PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2038–2045 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 ScienceDirect Structural Integrity Procedia 00 (2016) 000–000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. Xuesong Liu a , Wei Song a *, Zhongjie Yan a , Wang Qiang a , Haibo pan a a State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China b Second affiliation, Address, City and Postcode, Country Abstract The aim of this paper is to numerically simul te the stress concentration response of the weld structures and compare the results with analytical equations performed on the misalignment effect. Different structures numerical models are subjected to tensile load which lead to large stress in local area of welded structures due to the discrepancy of plates thickness. The transitions of unequal thickness plates undertaking the in-plate force could also lead to the local bending. The stress concentration factors were simulated using the finite element method (FEM). For investigations of misalignment welded structures local stress concentration, the effects of geometrical variables, i.e. the cope hole of welded plates connecting zone, the position of structure plane, the slope ratio of unequal plates, the number of components, are systematically c nsidered. Finally, by the comparison of numerical results, the optimized form of structures could be determined. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Misalingment, Stress concentration factor, geometry Msmatched, weld plated structures; 1. Introduction In the processing of manufacturing steel structures, butt-welded joint plays an important role in connecting the different components of welded structures, such as ships, floating offshore platforms, frame structures, shell structures, 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Misalignment effect on stress co centration of th ckness mismatched plate structures Xuesong Liu a , Wei Song a *, Zhongjie Yan a , Wang Qiang a , Haibo pan a State Key Laboratory of Advanced Welding and Joining, Ha bin Institute of Technology, Harbin 150001, China b Second affiliation, Address, City and Postcode, Country Abstract The aim of this paper is to numerically simulate the stress concentration response of the weld structures and compare the results with analytical equations performed on the misalignment effect. Different structures numerical models are subjected to tensile load which lead to large stress in local area of welded structures due to the discrepancy of plates thickness. The transitions of unequal thickness plates undertaking the in-plate force could also lead to the local bending. The stress concentration factors were simulated using the finite element method (FEM). For investigations of misalignment welded structures local stress concentration, the effects of geometrical variables, i.e. the cope hole of welded plates connecting zone, the position of structure plane, the slope ratio of unequal plates, the number of components, are systematically considered. Finally, by the comparison of numerical results, the optimized form of structures could be determined. © 2016 The Authors. Published by Elsevi r B.V. Peer-review und r responsibility of the Scientific Committee of ECF21. Keywords: Misalingment, Stress concentration factor, geometry Msmatched, weld plated structures; 1. Introduction In the processing of manufacturing steel structures, butt-welded joint plays an important role in connecting the different components of welded structures, such as ships, floating offshore platforms, frame structures, shell structures, Copyright © 2016 The Aut ors. Published by Elsevier B.V. This is an op n access article under the CC BY-NC-ND licens (ht p:// ativecommons.org/licenses/by-nc-nd/4.0/). Peer-review und r responsibility of the Scientific Co mittee of ECF21. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Misalignment effect on stress concentration of thickness mismatched plate structures * Corresponding author. Tel.: +86-0451-86418433; fax: +86-0451-86418433 E-mail address: swingways@hit.edu.cn

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +86-0451-86418433; fax: +86-0451-86418433 E-mail address: swingways@hit.edu.cn

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 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 Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.256