PSI - Issue 52

ScienceDirect Structural Integrity Procedia 00 (2023) 151 – 158 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 151 – 158 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 52 (2024) 472–479

© 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 Professor Ferri Aliabadi © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativeco mmons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Professor Ferri Aliabadi Keywords: Fracture; Toughness; J IC ; K JC ; Plane Strain; Plane Stress; Constraint; Charpy; Pre-Crack; SEN(B); Bending; ABAQUS; Steel; SA508; Thickness; Smple Size; Potential Difference Test sample thickness is often limited by availability of parent material and capacity of test equipment. Small scale samples offer convenience in laboratory testing. However, it is expected that smaller samples will experience reduced constraint in out-of-plane strain and deviate from ideal responses for plane strain or plane stress. Reducing sample size often promotes ductile fracture and increases fracture toughness. This can make assessment of fracture toughness invalid when conveniently sized samples are used. In this work, SEN(B) fracture tests were performed on 10 mm pre-cracked Charpy sized samples, made from SA508 grade 3 class 1 steel. Samples were fractured at room temperature. Load and displacement profiles were recorded to assess loading profile by bending stress and J-integral. Potential drop across the fracture surface was also recorded, with a constant current supply, to monitor crack growth and enabled the critical fracture properties ( K IC and J IC ) to be identified. Results were compared to previously tested 25 mm SEN(B)’s, which the 10 mm samples were extracted. This system highlights the validity of fracture toughness testing with varying sized specimens. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativeco mmons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Professor Ferri Aliabadi Keywords: Fracture; Toughness; J IC ; K JC ; Plane Strain; Plane Stress; Constraint; Charpy; Pre-Crack; SEN(B); Bending; ABAQUS; Steel; SA508; Thickness; Smple Size; Potential Difference Fracture, Damage and Structural Health Monitoring Quantifying The Influence of SEN(B) Sample Thickness and Constraint on The Fracture Toughness of Pressure Vessel Steel SA508 Ben M B Sargeant a *, Paul A Hooper a and Catrin M Davies a a Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK Test sample thickness is often limited by availability of parent material and capacity of test equipment. Small scale samples offer convenience in laboratory testing. However, it is expected that smaller samples will experience reduced constraint in out-of-plane strain and deviate from ideal responses for plane strain or plane stress. Reducing sample size often promotes ductile fracture and increases fracture toughness. This can make assessment of fracture toughness invalid when conveniently sized samples are used. In this work, SEN(B) fracture tests were performed on 10 mm pre-cracked Charpy sized samples, made from SA508 grade 3 class 1 steel. Samples were fractured at room temperature. Load and displacement profiles were recorded to assess loading profile by bending stress and J-integral. Potential drop across the fracture surface was also recorded, with a constant current supply, to monitor crack growth and enabled the critical fracture properties ( K IC and J IC ) to be identified. Results were compared to previously tested 25 mm SEN(B)’s, which the 10 mm samples were extracted. This system highlights the validity of fracture toughness testing with varying sized specimens. Fracture, Damage and Structural Health Monitoring Quantifying The Influence of SEN(B) Sample Thickness and Constraint on The Fracture Toughness of Pressure Vessel Steel SA508 Ben M B Sargeant a *, Paul A Hooper a and Catrin M Davies a a Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK Abstract Abstract

* Corresponding author. Tel.: +44 20 7589 5111. E-mail address: b.sargeant22@imperial.ac.uk

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 Professor Ferri Aliabadi 10.1016/j.prostr.2023.12.047 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativeco mmons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Professor Ferri Aliabadi 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativeco mmons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Professor Ferri Aliabadi * Corresponding author. Tel.: +44 20 7589 5111. E-mail address: b.sargeant22@imperial.ac.uk