PSI - Issue 36

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 36 (2022) 277–283

© 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 the conference Guest Editors Abstract The paper considers the method of instrumented indentation to evaluate the strength of high-strength steel sheets as one of the fastest and more accurate methods of nondestructive testing. Many different types of tests are used to determine the strength characteristics of metals. Tensile and hardness tests are the most common. Tensile tests are labor and energy-intensive, whereas hardness tests are less accurate compared to the instrumented indentation. The advantage of the instrumented indentation method as compared to the standard hardness measurement method lies in the following: the possibility to directly register the entire process of continuous local deformation of the material using the indenter, high speed and simplicity due to the process automation, as well as no visual measurement of the indentation imprint diameter. In addition, the correlation relationships for determining the strength characteristics of the indentation diagram parameters are valid for a wide class of materials. The authors use different methods, namely, uniaxial tension tests, Brinell hardness tests and instrumented indentation method, comparative analysis of the strength characteristics of 28GKhNMR and 20GR sheet steels with the thickness of 10 mm, and 30Kh2CN2MFA and 28GR steels with the thickness of 6 mm for special structures production to confirm the efficiency of the instrumented indentation test method. To assess the accuracy of the determination of strength characteristics by the method of instrumented indentation, the authors employed the procedure to determine the strength of high-strength steels via the Brinell hardness. As a result, deviations of certain strength characteristics Rp0.2 and Rm of the studied steels, as compared with the corresponding strength characteristics in uniaxial tension, do not exceed 10.4%. At the same time, deviations of strength characteristics obtained by the instrumented indentation method from the tensile strength characteristics do not exceed 5.2%. © 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 the conference Guest Editors Keywords: instrumented indentation method, high-strength steels, hardness, yield limit, strength limit. 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Determination of strength characteristics of high-strength sheet steels by hardness and instrumented indentation V. Kharchenko, O. Katok, A. Sereda*, M. Rudnitskyi, R. Kravchuk, S. Bisyk G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine, Kyiv 01014, Ukraine Central Scientific Research Institute of Armament and Military Equipment of the Armed Forces of Ukraine, Kyiv, Ukraine Abstract The paper considers the method of instrumented indentation to evaluate the strength of high-strength steel sheets as one of the fastest and more accurate t s of nondestructive testing. Many diff rent types of tests are used to determine the strength characteristics of metals. Tensile and hardn s tests are the most common. Tensil tests are l bor an energy-intensiv , whereas hardness test are l ss accurate compared to the in trumented indentation. Th advantage of the instrumented i d tation m thod as compared to th t nda d hardness measurement tho lies in the following: he p ssibility to directly register the ntire process of continuous local deformation of the material us ng the indenter, high s eed and simplicity due to the process automati n, as well a n visual me suremen of the indentation impri t diameter. In additio , the correlation relationships for determini g the strength characteristics of the indentation di gram parameters are valid for a wide class of materia s. The auth rs us different methods, namely, uniaxial tensio tests, Brinell hardness t sts nd instrumented indentation m thod, comparative analysis of the s rength characteristics of 28GKhNMR and 20GR sh et steels with the thickness of 10 mm, and 30Kh2CN2MFA d 28GR st els wit t e thickness f 6 mm for special structures production to confirm the efficiency of the instrumented i entation st method. To assess the accuracy of the determination of strength characteristics by th method of i str t i t ti , the au rs employ d t procedure to d termine the strength of high-st ength steels via the Brinell hardness. As a result, deviations of certain str ngt characte istics Rp0.2 and Rm of t e studied st els, as comp red with the corresponding strength ch racteristi s in uniaxial ension, do not exceed 10.4%. At the same tim , deviations of strength characteristics obtained by the instrumented indentation method from the t nsile strength characteristics do not exceed 5.2%. © 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 t conference Guest Editors Keywords: instrumented indentation method, high-strength steels, hardness, yield limit, strength limit. 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Determination of strength characteristics of high-strength sheet steels by hardness and instrumented indentation V. Kharchenko, O. Katok, A. Sereda*, M. Rudnitskyi, R. Kravchuk, S. Bisyk G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine, Kyiv 01014, Ukraine Central Scientific Research Institute of Armament and Military Equipment of the Armed Forces of Ukraine, Kyiv, Ukraine

* Corresponding author. Tel.: +38-044-285-1687; fax: +38-044-286-1684. E-mail address: sereda@ipp.kiev.ua * Corresponding author. Tel.: +38-044-285-1687; fax: +38-044-286-1684. E-mail address: sereda@ipp.kiev.ua

2452-3216 © 2022 A.V. Sereda et al. 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 conference Guest Editors 2452-3216 © 2022 A.V. Sereda et al. 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 conference Guest Editors

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 the conference Guest Editors 10.1016/j.prostr.2022.01.035