Performance study on mounting system for displacement transducer in mechanical tests of timber samples using photogrammetry method

Mohamed, Ahmed, Zhang, Hexin, Deng, Yu, Lehmannd, Martin, Sigristd, Christophe, Uheida, Kal, Zheng, Yu, Bahadori-Jahromi, Ali ORCID: https://orcid.org/0000-0003-0405-7146, Shahidan, Shahiron and Caudouxa, Remi (2021) Performance study on mounting system for displacement transducer in mechanical tests of timber samples using photogrammetry method. Wood Material Science and Engineering. ISSN 1748-0272

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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.

Item Type: Article
Additional Information: © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group 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.
Uncontrolled Keywords: Mounting system of displacement transducer, mechanical test of timber samples, LVDT for timber test, photogrammetry method
Subjects: Construction and engineering
Related URLs:
Depositing User: Ali Bahadori-Jahromi
Date Deposited: 27 Sep 2021 15:25
Last Modified: 11 Oct 2021 10:06
URI: http://repository.uwl.ac.uk/id/eprint/8275

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