PSI - Issue 16

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 16 (2019) 211–217

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers chanics approach for notched structural components fatigue life was analyzed usin a unified model of fatigue fracture. It was s own that the fatigue macrocrack initiati n peri which determines mainly the durability of high-loade structural elements made of high-strength materials can be predicted by the proposed base notch fatigue curv at the macrocrack initiation stage. Th possibility of the process monitoring of microdamage accumulation, microcrack network formation and macrocrack initiation using acoustic emission (AE) monitoring non-destructively was demonstrated. It was established that the AE energy parameter EWT increased from 0.01 to 0.18 during the process for notched specimens made of D16pchAT aluminum alloy (type 2024-T3). © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” The methodology of evaluation and monitoring of the fatigue fracture at macrocrack initiation stage Roman Chepil, Olena Stankevych, Orest Ostash*, Bohdan Klym Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5, Naukova St., Lviv 79060, Ukraine 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” The methodology of evaluation and mon toring of the fatigue fracture at macrocrack initiation stage Roman Chepil, Olena Stankevych, Orest Ostash*, Bohdan Klym Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5, Naukova St., Lviv 79060, Ukraine Abstract The fracture mechanics approach for notched structural components fatigue life was analyzed using a unified model of fatigue fracture. It was shown that the fatigue macrocrack initiation period which determines mainly the durability of high-loaded structural elements made of high-strength materials can be predicted by the proposed base notch fatigue curve at the macrocrack initiation stage. The possibility of the process monitoring of microdamage accumulation, microcrack network formation and macrocrack initiation using acoustic emission (AE) monitoring non-destructively was demonstrated. It was established that the AE energy parameter EWT increased from 0.01 to 0.18 during the process for notched specimens made of D16pchAT aluminum alloy (type 2024-T3). The fracture Keywords: Fatigue; macrocrack initiation; durability; monitoring; acoustic emission 1. Introduction The ensuring of mechanical systems integrity and prediction of structural components fatigue life N f are the important problems of engineering practice, especially for components with geometrical stress concentrators (holes, cuts, fillets, etc.). In this case, the fracture is stipulated by the local maximum stress, significantly higher than the 1. Introduction The ensuring of mechanical systems integrity and prediction of structural components fatigue life N f are t e important problems of engineering practice, especially for components with geometrical stress concentrators (holes, cuts, fillets, etc.). In this case, the fracture is stipulated by the local maximum stress, significantly higher than the Abstr t Keywords: Fatigue; macrocrack initiation; durability; monitoring; acoustic emission

* Corresponding author. Tel.: +380-32-263-5100; fax: +380-32-264-94-27. E-mail address: fmidep17@gmail.com

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers * Corresponding author. Tel.: +380-32-263-5100; fax: +380-32-264-94-27. E-mail address: fmidep17@gmail.com

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. 10.1016/j.prostr.2019.07.043