Dr Ahmed Mohamed A.Mohamed2@napier.ac.uk
Lecturer
Performance study on mounting system for displacement transducer in mechanical tests of timber samples using photogrammetry method
Mohamed, Ahmed; Zhang, Hexin; Deng, Yu; Lehmann, Martin; Sigrist, Chistophe; Uheida, Kal; Zheng, Yu; Bahadori-Jahromi, Ali; Shahidan, Shahiron; Caudoux, Remi
Authors
Prof Johnson Zhang j.zhang@napier.ac.uk
Professor
Yu Deng
Martin Lehmann
Chistophe Sigrist
Kal Uheida
Yu Zheng
Ali Bahadori-Jahromi
Shahiron Shahidan
Remi Caudoux
Abstract
This paper presents a unique study to reveal the effect of the mounting system of the linear variable differential transformer (LVDT) on the mechanical property tests of timber materials. This effect has been overlooked in the past but proven to be significant enough that will distort the measurements completely if the displacement is relatively small. The reason for causing this error is because the LVDT is not directly measuring targeting points on a sample, instead, the LVDT is measuring the distance between one point on the stop-end (where the tip rested on) and the holder. The wrong common sense hopes that this point on the stop-end and holder reliably following the movement of the sample points. But this study reveals that it is not always the case with the aid from the photogrammetry method. The messages of this paper are simple but alertly useful and, important: (1) the mounting system and the method of installation of the LVDTs have a significant impact on the actual displacement measurement in a mechanical properties test of timber materials. It should be carefully designed and validated before the actual test; (2) the displacement distribution is not uniform across the timber sample. This should be taken into account when selecting the mounting points of the LVDTs. Testing standards should consider this effect when recommending displacement transducers to be used in a timber-related test.
Citation
Mohamed, A., Zhang, H., Deng, Y., Lehmann, M., Sigrist, C., Uheida, K., Zheng, Y., Bahadori-Jahromi, A., Shahidan, S., & Caudoux, R. (2022). Performance study on mounting system for displacement transducer in mechanical tests of timber samples using photogrammetry method. Wood Material Science and Engineering, 17(6), 937-953. https://doi.org/10.1080/17480272.2021.1978107
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 5, 2021 |
Online Publication Date | Sep 22, 2021 |
Publication Date | 2022 |
Deposit Date | Sep 5, 2021 |
Publicly Available Date | Sep 22, 2021 |
Journal | Wood Material Science & Engineering |
Print ISSN | 1748-0272 |
Electronic ISSN | 1748-0280 |
Publisher | Taylor & Francis |
Peer Reviewed | Peer Reviewed |
Volume | 17 |
Issue | 6 |
Pages | 937-953 |
DOI | https://doi.org/10.1080/17480272.2021.1978107 |
Keywords | mounting system of displacement transducer, mechanical test of timber samples, LVDT for timber test, photogrammetry method |
Public URL | http://researchrepository.napier.ac.uk/Output/2799463 |
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Performance study on mounting system for displacement transducer in mechanical tests of timber samples using photogrammetry method
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http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way.
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