PSI - Issue 25

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ScienceDirect

Procedia Structural Integrity 25 (2020) 316–323 Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 ( 19) 000–000

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

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers Abstract The miniature uniaxial tensile testing is a simple yet powerful method to characterise the behaviour of a material. Based on this technique, an experimental system was developed aiming the determination of sheet metal mechanical properties, using the Digital Image Correlation (DIC) technique. A tensile-compression loading device was designed with a maximum load capacity of 2.5 kN. The device includes custom-made clamps that guarantee the alignment of the sample with respect to the loading axis. To evaluate the aptitude of miniature samples and the use of Digital Image Correlation (DIC) in this type of scale, some tensile tests were performed using di ff erent types of miniaturised geometries and the results were compared with a macro specimen reference. Additionaly, some cyclic tests were also performed, in order to evaluate the possibilities of developed prototype on the tension compression loading paths. c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY- C-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) P r-revie lin : Peer-review under responsibility of the VCSI1 organizers. Keywords: tensile test; mechanical characterisation material; miniaturised speciment; Digital Image Correlation (DIC) 1st Virtual Conference on Structural Integrity – VCSI1 Development of a mini-tensile approach for sheet metal testing using Digital Image Correlation Daniel J. Cruz a,b, ∗ , Sahand P. Shamchi a,b , Abel D. Santos a,b , Rui L. Amaral b , Paulo J. Tavares b , PMGP Moreira b a Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s / n, 4200-465 Porto, Portugal b INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal Abstract The miniature uniaxial tensile testing is a simple yet powerful method to characterise the behaviour of a material. Based on this technique, an experimental system was developed aiming the determination of sheet metal mechanical properties, using the Digital Image Correlation (DIC) technique. A tensile-compression loading device was designed with a maximum load capacity of 2.5 kN. The device includes custom-made clamps that guarantee the alignment of the sample with respect to the loading axis. To evaluate the aptitude of miniature samples and the use of Digital Image Correlation (DIC) in this type of scale, some tensile tests were performed using di ff erent types of miniaturised geometries and the results were compared with a macro specimen reference. Additionaly, some cyclic tests were also performed, in order to evaluate the possibilities of developed prototype on the tension compression loading paths. c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review line: Peer-review under responsibility of the VCSI1 organizers. Keywords: tensile test; mechanical characterisation material; miniaturised speciment; Digital Image Correlation (DIC) 1st Virtual Conference on Structural Integrity – VCSI1 Development of a mini-tensile approach for sheet metal testing using Digital Image Correlation Daniel J. Cruz a,b, ∗ , Sahand P. Shamchi a,b , Abel D. Santos a,b , Rui L. Amaral b , Paulo J. Tavares b , PMGP Moreira b a Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s / n, 4200-465 Porto, Portugal b INEGI – Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal

1. Introduction 1. Introduction

Uniaxial tensile mechanical tests are widely used to determine the behaviour and the mechanical properties of metallic materials. As they are universally used, they are regulated by di ff erent standard organisations, which define all the conditions needed to get valid results. Accordingly, the specimen geometry is well defined and its dimensions are considered on a macro scale (1). However, in some cases, this type of scale is not the most adequate, e.g., when it is necessary to rigorously study a phase of a biphasic material where the size of the specimens must be in a range close to the grain size; or when it is intended to evaluate the life of a particular mechanical in service component where it is neither possible nor convenient to remove a large amount of material (2); or yet when one needs to perform compression or dynamic fatigue tests on thin sheet metal specimens, where a low ratio thickness to length promotes Uniaxial tensile mechanical tests are widely used to determine the behaviour and the mechanical properties of metallic materials. As they are universally used, they are regulated by di ff erent standard organisations, which define all the conditions needed to get valid results. Accordingly, the specimen geometry is well defined and its dimensions are considered on a macro scale (1). However, in some cases, this type of scale is not the most adequate, e.g., when it is necessary to rigorously study a phase of a biphasic material where the size of the specimens must be in a range close to the grain size; or when it is intended to evaluate the life of a particular mechanical in service component where it is neither possible nor convenient to remove a large amount of material (2); or yet when one needs to perform compression or dynamic fatigue tests on thin sheet metal specimens, where a low ratio thickness to length promotes

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the VCSI1 organizers 10.1016/j.prostr.2020.04.036 ∗ Corresponding author. E-mail address: dcruz@inegi.up.pt 2210-7843 c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review line: Peer-review under responsibility of the VCSI1 organizers. ∗ Corresponding author. E-mail address: dcruz@inegi.up.pt 2210-7843 c 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review line: Peer-review under responsibility of the VCSI1 organizers.