PSI - Issue 43

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Procedia Structural Integrity 43 (2023) 35–40

© 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 the responsibility of MSMF10 organizers. A simple principle for determining fracture toughness (FT) of ductile materials by ball indentation (BI) technique is suggested here. The principle is based on the consideration that the total fracture energy of a material is equivalent to the indentation energy corresponding to a critical plastic strain (CPS); the latter can be estimated from the true fracture strain in tensile test and stress triaxiality ratio in tensile and BI test. Fracture toughness values of 304LN stainless, 316LN stainless, interstitial free (IF), 0.14% C and SA333 steels have been determined by the modified BI technique as well as by standard J-integral test for two steels. A comparative assessment indicates that the equivalent FT values determined by the suggested BI technique is within 5% of the estimated or reported values of J-integral FT of the materials, and thus validates the consideration behind the principle of the suggested BI technique. © 1 9 The Authors. Published by Elsevier B.V. Th i an open access article under the CC BY-NC-ND license (http://creativec mmons.org/licenses/by-nc-nd/4.0/) eer-review under the responsibility of MSMF10 organizers. Keywords: Ball Indentation; Indentation Fracture Toughness; J-integral Fracture Toughness; Indentation Energy to Fracture; Stress Triaxiality; Critical Fracture Strain. 1. Introduction Determination of fracture toughness (FT) of metallic materials is commonly done using several standard methods (ASTM E399-09, ASTM E1820-11). The standard procedures for estimating FT require specific specimen size and geometry, pre-cracking of specimens, and recording load versus crack tip opening displacement followed by detailed analysis. The methods are inherently destructive in nature, relatively complex and cannot be applied to 1 PMI Service Center Europe Sp. z o.o., Krakow-31-982, Poland; earlier with Dept. Met. and Mater. Engg., IIT Kharagpur, India -721302 2 Valeo Autoklimatizace k.s.Sazeˇcsk´a 247/2, 108 00 Prague , Czech Republic; earlier with Dept. Physics, IIT Kharagpur, India-721302 3 Department of Metallurgical and Materials Engineering, IIT Kharagpur, India -721302 (*corresponding authors ) Abstract A simple principle for determining fracture toughness (FT) of ductile materials by ball indentation (BI) technique is suggested here. The principle is based on the consideration that the total fracture energy of a material is equivalent to the indentation energy corresponding to a critical plastic strain (CPS); the latter can be estimated from the true fracture strain in tensile test and stress triaxiality ratio in tensile and BI test. Fracture toughness values of 304LN stainless, 316LN stainless, interstitial free (IF), 0.14% C and SA333 steels have been determined by the modified BI technique as well as by standard J-integral test for two steels. A comparative assessment indicates that the equivalent FT values determined by the suggested BI technique is within 5% of the estimated or reported values of J-integral FT of the materials, and thus validates the consideration behind the principle of the suggested BI technique. © 201 9 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 the responsibility of MSMF10 organizers. Keywords: Ball Indentation; Indentation Fracture Toughness; J-integral Fracture Toughness; Indentation Energy to Fracture; Stress Triaxiality; Critical Fracture Strain. 1. Introduction Determination of fracture toughness (FT) of metallic materials is commonly done using several standard methods (ASTM E399-09, ASTM E1820-11). The standard procedures for estimating FT require specific specimen size and geometry, pre-cracking of specimens, and recording load versus crack tip opening displacement followed by detailed analysis. The methods are inherently destructive in nature, relatively complex and cannot be applied to 10th International Conference on Materials Structure and Micromechanics of Fracture A Simple Principle for Fracture Toughness Assessment of Ductile Materials by Ball Indentation Technique Arnab Bhattacharyya 1 , Ayan Ray 2* and Kalyan Kumar Ray 3 1 PMI Service Center Europe Sp. z o.o., Krakow-31-982, Poland; earlier with Dept. Met. and Mater. Engg., IIT Kharagpur, India -721302 2 Valeo Autoklimatizace k.s.Sazeˇcsk´a 247/2, 108 00 Prague , Czech Republic; earlier with Dept. Physics, IIT Kharagpur, India-721302 3 Department of Metallurgical and Materials Engineering, IIT Kharagpur, India -721302 (*corresponding authors ) Abstract 10th International Conference on aterials Structure and icromechanics of Fracture Si ple Principle for Fracture oughness ssess ent of uctile aterials by all Indentation echnique Arnab Bhattacharyya 1 , Ayan Ray 2* and Kalyan Kumar Ray 3

* Corresponding author. Tel.: +91-9434230710 E-mail address: arnab.ju@gmail.com * Corresponding author. Tel.: +91-9434230710 E-mail address: arnab.ju@gmail.com

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 the responsibility of MSMF10 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 the responsibility of MSMF10 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 the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.231