published: 2004
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42630
first_indexed 2018-08-02T18:55:10Z
last_indexed 2018-08-03T10:10:40Z
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recordtype RisThesis
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spelling 2018-08-02T16:24:29.8993997 v2 42630 2018-08-02 Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment. 62c80e9d88f5d8a4caa306e35772ae21 NULL Franco Di Persio Franco Di Persio true true 2018-08-02 The purpose of this project was to assess the reliability of the SP (Small Punch) testing method as an alternative mechanical test technique for evaluation of the residual life and integrity assessment of components in ageing plants. The SP testing technique was applied to the low alloy - 2&frac14;Cr 1Mo V modified ferritic steel widely selected for construction of high temperature components in petrochemical plants. The main two test facilities employed during this project were a SP creep testing rig and a SP tensile rig. These equipments assured good accuracy and repeatability of results. As a key component of the development of the test methodology, a new analytical stress-strain model was based on measurements taken on SP specimens from interrupted tests looking at the different phases of the sample deformation. Its implementation offered an important tool for converting the load normally employed in a SP test to the equivalent state of stress and strain, which defines the material behaviour. This proposed stress-strain model was successfully validated, comparing the SP creep results with the conventional uniaxial creep outcome for the as-received material. Thereafter, such a model was used to assess the potential and the sensitivity of the SP technique for evaluating the degree of damage in the aged material, with special emphasis on hydrogen-aged material. The results illustrate that when combined with an appropriate model the SP creep testing technique was shown to be an appropriate tool for integrity assessment of in-service plant components. E-Thesis Materials science. 31 12 2004 2004-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.8993997 2018-08-02T16:24:29.8993997 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Franco Di Persio NULL 1 0042630-02082018162509.pdf 10805388.pdf 2018-08-02T16:25:09.6030000 Output 7490489 application/pdf E-Thesis true 2018-08-02T16:25:09.6030000 false
title Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
spellingShingle Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
Franco Di Persio
title_short Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
title_full Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
title_fullStr Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
title_full_unstemmed Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
title_sort Small punch test for the assessment of hydrogen-damaged and thermally-aged steels for pressurized equipment.
author_id_str_mv 62c80e9d88f5d8a4caa306e35772ae21
author_id_fullname_str_mv 62c80e9d88f5d8a4caa306e35772ae21_***_Franco Di Persio
author Franco Di Persio
author2 Franco Di Persio
format E-Thesis
publishDate 2004
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The purpose of this project was to assess the reliability of the SP (Small Punch) testing method as an alternative mechanical test technique for evaluation of the residual life and integrity assessment of components in ageing plants. The SP testing technique was applied to the low alloy - 2&frac14;Cr 1Mo V modified ferritic steel widely selected for construction of high temperature components in petrochemical plants. The main two test facilities employed during this project were a SP creep testing rig and a SP tensile rig. These equipments assured good accuracy and repeatability of results. As a key component of the development of the test methodology, a new analytical stress-strain model was based on measurements taken on SP specimens from interrupted tests looking at the different phases of the sample deformation. Its implementation offered an important tool for converting the load normally employed in a SP test to the equivalent state of stress and strain, which defines the material behaviour. This proposed stress-strain model was successfully validated, comparing the SP creep results with the conventional uniaxial creep outcome for the as-received material. Thereafter, such a model was used to assess the potential and the sensitivity of the SP technique for evaluating the degree of damage in the aged material, with special emphasis on hydrogen-aged material. The results illustrate that when combined with an appropriate model the SP creep testing technique was shown to be an appropriate tool for integrity assessment of in-service plant components.
published_date 2004-12-31T04:22:39Z
_version_ 1868575182320304128
score 11.109323

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