PSI - Issue 37

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

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ScienceDirect

Procedia Structural Integrity 37 (2022) 826–832

© 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 Thus, this work reports the development of a custom control system for an SHPB, not only to ensure good repeatability in the firing mechanism, but also to synchronize the data acquisition, namely the acquired voltage signals with the high-speed image acquisition for use with Digital Image Correlation (DIC). The developed system was already implemented, being capable of successfully controlling the trigger pressure through a computer user interface. © 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: Machine control; Material testing; High strain rate testing Abstract In order to ensure the necessary usage safety in structures that withstand extreme loading conditions, it is necessary to perform high-strain rate tests for the used materials, in order to be able to predict their behaviour. A common apparatus for these tests is the Split Hopkinson Pressure Bar (SHPB). This type of test is currently performed in the Advanced Monitoring and Structural Integrity unit of INEGI with a custom-built pneumatic setup, comprising two compression and two tension bars. Originally, these bars were manually controlled using a couple of buttons and a pressure gauge and thus the system was somewhat more prone to user error and required manual synchronization of the multiple acquisition systems. ICSI 2021 The 4th International Conference on Structural Integrity Custom control system for Split Hopkinson Pressure bars Pedro J. Sousa a* , Rogério Lopes a , Jorge M. Reis b , 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 b Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal

* 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 under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.015