PSI - Issue 60

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Procedia Structural Integrity 60 (2024) 203–213

© 2024 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 ICONS 2023 Organizers Abstract The present work deals with the characterization of ductile tearing resistance of 1 mm thick interstitial free steel sheet using crack tip opening angle ( ), and δ 5 concepts with some experimental modification. CTOA ( ) measurements on the specimen surface at the growing crack tip have been performed using light microscope on both pre-cracked DENT and SENT specimens at three ramp rates following the essence of ASTM E 2472. In order to determine the effect of pre-cracking, CTOA of the notched ( :0.1 ) SENT specimen has also been measured at 10 -4 s -1 . The transferability of − ∆ and δ 5 − ∆ between two geometries has been verified. It is concluded that for a specified thickness both − ∆ and δ 5 − ∆ plots can be used for crack growth characterisation of sheet metals even without using pre-cracked specimens. However, the angle ( 5 ) determined from δ 5 − ∆ curve is not the true measure of optical CTOA, as the 5 gauge position does not follow the tip position of the growing crack. © 2024 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 ICONS 2023 Organizers Keywords: Interstitial-free (IF) steel; Crack tip opening angle (CTOA); δ 5 ; SENT; DENT 1. Introduction Fracture Toughness parameters serve as the basis for material qualification as well as structural integrity assessment of the components under static and dynamic loading conditions. The existing literatures encompass around standardization of fracture toughness parameters for thick plates, pertaining to Plain Strain or Quasi Plain Strain conditions. Eventually, the parameters; stress intensity factor ( ), critical integral ( ) and critical crack tip opening displacement ( ) were introduced to characterize crack initiation in thick plates and have been standardized (Zhu and Joice, 2012). However, their applicability in thin sheet (Plane Stress or Quasi Plane Stress condition at the crack tip) * Corresponding author. Tel.: +0-983-023-6451. E-mail address: pc.chakraborti@jadavpuruniversity.in 2452-3216© 2024 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 ICONS 2023 Organizers Abstract The present work deals with the characterization of ductile tearing resistance of 1 mm thick interstitial free steel sheet using crack tip opening angle ( ), and δ 5 concepts with some experimental modification. CTOA ( ) measurements on the specimen surface at the growing crack tip have been performed using light microscope on both pre-cracked DENT and SENT specimens at three ramp rates following the essence of ASTM E 2472. In order to determine the effect of pre-cracking, CTOA of the notched ( :0.1 ) SENT specimen has also been measured at 10 -4 s -1 . The transferability of − ∆ and δ 5 − ∆ between two geometries has been verified. It is concluded that for a specified thickness both − ∆ and δ 5 − ∆ plots can be used for crack growth characterisation of sheet metals even without using pre-cracked specimens. However, the angle ( 5 ) determined from δ 5 − ∆ curve is not the true measure of optical CTOA, as the 5 gauge position does not follow the tip position of the growing crack. © 2024 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 ICONS 2023 Organizers Keywords: Interstitial-free (IF) steel; Crack tip opening angle (CTOA); δ 5 ; SENT; DENT 1. Introduction Fracture Toughness parameters serve as the basis for material qualification as well as structural integrity assessment of the components under static and dynamic loading conditions. The existing literatures encompass around standardization of fracture toughness parameters for thick plates, pertaining to Plain Strain or Quasi Plain Strain conditions. Eventually, the parameters; stress intensity factor ( ), critical integral ( ) and critical crack tip opening displacement ( ) were introduced to characterize crack initiation in thick plates and have been standardized (Zhu and Joice, 2012). However, their applicability in thin sheet (Plane Stress or Quasi Plane Stress condition at the crack tip) * Corresponding author. Tel.: +0-983-023-6451. E-mail address: pc.chakraborti@jadavpuruniversity.in 2452-3216© 2024 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 ICONS 2023 Organizers Third International Conference on Structural Integrity 2023 (ICONS 2023) Determination of Ductile Tearing Resistance parameter of Interstitial-Free Steel Sheet * S.K. Chandra a , P.S. De b , P.C. Chakraborti a* Third International Conference on Structural Integrity 2023 (ICONS 2023) Determination of Ductile Tearing Resistance parameter of Interstitial-Free Steel Sheet * S.K. Chandra a , P.S. De b , P.C. Chakraborti a* a Metallurgical and Material Engineering Department, Jadavpur University, Kolkata 700032, India b Department of Engineering Design, Indian Institute of Technology, Madras 600036, India * Corresponding Author a Metallurgical and Material Engineering Department, Jadavpur University, Kolkata 700032, India b Department of Engineering Design, Indian Institute of Technology, Madras 600036, India * Corresponding Author

2452-3216 © 2024 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 ICONS 2023 Organizers 10.1016/j.prostr.2024.05.042