PSI - Issue 51

ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 51 (2023) 76–80

© 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 the scientific committee of the ICSID 2022 Organizers Abstract The J-A concept, based on the three-term asymptotic solution for elastic-plastic crack-tip stresses, and the cumulative damage rule are employed to construct the quantitative two-parameter elastic-plastic J-A criterion. The fracture toughness as a function of the crack-tip constraint A in the fracture criterion is interpreted as the corrected elastic-plastic fracture toughness of a specimen with the corresponding constraint parameters A . The results of a study of the normalized corrected fracture toughness as a function of failure stresses, the crack aspect ratio and the strain hardening exponent of the material are presented. The significant effect of the strain hardening exponent on the normalized constraint corrected fracture toughness is observed. © 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 the scientific committee of the ICSID 2022 Organizers Keywords: J-A concept; fracture criterion; constraint corrected fracture toughness 1. Introduction At the present time, it is becoming obvious that in order to assess the structural integrity of real engineering structures with a crack, along with the classical parameters of fracture mechanics (the stress intensity factor, the J integral and etc.) it is necessary to introduce some additional parameters into the basic equations and fracture criteria of fracture mechanics to characterize in-plane and out-of-plane constraints in the vicinity of the crack tip. These parameters are based on the analysis of the stress field in the vicinity of the crack tip. In the case of two parameter elastic-plastic fracture mechanics, higher order solutions were earlier introduced to improve the well-known Hutchinson-Rice-Rosengren (HRR) solution. Excellent description of the crack-tip stress field is demonstrated by the three-term asymptotic expansion ( J-A approach) which was proposed by Nikishkov (1995) and Nikishkov et al. (1995) in the case of small-scale yielding and large-scale yielding. It is noted that the field of elastic-plastic stresses at the 6th International Conference on Structural Integrity and Durability (ICSID 2022) The constraint corrected fracture criterion based on the J-A concept Yu.G. Matvienko a, * a Mechanical Engineering Research Institute of the Russian Academy of Science, 4 Maly Kharitonievsky Pereulok, Moscow 101990, Russia Abstract The J-A concept, based on the three-term asymptotic solution for elastic-plastic crack-tip stresses, and the cumulative damage rule are employed to construct the quantitative two-parameter elastic-plastic J-A criterion. The fracture toughness as a function of the crack-tip constraint A in the fracture criterion is interpreted as the corrected elastic-plastic fracture toughness of a specimen with the corresponding constraint parameters A . The results of a study of the normalized corrected fracture toughness as a function of failure stresses, the crack aspect ratio and the strain hardening exponent of the material are presented. The significant effect of the strain hardening exponent on the normalized constraint corrected fracture toughness is observed. © 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 the scientific committee of the ICSID 2022 Organizers Keywords: J-A concept; fracture criterion; constraint corrected fracture toughness 1. Introduction At the present time, it is becoming obvious that in order to assess the structural integrity of real engineering structures with a crack, along with the classical parameters of fracture mechanics (the stress intensity factor, the J integral and etc.) it is necessary to introduce some additional parameters into the basic equations and fracture criteria of fracture mechanics to characterize in-plane and out-of-plane constraints in the vicinity of the crack tip. These parameters are based on the analysis of the stress field in the vicinity of the crack tip. In the case of two parameter elastic-plastic fracture mechanics, higher order solutions were earlier introduced to improve the well-known Hutchinson-Rice-Rosengren (HRR) solution. Excellent description of the crack-tip stress field is demonstrated by the three-term asymptotic expansion ( J-A approach) which was proposed by Nikishkov (1995) and Nikishkov et al. (1995) in the case of small-scale yielding and large-scale yielding. It is noted that the field of elastic-plastic stresses at the 6th International Conference on Structural Integrity and Durability (ICSID 2022) The constraint corrected fracture criterion based on the J-A concept Yu.G. Matvienko a, * a Mechanical Engineering Research Institute of the Russian Academy of Science, 4 Maly Kharitonievsky Pereulok, Moscow 101990, Russia

* Corresponding author. Tel.: +7-499-135-12-04 E-mail address: ygmatvienko@gmail.com * Corresponding author. Tel.: +7-499-135-12-04 E-mail address: ygmatvienko@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 responsibility of the scientific committee of the ICSID 2022 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 responsibility of the scientific committee of the ICSID 2022 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 responsibility of the scientific committee of the ICSID 2022 Organizers 10.1016/j.prostr.2023.10.070