PSI - Issue 36

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 36 (2022) 190–196

1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Prediction of residual durability of structural elements with identical surface cracks taking into account the stage of their coalescence Ivan Pidgurskyi a *, Mykola Stashkiv a , Mykola Pidgurskyi a , Yurii Rudyak b , la a b

Yevgen Ripetskyi c , Roman Ripetskyi c , Valeriy Lazaryuk a a Ternopil Ivan Pului National Technical University, 56 Ruska St., Ternopil 46001, Ukraine b I. Horbachevsky Ternopil National Medical University, 1 Maidan Voli, Ternopil 46001, Ukraine c Karpenko Physiko-Mechanical Institute of the NAS of Ukraine, 5 Naukova St, Lviv 79060, Ukraine yi c , Roman Ripetskyi c , Valeriy Lazaryuk a

© 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 A method for predicting the residual durability of structural elements during the coalescence of identical coplanar surface cracks is proposed. The technique is based on a substantiated geometric model of crack development kinetics in the coalescence process, which is divided into a series of contours, and on a regression equation, which functionally describes the change of coalescence factor γ coal in the coalescence process. The coalescence factor γ coal depends on the geometric parameters of the crack shape and the geometry of the coalescence zone, which changes under the cyclic loading. The influence of crack shape parameters on plate durability during the coalescence stage is analyzed. It is determined that reasonable consideration of crack growth in the coalescence zone increases the estimated durability by up to 25% compared to existing calculation methods, norms and standards. © 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: surface cracks, shape factor, coalescence process, fatigue crack growth life. 1. Introduction Improving the reliability and durability of machines and structures is one of the most important scientific and technical problems. This is especially true for cyclically loaded objects (Rybak et al. (2019)), where cracks

* Corresponding author. Tel.: +38 (066) 837 27 31; E-mail address: ipidhurskyy@gmail.com

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 T

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.2022.01.023