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Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography

Jonathan Jones

Applied Sciences, Volume: 8, Issue: 3, Start page: 380

Swansea University Author: Jonathan Jones

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DOI (Published version): 10.3390/app8030380

Abstract

This paper describes the advantages and enhanced accuracy thermography provides to high temperature mechanical testing. This technique is not only used to monitor, but also to control test specimen temperatures where the infra-red technique enables accurate non-invasive control of rapid thermal cycl...

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Published in: Applied Sciences
ISSN: 2076-3417
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39082
first_indexed 2018-03-15T14:10:35Z
last_indexed 2018-05-14T19:26:16Z
id cronfa39082
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spelling 2018-05-14T14:01:24.6077108 v2 39082 2018-03-15 Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography bd50c45efec14ab64ff4c9e7d09a03bf Jonathan Jones Jonathan Jones true false 2018-03-15 EAAS This paper describes the advantages and enhanced accuracy thermography provides to high temperature mechanical testing. This technique is not only used to monitor, but also to control test specimen temperatures where the infra-red technique enables accurate non-invasive control of rapid thermal cycling for non-metallic materials. Isothermal and dynamic waveforms are employed over a 200–800 °C temperature range to pre-oxidised and coated specimens to assess the capability of the technique. This application shows thermography to be accurate to within ±2 °C of thermocouples, a standardised measurement technique. This work demonstrates the superior visibility of test temperatures previously unobtainable by conventional thermocouples or even more modern pyrometers that thermography can deliver. As a result, the speed and accuracy of thermal profiling, thermal gradient measurements and cold/hot spot identification using the technique has increased significantly to the point where temperature can now be controlled by averaging over a specified area. The increased visibility of specimen temperatures has revealed additional unknown effects such as thermocouple shadowing, preferential crack tip heating within an induction coil, and, fundamental response time of individual measurement techniques which are investigated further. Journal Article Applied Sciences 8 3 380 2076-3417 thermography; high temperature; dynamic temperature; thermocouple; pyrometer 31 12 2018 2018-12-31 10.3390/app8030380 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2018-05-14T14:01:24.6077108 2018-03-15T09:47:22.4662759 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Jonathan Jones 1 0039082-15032018095019.pdf jones2018(2).pdf 2018-03-15T09:50:19.9670000 Output 6757262 application/pdf Version of Record true 2018-03-15T00:00:00.0000000 true eng
title Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
spellingShingle Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
Jonathan Jones
title_short Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
title_full Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
title_fullStr Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
title_full_unstemmed Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
title_sort Enhancing the Accuracy of Advanced High Temperature Mechanical Testing through Thermography
author_id_str_mv bd50c45efec14ab64ff4c9e7d09a03bf
author_id_fullname_str_mv bd50c45efec14ab64ff4c9e7d09a03bf_***_Jonathan Jones
author Jonathan Jones
author2 Jonathan Jones
format Journal article
container_title Applied Sciences
container_volume 8
container_issue 3
container_start_page 380
publishDate 2018
institution Swansea University
issn 2076-3417
doi_str_mv 10.3390/app8030380
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 - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description This paper describes the advantages and enhanced accuracy thermography provides to high temperature mechanical testing. This technique is not only used to monitor, but also to control test specimen temperatures where the infra-red technique enables accurate non-invasive control of rapid thermal cycling for non-metallic materials. Isothermal and dynamic waveforms are employed over a 200–800 °C temperature range to pre-oxidised and coated specimens to assess the capability of the technique. This application shows thermography to be accurate to within ±2 °C of thermocouples, a standardised measurement technique. This work demonstrates the superior visibility of test temperatures previously unobtainable by conventional thermocouples or even more modern pyrometers that thermography can deliver. As a result, the speed and accuracy of thermal profiling, thermal gradient measurements and cold/hot spot identification using the technique has increased significantly to the point where temperature can now be controlled by averaging over a specified area. The increased visibility of specimen temperatures has revealed additional unknown effects such as thermocouple shadowing, preferential crack tip heating within an induction coil, and, fundamental response time of individual measurement techniques which are investigated further.
published_date 2018-12-31T06:22:27Z
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score 11.067157

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