PSI - Issue 25

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 25 (2020) 136–148 Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com / locate / procedia www.elsevier.com / locate / procedia

© 2020 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 VCSI1 organizers Abstract The study and design of cyclically loaded structures cannot neglect the evaluation of their fatigue behavior. Today numerical prediction tools allow adopting, in various industrial fields, refined and consolidated procedures for the assessment of cracked parts through analyses based on fracture mechanics. An high level of detail can be obtained through the use of well consolidated FEM methods, allowing an accurate and reliable calculation of the flaw Stress Intensity Factor (SIF) and its resulting prediction in terms of crack propagation. A challenging step for this computational workflow remains, however, the generation and update of the computational grid during crack evolution. It is in this context that radial basis functions (RBF) mesh morphing is emerging as a viable solution to replace the complex and time-consuming remeshing operation. The flaw front is updated, according to its propagation, by automatically deforming the numerical grid obtaining an evolutionary workflow suitable to be used for industrially sized numerical meshes (many millions of nodes). A review of applications, obtained by exploiting FEA (Ansys Mechanical) and mesh morphing (RBF Morph) state of-the-art tools, is presented in this work. At first the proposed workflow is applied on a circular notched bar with a defect controlled by a two-parameters evolution. The same approach is then refined and demonstrated for a Multi Degree of Freedom (MDoF) case on the same geometry and on the vacuum vessel port stub from the fusion nuclear reactor Iter. c 2020 The Authors. Published by Elsevier B.V. is is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) r-review lin : Peer-review und r responsibility of the VCSI1 organizers. Keywords: 3-D cracks; Fatigue crack growth; SIF; RBF; Abstract The study and design of cyclically loaded structures cannot neglect the evaluation of their fatigue behavior. Today numerical prediction tools allow adopting, in various industrial fields, refined and consolidated procedures for the assessment of cracked parts through analyses based on fracture mechanics. An high level of detail can be obtained through the use of well consolidated FEM methods, allowing an accurate and reliable calculation of the flaw Stress Intensity Factor (SIF) and its resulting prediction in terms of crack propagation. A challenging step for this computational workflow remains, however, the generation and update of the computational grid during crack evolution. It is in this context that radial basis functions (RBF) mesh morphing is emerging as a viable solution to replace the complex and time-consuming remeshing operation. The flaw front is updated, according to its propagation, by automatically deforming the numerical grid obtaining an evolutionary workflow suitable to be used for industrially sized numerical meshes (many millions of nodes). A review of applications, obtained by exploiting FEA (Ansys Mechanical) and mesh morphing (RBF Morph) state of-the-art tools, is presented in this work. At first the proposed workflow is applied on a circular notched bar with a defect controlled by a two-parameters evolution. The same approach is then refined and demonstrated for a Multi Degree of Freedom (MDoF) case on the same geometry and on the vacuum vessel port stub from the fusion nuclear reactor Iter. c 2020 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 line: Peer-review under responsibility of the VCSI1 organizers. Keywords: 3-D cracks; Fatigue crack growth; SIF; RBF; 1st Virtual Conference on Structural Integrity – VCSI1 High fidelity numerical fracture mechanics assisted by RBF mesh morphing Corrado Groth a , Stefano Porziani a , Andrea Chiappa a , Edoardo Pompa a,c , Riccardo Cenni b , Matteo Cova b , Gabriele D’Amico c , Francesco Giorgetti d , Carlo Brutti a , Pietro Salvini a , Michelle Rochette e , Marco Evangelos Biancolini a, ∗ a University of Rome “Tor Vergata”, Via del Politecnico 1, Rome 00133, Italy 1st Virtual Conference on Structural Integrity – VCSI1 High fidelity numerical fracture mechanics assisted by RBF mesh morphing Corrado Groth a , Stefano Porziani a , Andrea Chiappa a , Edoardo Pompa a,c , Riccardo Cenni b , Matteo Cov b , Gabriele D’Amico c , Francesco Giorgetti d , Carlo Brutti a , Pietro Salvini a , Michelle Rochette e , Marco Evangelos Biancolini a, ∗ a University of Rome “Tor Vergata”, Via del Politecnico 1, Rome 00133, Italy b SACMI Imola S.C. - Ceramic Engineering Department,Via Selice Provinciale, 17 / A, Imola 40026, Italy c Fusion for Energy, c / Josep Pla, n.2, Torres Diagonal Litoral, Edificio B3, E-08019, Barcelona, Spain d Universita` degli Studi della Tuscia, Largo dell’Universita` , Viterbo 01100, Italy e ANSYS France, 11 Avenue Albert Einstein, 69100 Villeurbanne, France b SACMI Imola S.C. - Ceramic Engineering Department,Via Selice Provinciale, 17 / A, Imola 40026, Italy c Fusion for Energy, c / Josep Pla, n.2, Torres Diagonal Litoral, Edificio B3, E-08019, Barcelona, Spain d Universita` degli Studi della Tuscia, Largo dell’Universita` , Viterbo 01100, Italy e ANSYS France, 11 Avenue Albert Einstein, 69100 Villeurbanne, France

∗ Corresponding author. Tel.: + 39 0672597124. E-mail address: biancolini@ing.uniroma2.it ∗ Corresponding author. Tel.: + 39 0672597124. E-mail address: biancolini@ing.uniroma2.it

2452-3216 © 2020 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 VCSI1 organizers 10.1016/j.prostr.2020.04.017 2210-7843 c 2020 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 line: Peer-review under responsibility of the VCSI1 organizers. 2210-7843 c 2020 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 line: Peer-review under responsibility of the VCSI1 organizers.