PSI - Issue 47

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 47 (2023) 685–692

© 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 IGF27 chairpersons Abstract The duality of criticality of damage-failure transitions, caused by two intermediate self-similar singular solutions for the stress field at the crack tip (known as the stress intensity factor criteria) and the blow-up damage localization kinetics, is utilized to interpret two-parameter fracture criteria. Quasi-static and cyclic loading were applied to unidirectional and woven with concentrator composite materials. The experimental program includes the acoustic emission phase pattern and digital image correlation analysis in the stretched composite sample and 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. © 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 IGF27 chairpersons Keywords: Polymer composite materials, critical dynamics, damage, acoustic emission, DIC, phase portraits. 1. Introduction Recent studies in fracture mechanics of polymer composites show that factors such as geometry, sample thickness, loading pattern, size, and type of crack-like defect significantly affect the crack resistance. However, a problem arises in transferring experimental results of crack resistance from samples to machine and structural 27th International Conference on Fracture and Structural Integrity (IGF27) Damage-failure transition staging in carbon fiber composite materials under quasistatic and cyclic loading with acoustic and digital image correlation analysis Mikhail Bannikov*,Sergey Uvarov a , Yuri Bayandin a , А leksandr Nikitiuk a , Oleg Naimark a Institute of Continuous Media Mechanics of Ural branch of RAS, 1, Ac. Koroleva str., Perm 614013, Russian Federation

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

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 IGF27 chairpersons

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 IGF27 chairpersons 10.1016/j.prostr.2023.07.052