Design and development of an accessible clip gauge extensometer for CMOD measurement in fracture mechanics

Design and development of an accessible clip gauge extensometer for CMOD measurement in fracture mechanics | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 4 November 2025 V1 Latest version Share on Design and development of an accessible clip gauge extensometer for CMOD measurement in fracture mechanics Authors : Isaías Chamorro-Cruz 0000-0003-4820-2392 , Alessandra Gallegos-Sánchez , Hilario Hernández-Moreno , Esteban Antunez-Valencia , Sergio Torres-Cedillo 0000-0002-3297-6409 [email protected] , Gabriella Piccinelli Bocchi , Jorge Iván Reyes-Guzmán 0009-0007-7321-0892 , José Alberto Picaso-Martínez , and Jacinto Cortés-Pérez Authors Info & Affiliations https://doi.org/10.22541/au.176229736.66393889/v1 Published Engineering Reports Version of record Peer review timeline 303 views 167 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract not-yet-known not-yet-known not-yet-known unknown This work reports on the design, construction, calibration, and validation of a low-cost, clip-on extensometer for crack mouth opening displacement (CMOD) measurements in fracture mechanics specimens. The device employs readily available components and integrates a full Wheatstone bridge with instrumentation-amplifier conditioning to achieve high measurement resolution at minimal cost. A dedicated calibration protocol, combined with the compliance-based framework specified in the standard, enables direct conversion of bridge output to CMOD. The device’s performance was verified on compact tension specimens through a monotonic test, and cross-validated against a finite element simulation and analytical displacement prediction. The results demonstrated linear-elastic agreement within experimental uncertainty across a verification window, as well as a reproducible CMOD–time histories suitable for both toughness evaluation and crack-growth assessments. By providing full documentation of the hardware and manufacture procedures, this study facilitates rapid replication in contexts where commercial instruments may be cost-prohibitive. Furthermore, it reaffirms that CMOD measurement using clip-on extensometers remains a robust and essential technique, complementing modern optical methods. Supplementary Material File (manuscript.docx) Download 6.66 MB Information & Authors Information Version history V1 Version 1 04 November 2025 Peer review timeline Published Engineering Reports Version of Record 18 Feb 2026 Published Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords extensometer finite element method fracture mechanics strain gauge Authors Affiliations Isaías Chamorro-Cruz 0000-0003-4820-2392 Universidad Nacional Autonoma de Mexico Facultad de Estudios Superiores Aragon View all articles by this author Alessandra Gallegos-Sánchez Instituto Politecnico Nacional Escuela Superior de Ingenieria Quimica e Industrias Extractivas View all articles by this author Hilario Hernández-Moreno Instituto Politecnico Nacional Escuela Superior de Ingenieria Mecanica y Electrica Unidad Ticoman View all articles by this author Esteban Antunez-Valencia Universidad Nacional Autonoma de Mexico Facultad de Estudios Superiores Aragon View all articles by this author Sergio Torres-Cedillo 0000-0002-3297-6409 [email protected] Universidad Nacional Autonoma de Mexico Facultad de Estudios Superiores Aragon View all articles by this author Gabriella Piccinelli Bocchi Universidad Nacional Autonoma de Mexico Facultad de Estudios Superiores Aragon View all articles by this author Jorge Iván Reyes-Guzmán 0009-0007-7321-0892 Universidad del Valle de Mexico - Campus Coyoacan - Tlalpan View all articles by this author José Alberto Picaso-Martínez Instituto Politecnico Nacional Unidad Zacatenco Escuela Superior de Ingenieria Mecanica y Electrica View all articles by this author Jacinto Cortés-Pérez Universidad Nacional Autonoma de Mexico Facultad de Estudios Superiores Aragon View all articles by this author Metrics & Citations Metrics Article Usage 303 views 167 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Isaías Chamorro-Cruz, Alessandra Gallegos-Sánchez, Hilario Hernández-Moreno, et al. Design and development of an accessible clip gauge extensometer for CMOD measurement in fracture mechanics. Authorea . 04 November 2025. DOI: https://doi.org/10.22541/au.176229736.66393889/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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