PSI - Issue 33

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

www.elsevier.com/locate/procedia

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ScienceDirect

Procedia Structural Integrity 33 (2021) 320–329

© 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 © 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 co ittee of the IGF ExCo The influence of residual stresses generated by plastic deformation at the weld toe on the crack propagation speed is analyzed. The existence of residual compression stress fields causes a delay in crack growth. The obtained results are compared with the integration solutions of the Paris-Erdogan law using the stress intensity factor computed through the Mk factor proposed by Bowness and Lee, included in BS 7910 standard. © 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 Abstract In this article, a three-dimensional finite element model is used to predict the growth of cracks at the weld toe of a T-joint. The model is developed using the MSC Marc software. Fatigue life is estimated by integrating the Paris-Erdogan law and the stress intensity factors are obtained by the virtual crack closure technique. The influence of residual stresses generated by plastic deformation at the weld toe on the crack propagation speed is analyzed. The existence of residual compression stress fields causes a delay in crack growth. The obtained results are compared with the integration solutions of the Paris-Erdogan law using the stress intensity factor computed through the Mk factor proposed by Bowness and Lee, included in BS 7910 standard. Abstract In this article, a three-dimensional finite element model is used to predict the growth of cracks at the weld toe of a T-joint. The model is developed using the MSC Marc software. Fatigue life is estimated by integrating the Paris-Erdogan law and the stress intensity factors are obtained by the virtual crack closure technique. 1. Introduction The residual stresses affect fatigue life, therefore must be included in design. Tensile residual stresses reduce fatigue life while compressive residual stresses extend fatigue life. Compressive residual stresses may be introduced 1. Introduction The residual stresses affect fatigue life, therefore must be included in design. Tensile residual stresses reduce fatigue life while compressive residual stresses extend fatigue life. Compressive residual stresses may be introduced Keywords: Residual stresses; T-welded joints; fatigue crack growth; FEM IGF26 - 26th International Conference on Fracture and Structural Integrity Simulation of crack growth in T-welded joints - residual stress field effect Ramalho, A.L. a,b,  , Antunes, F.V. b , Ferreira, J.A.M. b a Polytechnic Institute of Castelo Branco, 6000-767 Castelo Branco, Portugal b Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Univ Coimbra, 3004-516 Coimbra, Portugal IGF26 - 26th International Conference on Fracture and Structural Integrity Simulation of crack growth in T-welded joints - residual stress field effect Ramalho, A.L. a,b,  , Antunes, F.V. b , F rreira, J.A.M. b a Polytechnic Institute of Castelo Branco, 6000-767 Castelo Branco, Portugal b Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), Univ Coimbra, 3004-516 Coimbra, Portugal Keywords: Residual stresses; T-welded joints; fatigue crack growth; FEM

 Corresponding author. E-mail address: aramalho@ipcb.pt  Corresponding author. E-mail address: aramalho@ipcb.pt

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 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 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.2021.10.039