PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDirec 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 33 (2021) 528–543

IGF26 - 26th International Conference on Fracture and Structural Integrity IGF26 - 26th International Conference on Fracture and Structural Integrity Considerations on the Thermoelastic Effect in proximity of crack tips on Titanium and Aluminium: a new formulation Davide Palumbo a , Rosa De Finis a* , Francesca Di Carolo a , Umberto Galietti a a Department of Mechanics, Mathematics and Management, Politecnico di Bari, Via Orabona 4, 70125, Bari, Italy; Considerations on the Thermoelastic Effect in proximity of crack tips on Titanium and Aluminium: a new formulation Davide Palumbo a , Rosa De Finis a* , Francesca Di Carolo a , Umberto Galietti a a Department of Mechanics, Mathematics and Management, Politecnico di Bari, Via Orabona 4, 70125, Bari, Italy;

© 2021 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 scientific committee of the IGF ExCo Abstract Thermoelastic Stress Analysis (TSA) is an experimental technique used for describing the stress state and the mechanical behaviour of materials subjected to linear-elastic deformations. The classic TSA theory consists of a simple relation between temperature and stress variations and was successfully applied in fracture mechanics for SIF and crack tip evaluation. This theory for some materials, such as titanium and aluminium, is no longer valid since the mechanical properties of the material cannot be neglected. The research framework lies in the field of the validity hypothesis of thermoelastic stress analysis, in this regard, the aim of this work is to present a new thermoelastic formulation that includes the second-order effects to investigate the thermoelastic effect in the proximity of crack tips, on Titanium and Aluminium. Moreover, error analysis has been carried out for investigating the differences between the proposed approach and the classical one. © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Thermoelastic Stress Analysis (TSA); Stress Intensity Factor (SIF); Titanium; Aluminium; mode I. 1. Introduction The study and evaluation of the stress state in the proximity of the crack tip represents an important topic in many fields of engineering. In this regard, the Stress Intensity Factor (SIF) evaluation represents the main TSA application since the SIF together with the crack growth rate, provides important information on the fatigue behaviour of the material. SIF can be assessed by employing TSA (Thermoelastic Stress Analysis) Stanley, (1997), Lesniak et al (1997),Tomlinson et al (1997), Tomlinson et al (1999), Dulieu-Barton et al (2003),Diaz et al (2004),He and Rowlands ______________________ * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: ros .definis@poliba.it Abstract Thermoelastic Stress Analysis (TSA) is an experimental technique used for describing the stress state and the mechanical behaviour f materials ubjected to linear-elastic defor ations. T e classic TSA th ory consists of a impl relation betwee temp r ture and stress v riations an was successfully applied in fractur mechanics for SIF and crack tip evaluation. Th s theory for so e materi ls, such as titan um aluminium, is no long r valid sinc th mechanical properties of the m terial cannot b neglected. The research framework lies in the field of the validity hypothesis of thermoelastic stress analysis, in this regard, the aim of this work is to present a new thermo lastic formul tion t at includes the second-orde effects to investigate the thermoelastic effect in the proximity of crack tips, on Titaniu and Aluminium. Moreover, error analysis has been carried out for investigating the differences between the proposed approach and the classical one. © 2021 Th Authors. Published by ELSEVIER B.V. This is an open access article und r the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc nd/4.0)Peer-review Statement: Peer-r view under responsibi ty of the scientific committee of the IGF ExCo Keywords: Th rmo lastic tress Analysis (TSA); Stress Intensity Factor (SIF); Titanium; Aluminiu ; mode I. 1. Introduction The study and evaluation of the stress state in the proximity of the crack tip represents an important topic in many fields of ngineeri g. In this regard, the Stre s Inte sity Factor (SIF) evalu tion repres nts he main TSA ap li ation since the SIF tog ther with the crack growth rate, provides important information on th fa igue behaviour of the material. SIF can be assessed by employing TSA (The moelastic Stress Analysis) Sta ley, (1997), L sniak et al (1997),Tomlinson et al (1997), Tomlinson et al (1999), Duli u-Barton et al (2003),Diaz et al (2004),He and Rowl nds ______________________ * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: rosa.definis@poliba.it

2452-3216 © 2021 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 scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.059 2452-3216 © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article nder the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committe of the IGF ExCo