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Assessment of strain measurement techniques to characterise mechanical properties of structural steel

  • Strain measurement is important in mechanical testing. A wide variety of techniques exists for measuring strain in the tensile test; namely the strain gauge, extensometer, stress and strain determined by machine crosshead motion, Geometric Moire technique, optical strain measurement techniques and others. Each technique has its own advantages and disadvantages. The purpose of this study is toStrain measurement is important in mechanical testing. A wide variety of techniques exists for measuring strain in the tensile test; namely the strain gauge, extensometer, stress and strain determined by machine crosshead motion, Geometric Moire technique, optical strain measurement techniques and others. Each technique has its own advantages and disadvantages. The purpose of this study is to quantitatively compare the strain measurement techniques. To carry out the tensile test experiments for S 235, sixty samples were cut from the web of the I-profile in longitudinal and transverse directions in four different dimensions. The geometry of samples are analysed by 3D scanner and vernier caliper. In addition, the strain values were determined by using strain gauge, extensometer and machine crosshead motion. Three techniques of strain measurement are compared in quantitative manner based on the calculation of mechanical properties (modulus of elasticity, yield strength, tensile strength, percentage elongation at maximum force) of structural steel. A statistical information was used for evaluating the results. It is seen that the extensometer and strain gauge provided reliable data, however the extensometer offers several advantages over the strain gauge and crosshead motion for testing structural steel in tension. Furthermore, estimation of measurement uncertainty is presented for the basic material parameters extracted through strain measurement.show moreshow less

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Metadaten
Document Type:Article
Author: Hem Bahadur Motra, Jörg HildebrandGND, Andrea Dimmig-Osburg
DOI (Cite-Link):https://doi.org/10.1016/j.jestch.2014.07.006Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20170425-31540Cite-Link
Parent Title (English):Engineering Science and Technology, an International Journal
Language:English
Date of Publication (online):2017/04/25
Year of first Publication:2014
Release Date:2017/04/25
Publishing Institution:Bauhaus-Universität Weimar
Institutes:Fakultät Bauingenieurwesen / Professur Bauchemie und Polymere Werkstoffe
Fakultät Bauingenieurwesen / Graduiertenkolleg 1462
First Page:260
Last Page:269
Tag:Affecting factors; Measurement uncertainty; Materials testing; Quantitative comparison; Strain comparison; Tensile test
GND Keyword:Baustahl; Werkstoffprüfung; Zugversuch
Dewey Decimal Classification:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften
BKL-Classification:51 Werkstoffkunde / 51.30 Werkstoffprüfung, Werkstoffuntersuchung
Licence (German):License Logo Creative Commons 4.0 - Namensnennung-Nicht kommerziell-Keine Bearbeitung (CC BY-NC-ND 4.0)