PSI - Issue 54

Available online at www.sciencedirect.com

ScienceDirect

Available online at www.sciencedirect.com

Structural Integrity Procedia 00 (2023) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 54 (2024) 314–321

International Conference on Structural Integrity 2023 (ICSI 2023)

Investigation on geometric imperfections of tensile test specimens using optical full-field measurements and digital twin-based simulations

T.Fekete a, *, D. Antók a , L. Tatár a , P. Bereczki b

a HUN-REN Centre for Energy Research, Konkoly-Thege M. str. 29-33., Budapest H-1121, Hungary b University of Dunaújváros, Táncsics Mihály str. 1/A, Dunaújváros H-2400, Hungary

Abstract

© 2023 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 the scientific committee of the ICSI 2023 organizers Standard-based evaluations of tensile tests assume ideal geometry and homogeneous, isotropic material. Based on the Digital Twin concept, a measurement and evaluation system has been built in recent years allowing the monitoring of tensile tests with a fine temporal resolution and full spatial data acquisition technology that provides significantly more detailed data than conventional measurement techniques. This paper investigates whether the theoretical model used in Digital Twin can capture differences between the realistic initial geometry of a specimen and its idealised model. High-precision machining of samples, combined with highly accurate coordinate measurements, results in a fine resolution coordinate map. The geometric imperfections of the finished samples are well within the allowed manufacturing tolerances. Digital Twins of the test specimens were built using two approaches. First, the initial geometry of the specimen's active zone was idealised. For the second, the shape of the test specimen was defined by the best fitting surfaces to the observed results. Simulation results show that computations, based on realistic initial geometry, i.e., considering geometric imperfections inherent in the initial geometry, are much more accurate in tracking time evolution of the specimen geometry –including necking zone location– than computations based on idealised geometry. © 2023 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 the scientific committee of the ICSI 2023 organizers Keywords: Digital Twin; Finite Element; Tensile Test; Optically Assisted Measurement

* Corresponding author. Tel.: +36 1 392 2222/3403 E-mail address: fekete.tamas@ek.hun-ren.hu

2452-3216 © 2023 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 the scientific committee of the ICSI 2023 organizers

2452-3216 © 2023 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 the scientific committee of the ICSI 2023 organizers 10.1016/j.prostr.2024.01.089