PSI - Issue 41

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 41 (2022) 518–526

© 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 MedFract2Guest Editors. Abstract Duality of criticality of damage-failure transitions, caused by two intermediate self-similar singular solutions for the stress field at the crack tip (the stress intensity factor criteria) and the blow-up damage localization kinetics, is used for the interpretation of two parameter fracture criteria. Unidirectional composite materials were studied under quasi-static and cyclic loading in the block loading mode with a gradual increase in amplitude. Realization of experimental program analyzing the acoustic emission phase pattern in the stretched composite sample revealed the presence of two attractors (corresponding to two self-similar solutions) responsible for two mechanisms of damage-failure transition related to two-parameter fracture criteria. © 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 MedFract2Guest Editors. Keywords: Polymer composite materials, critical dynamics, damage, acoustic emission, DIC, phase portraits. 1. Introduction The results of recent studies in the field of fracture mechanics of polymer composites of materials correspond to a significant effect on crack resistance (fracture toughness) of such dimensions as geometry, sample thickness and its he 2nd Mediterranean Conference on Fracture and Structural Integrity Acoustic emission phase analysis of damage-failure transition staging in composite materials Mikhail Bannikov a *, Nikolai Sazhenkov b , Aleksandr Balakirev b , Nikolay Sazenkov b , Sergey Uvarov a , Yuri Bayandin a , Аleksandr Nikitiuk a , Mikhail Nikhamkin b , Oleg Naimark a a Institute of Continuous Media Mechanics of Ural branch of RAS, 1, Ac. Koroleva str., Perm 614013, Russian Federation b Perm National Research Polytechnic University, 13 Prof. Pozdeeva St., Perm, 614013, Russian Federation

* Corresponding author. E-mail address: mbannikov@icmm.ru

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 MedFract2Guest 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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.059