PSI - Issue 23

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

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Procedia Structural Integrity 23 (2019) 69–76

9th International Conference on Materials Structure and Micromechanics of Fracture Recent progress in the application of multiaxial fatigue criteria to 9th International Conference on Materials Structure and Micromechanics of Fracture Recent progress in the application of multiaxial fatigue criteria to

lifetime calculations A. Karolczuk a *, J. Papuga b a Opole Univeristy of Technology, ul. Mikołajczyka 5, 45-271 Opole, Poland b Czech Technical University in Prague, Technická 4, 166 07, Prague 6, Czech Republic lifetime calculations A. Karolczuk a *, J. Papuga b a Opole Univeristy of Technology ul. Mikołajczyka 5, 45-271 Opole, Poland b Czech Technical University in Prague, Technická 4, 166 07, Prague 6, Czech Republic

Abstract Abstract

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. This paper pres nts the concept of life-dep ndent material parameters applied to multiaxial fatigue damage models. Every multi xial fatigue limi criter on based on th history of the stress tensor components is defined by a s al parameter that is compared with the fatigue limit. The defined damage parameter is usually lso a function of some character stic material parameters. These mate ial parameters ar usually derived from fatigue limits obtained under uniaxial and torsi loading. Attempts o extend this cl ssic form of the damage parameter beyond the fatigue limit domain, i.e. to lifetim calculations, fail even within t e high cycl fatigue do ain. The aim of this p per is to demonstrate that the mater al parameters d ved f o fatigue limits should not be applied in multiaxial fatigue criteria for lifetime calculations. A d finition of these mate ial pa ameters based n applyin fatigue uniaxial and torsion characteristics instead of fatigu limi s implies that the resulting param ters are functions of the fatigue life. Apply ng a life-dependent material parameter to the Matake multiaxial fatigue criterion leads to a remarkable improvement in the fatigue life prediction for 2124-T851 aluminium alloy. © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. This paper presents the concept of life-dependent material parameters applied to multiaxial fatigue damage models. Every multiaxial fatigue limit criterion based on the history of the stress tensor components is defined by a scalar parameter that is compared with the fatigue limit. The defined damage parameter is usually also a function of some characteristic material parameters. These material parameters are usually derived from fatigue limits obtained under uniaxial and torsion loading. Attempts to extend this classic form of the damage parameter beyond the fatigue limit domain, i.e. to lifetime calculations, fail even within the high cycle fatigue domain. The aim of this paper is to demonstrate that the material parameters derived from fatigue limits should not be applied in multiaxial fatigue criteria for lifetime calculations. A definition of these material parameters based on applying fatigue uniaxial and torsion characteristics instead of fatigue limits implies that the resulting parameters are functions of the fatigue life. Applying a life-dependent material parameter to the Matake multiaxial fatigue criterion leads to a remarkable improvement in the fatigue life prediction for 2124-T851 aluminium alloy.

Keywords: Multiaxial fatigue criteria; 2124-T851 aluminium alloy; fatigue life prediction Keywords: Multiaxial fatigue criteria; 2124-T851 aluminium alloy; fatigue life prediction

1. Introduction Fatigue as a material failure mechanism of is one of the primary causes of damage to structural components, Gagg & Lewis (2009) and is the reason for many catastrophic disasters, Findlay & Harrison (2002). 1. Introduction Fatigue as a material failure mechanism of is one of the primary causes of damage to structural components, Gagg & Lewis (2009) and is the reason for many catastrophic disasters, Findlay & Harrison (2002).

* Corresponding author. Tel.: +48 77 4498403. E-mail address: a.karolczuk@po.opole.pl * Correspon ing autho . Tel.: +48 77 4498403. E-mail address: a.karolczuk@po.opole.pl

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.065