PSI - Issue 37

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ScienceDirect il l li t . i i t.

www.elsevier.com/locate/procedia . l i r. /l t / r i

ScienceDirect

Procedia Structural Integrity 37 (2022) 964–976

© 2022 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 Pedro Miguel Guimaraes Pires Moreira Abstract In this work a new methodology for characterising the fatigue crack propagation of metallic alloys is proposed. The methodology is based on the plastic component of the Crack Tip Opening Displacement (CTOD p ) as a driving force. This CTOD p parameter is evaluated from full-field displacement maps obtained by Digital Image Correlation (DIC). The method is applied on austenitic stainless steel but appears to be very suitable to a wide range of metal alloys. The methodology appears to improve some of the issues related to Linear Elastic Fracture Mechanics predictions for fatigue crack growth. © 2022 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 Pedro Miguel Guimaraes Pires Moreira Keywords: Fatigue crack growth; Digital Image Correlation; CTOD; Austenitic stainless steel 1. Introduction Designing a damage tolerant component against fatigue is the dream of every designer. The damage tolerance approach assumes the presence of intrinsic defects naturally present due to manufacturing processes like casting, machining, welding and additive manufacturing. These pre-existing flaws in components start off small and then grow during operational use due to fatigue being the main failure mechanism for the components subjected to dynamic loading. Fracture toughness is a measure of the energy required to fracture a material having a crack. Higher fracture toughness means the material is more resistant to crack growth. The knowledge of fracture toughness helps a designer to determine how long the component can remain in service before a crack grows so long that the intact cross-section of the component cannot support the load. This becomes very important from safety point of view that the pre-existing t i t l t i i t ti ti t lli ll i . t l i t l ti t t i i i l t i i . i t i l t ll i l i l t t i i it l l ti . t i li t iti t i l t l t t it l t i t l ll . t l t i t i l t t i l ti t i i ti ti t . t . li e . . This is an open access article under the CC BY-NC-ND license ( tt :// ti . /li / / . i i ilit i l i i i : ti t ; i it l I l ti ; ; t iti t i l t l . i i i t l t t i t ti i t i . t l t i t i i t t ll t t t i li ti , i i , l i iti t i . i ti l i t t t ll t i ti l t ti i t i il i t t j t t i l i . t t i t i t t t i l i . i t t t t i l i i t t t t . l t t l i t t i l t t i i i l t t t i t t ti t t t t t l . i i t t t i t i t t t i ti ICSI 2021 The 4th International Conference on Structural Integrity On the use of the plastic component of the CTOD for fatigue analysis in austenitic stainless steel M. Ajmal 1,2 , C. Lopez-Crespo 1,3 , A. S. Cruces 1 , F. V. Antunes 4 , P. Lopez-Crespo 1* 1 Department of Civil and Materials Engineering, University of Malaga, C/Dr Ortiz Ramos, s/n, 29071 Malaga, Spain, plopezcrespo@uma.es 2 Yanbu Industrial College, Alnahdah, Al-Nahdah, Yanbu 46452, Saudi Arabia 3 Politechnic Institute Jesus Marin, C/Politecnico, 1, 29007 Malaga, Spain 4 CEEMPRE, Department of Mechanical Engineering, University of Coimbra, Portugal , ,3 1 4 1* t t f i il t i l i i , i it f l , / ti , / , l , i , l . I t i l ll , l , l- , , i i lit i I tit t i , / lit i , , l , i , t t f i l i i , i it f i , t l

-

t r .

li

I . .

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira i i rti l r t - - li ( tt :// r ti . r /li / - - / . ) r-r i r r i ilit f r i l i r ir r ir

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.032