PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 37 (2022) 730–737

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Therefore, this work reports the development of a portable testing machine that can be assembled on INEGI’s optical table and is compatible with our previously developed 3D ESPI setup. The machine is an inexpensive custom design for static or quasi-static loading, with the main objective of withstanding a maximum load and velocity of 20 kN and 240 mm/min, respectively. The machine was built around a brushless dc motor and controller, both from Trinamic, and is currently being successfully used with ESPI methodology. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Interferometric methods; machine control; material testing; electronic speckle pattern interferometry 1. Introduction When performing material testing procedures, it is usually interesting to be able to measure the specimen’s real displacement. Classically, this was performed using single-use strain gauges, but in recent years non-contact image based methods have been seeing increased usage, particularly Digital Image Correlation. Nonetheless, there are Abstract Material testing procedures are increasingly using image-based methods for strain field measurements, with extensive usage of Digital Image Co relation in parti ul r. Nonetheless, th re i inter st in extending this use to other image-based i terferom tric methods with increased resolution, such as El ctronic Sp ckle Pa tern Interferometry (ESPI) and S arography. In par icular, ESPI require very stable conditi ns f r measurem n , usually achieved by ass mbly on an optical table. Therefore, thi work reports the developm nt of a portable testing machine that can be assembled on INEGI’s optical table and is compatible with ur previously l ed 3D ESPI setup. The machine is an inexpensive custom design for tatic or quasi-stat c l ading, with e main objective of withstanding a maximum lo d a d velocity of 20 kN and 240 mm/min, respectively. The m chine as built around a brushless dc motor and controller, b th from Trinamic, and is currently being successfully used with ESPI m thodology. © 2022 T e Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of Pedro Miguel Guimara s Pires Moreira K ywords: Interferom tric methods; machine control; material testing; electronic speckle pattern interferometry 1. Introduction When performing material testing procedures, it is usually interesting to be able to measure the specimen’s real displac ment. Classically, this was perf rmed u ing single-use strain gauges, but in recent years non-contact image ba ed methods have been seeing inc eased usage, particularly D git l Image Cor lation. No etheless, there are ICSI 2021 The 4th International Conference on Structural Integrity Development of a small-scale testing machine for use with interferometric monitoring methods Pedro J. Sousa a *, Shayan Eslami a , Frederico P. Direito a , Pedro M. G. P. Moreira a a INEGI, Institute of Science and Innovation in Mechanical Engineering and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal Abstract Material testing procedures are increasingly using image-based methods for strain field measurements, with extensive usage of Digital Image Correlation in particular. Nonetheless, there is interest in extending this use to other image-based interferometric methods with increased resolution, such as Electronic Speckle Pattern Interferometry (ESPI) and Shearography. In particular, ESPI requires very stable conditions for measurement, usually achieved by assembly on an optical table. ICSI 2021 The 4th International Conference on Structural Integrity Development of a small-scale testing machine for use with interferometric monitoring methods Pedro J. Sousa a *, Shayan Eslami a , Frederico P. Direito a , Pedro M. G. P. Moreira a a INEGI, Institute of Science and Innovation in Mechanical Engineering and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal

* Corresponding author. E-mail address: psousa@inegi.up.pt * Corresponding author. E-mail address: psousa@inegi.up.pt

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of Pedro Miguel Guimara s Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.003