PSI - Issue 81

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ScienceDirect

Procedia Structural Integrity 81 (2026) 260–263

© 2026 The Authors. Copy from the contract: 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 DMDP 2025 organizers Keywords: damages; material structure; durability; fatigue; hard facing; non-destructive testing The fatigue test results were processed in accordance with the hypothesis of a pole in the fatigue curves of materials of the same class with different technological heredity. For this purpose, the coordinates of the fatigue curve poles for the investigated materials were determined. It has been established that the ordinates of the poles of the fatigue curves correspond to the activation energy of destruction of the volume of one mole of the metal that forms the basis of the alloy. The abscissas of the poles for different classes of steel were determined by searching for optimal values of the main statistical parameters (the maximum correlation coefficient with minimum standard deviation). An explicit connection between the abscissa of the pole and the mechanical and physical properties of the alloys under study has not been established. 1. Introduction The existing imperfection of modern methods for assessing the technical condition of structures and their remaining life is due to a number of factors. On the one hand, there is the complexity of the fatigue process, which occurs in most practical cases, and on the other hand, there is a lack of reliable methods for monitoring the level of damage to product materials under real operating conditions. It remains very problematic to take into account the action of spatial internal elastic forces, which are a consequence of previous thermal and mechanical effects McEvily (2013); Pisarenko et al. (2014); Yasniy et al. (2020); Chiocca et al. (2022). Elucidating the nature of material strengthening is such a difficult task to solve that it is not yet possible to propose a specific and convincing quantitative theory of this issue. In recent years, a large number of works have been published devoted to individual issues of strengthening parts by surface plastic deformation, but significant progress towards the creation of a complete strengthening theory has not yet occurred. One of the reasons for this situation is the insufficient attention paid to the study of the influence of individual strengthening factors on the kinetics of material fracture, as well as the analysis of parameters that adequately characterize the surface stress state. Most of the recent research in the field of strengthening is devoted to solving partial issues VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Prediction of Material Damages Based on a High-Cycle Fatigue Model and Non-destructive Testing Data Bezhenov Sergiy* National University Zaporizhzhia Polytechnic, Zhukovsky str., 64, Zaporizhzhya, 69063, Ukraine Abstract In this paper, the results of the investigation of the process of fatigue fracture of the carbon steels, low-alloy steels, Ni-based, as well as Ti-based alloy specimens are presented. Samples were studied in a state of normalization of the material structure, as well as after strengthening treatment by surface plastic deformation. During the fatigue tests, the count rate of acoustic emission (AE) signals was recorded simultaneously in three frequency bands.

* Corresponding author. Tel.: +38-067-525-9714. E-mail address: bezhenov@zp.edu.ua

2452-3216 © 2026 The Authors. Copy from the contract: 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 DMDP 2025 organizers 10.1016/j.prostr.2026.03.045