Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636427
Title: Small punch test for the assessment of hydrogen-damaged and thermally-aged for pressurized equipment
Author: De Persio, F.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2004
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Abstract:
The SP (Small Punch) testing technique was applied to the low alloy - 2 ¼ 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.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.636427  DOI: Not available
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