An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing

Deterioration assessment of materials is essential to the continued effective operation of critical components operating, at high temperatures and stresses, in thermal power plants. Within progressive inspection strategies, small punch creep testing (SPCT) presents an effective method for establishi...

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Autores principales:	van Rooyen Melody, Becker Thorsten, Mostafavi Mahmoud
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/6b8733d5f1fb442caf502ec66a1b3c6b
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spelling	oai:doaj.org-article:6b8733d5f1fb442caf502ec66a1b3c6b2021-12-02T17:13:35ZAn Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing2261-236X10.1051/matecconf/202134700026https://doaj.org/article/6b8733d5f1fb442caf502ec66a1b3c6b2021-01-01T00:00:00Zhttps://www.matec-conferences.org/articles/matecconf/pdf/2021/16/matecconf_sacam21_00026.pdfhttps://doaj.org/toc/2261-236XDeterioration assessment of materials is essential to the continued effective operation of critical components operating, at high temperatures and stresses, in thermal power plants. Within progressive inspection strategies, small punch creep testing (SPCT) presents an effective method for establishing the degree of creep exhaustion of in-service power engineering alloys on account of the small volume of material required (Ø8 mm × 0.5 mm discs). These tests make the application of complex strain fields, analogous to the strain field experienced by the service components, possible. In addition, this work explores the application of a noncontact digital image correlation (DIC) method to the full-field measurement of strains which is not possible through traditional extensometry. The accelerated SPCT tests were performed on 12 % Cr ex-service steels subjected to 600 °C. Experimental methodologies and challenges associated with ex situ DIC-SPCT are discussed including equipment and parameter selection, speckle pattern application, preforming requirements and loading method. It is shown that the developed DIC technique using a stereo microscope, airbrushed speckle patterns, sombrero-preformed discs and interrupted tests can be used to compare surface strain development in various aged forms of the ex-service steel. Such an approach is valuable to understanding strain development in small punch tests and to assist in the comparative damage assessment of ex-service power plant materials.van Rooyen MelodyBecker ThorstenMostafavi MahmoudEDP SciencesarticleEngineering (General). Civil engineering (General)TA1-2040ENFRMATEC Web of Conferences, Vol 347, p 00026 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 van Rooyen Melody Becker Thorsten Mostafavi Mahmoud An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing
description	Deterioration assessment of materials is essential to the continued effective operation of critical components operating, at high temperatures and stresses, in thermal power plants. Within progressive inspection strategies, small punch creep testing (SPCT) presents an effective method for establishing the degree of creep exhaustion of in-service power engineering alloys on account of the small volume of material required (Ø8 mm × 0.5 mm discs). These tests make the application of complex strain fields, analogous to the strain field experienced by the service components, possible. In addition, this work explores the application of a noncontact digital image correlation (DIC) method to the full-field measurement of strains which is not possible through traditional extensometry. The accelerated SPCT tests were performed on 12 % Cr ex-service steels subjected to 600 °C. Experimental methodologies and challenges associated with ex situ DIC-SPCT are discussed including equipment and parameter selection, speckle pattern application, preforming requirements and loading method. It is shown that the developed DIC technique using a stereo microscope, airbrushed speckle patterns, sombrero-preformed discs and interrupted tests can be used to compare surface strain development in various aged forms of the ex-service steel. Such an approach is valuable to understanding strain development in small punch tests and to assist in the comparative damage assessment of ex-service power plant materials.
format	article
author	van Rooyen Melody Becker Thorsten Mostafavi Mahmoud
author_facet	van Rooyen Melody Becker Thorsten Mostafavi Mahmoud
author_sort	van Rooyen Melody
title	An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing
title_short	An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing
title_full	An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing
title_fullStr	An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing
title_full_unstemmed	An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing
title_sort	experimental approach to the application of digital image correlation to small punch creep testing
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/6b8733d5f1fb442caf502ec66a1b3c6b
work_keys_str_mv	AT vanrooyenmelody anexperimentalapproachtotheapplicationofdigitalimagecorrelationtosmallpunchcreeptesting AT beckerthorsten anexperimentalapproachtotheapplicationofdigitalimagecorrelationtosmallpunchcreeptesting AT mostafavimahmoud anexperimentalapproachtotheapplicationofdigitalimagecorrelationtosmallpunchcreeptesting AT vanrooyenmelody experimentalapproachtotheapplicationofdigitalimagecorrelationtosmallpunchcreeptesting AT beckerthorsten experimentalapproachtotheapplicationofdigitalimagecorrelationtosmallpunchcreeptesting AT mostafavimahmoud experimentalapproachtotheapplicationofdigitalimagecorrelationtosmallpunchcreeptesting
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An Experimental Approach to the Application of Digital Image Correlation to Small Punch Creep Testing

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