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

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Procedia Structural Integrity 16 (2019) 51–58

© 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. © 201 9 The Authors. Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers Fatigu crack growth models (mostly empirical) are usually constructed using stress intensity factor –  K in linear-elastic fra ture mechanics. Contrary to the kinetic f tigue fracture diagrams (KFFDs) based on  K, K ax new energy diagrams based on strain ene gy d nsity parameter  H,  S* demonstrates o sensitivity to mean stress effect expressed by the stress ratio R. According to th dimensional an lysis approach  H,  S* is replaced by elastic-plastic fracture mechanics parameter based on the energy param ter associat d with  J energy par meter range. Hence, the main oal of this paper is t appli ation of the new averaged strain energy de sity para eter  S* bas d on ysteresis loop curves for cracked components under uniaxi l as well as multiaxial stre s state. The presented approach assumes that th fatigue crack growth increment in the elastic-plastic range is caused by the combination of the maximum value of the energy parameter and its positive part of the range in each cycle of loading. he usefulness and invariance of this parameter have been confirmed in many works. © 201 9 The Authors. 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” Mixed mode (I+II, I+III) fatigue crack growth description in S355/P355NL1 steel Grzegorz Lesiuk a *, Dariusz Rozumek b , J.A.F.O. Correia c , Mi eczysław Szata d , A.M.P. De Jesus c a Faculty of Mechanical Engineering, Department of Mechanics, Materials Science and Engineering, Wrocław University of Science and Technology, Smoluchowskiego 25, 50- 370 Wrocław, Poland b Opole University of Technology, Department of Mechanics and Machine Design, Mikolajczyka 5, 45-271 Opole, Poland c INEGI/Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal d Wroclaw University of Science and Technology, Faculty of Technology and Natural Sciences, S. Batorego 9, PL-59-220 Legnica, Poland Fatigue crack growth models (mostly empirical) are usually constructed using stress intensity factor –  K in linear-elastic fracture mechanics. Contrary to the kinetic fatigue fracture diagrams (KFFDs) based on  K, K max new energy diagrams based on strain energy density parameter  H,  S* demonstrates no sensitivity to mean stress effect expressed by the stress ratio R. According to the dimensional analysis approach  H,  S* is replaced by elastic-plastic fracture mechanics parameter based on the energy parameter associated with  J energy parameter range. Hence, the main goal of this paper is the application of the new averaged strain energy density parameter  S* based on hysteresis loop curves for cracked components under uniaxial as well as multiaxial stress state. The presented approach assumes that the fatigue crack growth increment in the elastic-plastic range is caused by the combination of the maximum value of the energy parameter and its positive part of the range in each cycle of loading. The usefulness and invariance of this parameter have been confirmed in many works. 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” Mixed mode (I+II, I+III) fatigue crack growth description in S355/P355NL1 steel Grzegorz Lesiuk a *, Dariusz Rozumek b , J.A.F.O. Correia c , Mi eczysław Szata d , A.M.P. De Jesus c a Faculty of M chanical Engineeri g, Department of Mechanics, Materials S ie ce and Engineering, Wrocław University of Science and Technolo y, Smoluchowskieg 25, 50- 370 Wrocław, Poland b Opole University of Technology, Department of Mechanics and Machine Design, Mikolajczyka 5, 45-271 Opole, Poland c INEGI/Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal d Wroclaw University of Science and Technology, Faculty of Technology and Natural Sciences, S. Batorego 9, PL-59-220 Legnica, Poland Abstract Abstract Keywords: mild steel; fatigue crack growth; mixed-mode fatigue crack growth; strain energy parameter.

Keywords: mild steel; fatigue crack growth; mixed-mode fatigue crack growth; strain energy parameter.

* Corresponding author. Tel.: +48-71-320-3919; fax: +48-71-321-1235. E-mail address: Grzegorz.Lesiuk@pwr.edu.pl

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 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 * Corresponding author. Tel.: +48-71-320-3919; fax: +48-71-321-1235. E-mail address: Grzegorz.Lesi k@pwr.edu.pl

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.2019.07.021