PSI - Issue 42

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

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

ScienceDirect

Procedia Structural Integrity 42 (2022) 362–367

23 European Conference on Fracture - ECF23 Some problems of xFEM modelling of surface crack growth in a turbine shaft Nikola Milovanovic a , Branislav Djordjevic a , *, Simon Sedmak a , Aleksandar Grbovic b , Igor Martić a turbine shaft , Igor Ma a

a Innovation Center of Faculty of Mechanical Engineering, Kraljice Marije 16, 11120 Belgrade, Serbia b Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia a Innovation Center of Faculty of Mech i l i i , lji ij , l , i b lt f i l i i , i it f l , lji ij , l , i

Abstract

© 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 the scientific committee of the 23 European Conference on Fracture – ECF23 One of the major problems in numerical simulation of fatigue loading represents the generation of a finite element mesh, since the model with crack cannot use combinations of different types of mesh elements (such as HEX or TET). This paper presents the problem of the generated FE mesh during fatigue simulation of the Kaplan Turbine Shaft model in ABAQUS and Morfeo Crack software packages. The model contains an initial crack of 37 mm. Simulation was performed in order of assessing the integrity of shaft with crack. During the first attempt, a fined mesh in the vicinity of the crack was used, which did not prove to be effective in obtaining satisfactory results. FE whose size was similar or the same as the FE around the fatigue crack growth domain were used in the second attempt. After remeshing, the numerical simulation proved to be successful and gave more realistic results. © 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 23 European Conference on Fracture - ECF23 Keywords: turbine shaft; fatigue crack growth; xFEM; integrity 1. Introduction Structures with cracks and other defects have been the subject of numerous studies over the years, leading to numerous approaches in estimating their integrity and life, [1-15]. The principles of fracture mechanics represent one of the bases for studies in this field, because it recognizes and takes into account the presence of crack-like defects. In structural integrity assessment, often a multidisciplinary approach of two or more scientific disciplines is needed, [4,5], while some i l i l ti ti l i t t ti i it l t , i t l it t i ti i t t l t . i t t l t t i ti i l ti t l i t l i t . l t i i iti l . i l ti i i t i t it t it . i t i t tt t, i i t i i it t , i i t t ti i t i i ti t lt . i i il t t t ti t i i t tt t. t i , t i l i l ti t l li ti lt . 0 t . li l i . . i i an open access ti l t C BY-NC-ND license (http://creativecommons. /li / / . / i i ilit t : t r i ft; f ti r r t ; ; i t rit . , , . , . , , , , t j l i

* Corresponding author. E-mail address: b.djordjevic88@gmail.com i t r. - il : . j r j i il. rr

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 23 European Conference on Fracture - ECF23 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li

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 the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.045