PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 633–639 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r lI t rit r i ( )

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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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Numerical simulation of residual stresses induced by TIG butt welding of thin plates made of AISI 316L stainless steel Diogo F. Almeida a , Rui F. Martins b, *, João B. Cardoso b a Faculty of Sciences and Technology, Universidade Nova de Lisboa, Department of Mechanical and Industrial Engineering, Campus de Caparica, 2829-516 C parica, Portugal b UNIDEMI, Faculty of Sciences and Technology, Universidade Nova de Lisboa, Department of Mechanical and Industrial Engineering, Campus de Caparica, 2829-516 Caparica, Portugal The paper herein presented refers to the numerical simulations of a TIG butt-welding process applied to thin plates made of an AISI 316L austenitic stainless steel. Finite element (FE) thermal analyses were initially carried out in order to obtain the transient temperature distributions in the plates, and, subsequently time-dependent thermal results were used in the FE structural analyses, in order to calculat the residual stresses and deformations introduc d by the welding process. A double Gaussian distribution – namely double ellipsoid -, with front and re ar imension’s areas of the arc d fined based on real weld bead’s measurement, was used as the heat source model (power density), and it was considered that it moved at constant speed. Numerical results calculated were in good agreement with the experimental residual stresses measured by the hole-drilling method, showing the adequacy of the method implemented and its potential to estimate residual stresses and distortions. In fact, it was found a deviation of 19 % for the maximum principal stress calculated, while for the minimum principal stress a deviation value of 9 % was obtained; in addition, the simulated weld bead presented slight deviations from the macrograph sample and the differences related to the depth of the weld pool were around 2%. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. , oso b a lt f i l , i i i , t t f i l I t i l i i , i , - a a i , t l b I I, lt f i l , ni i i , t t f i l I t i l i i , i , - i , t l i t t t i l i l ti tt l i li t t i l t t iti t i l t l. i it l t t l l i iti ll i t i t t i t t i t t t i t i ti i t l t , , tl ti t t l lt i t t t l l , i t l l t t i l t ti i t t l i . l i i t i ti l l lli i , it t i i t i l l t, t t l it , it i t t i t t t . i l lt l l t i t it t i t l i l t t l illi t , i t t t i l t it t ti l t ti t i l t i t ti . t, it i ti t i i i l t l l t , il t i i i i l t i ti l t i ; i iti , t i ulated weld bead presented slight devi ti ns from the acrograph sample and the differences related to the depth of the l l . © 2017 The Authors. Published by Else i . . Peer-review under responsibility of the S i ti i Committee of ICSI 2017. © 2017 The Author . Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Residual stresses; Distortion; TIG welding process; AISI 316L; Numerical modelling; Finite Element Method. Keywords: Residual stresses; Distortion; TIG welding process; AISI 316L; Numerical modelling; Finite Element Method. Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +351-21-294 85 67; fax: +351-21-294 85 31. E-mail address: rfspm@fct.unl.pt i t r. l.: - - ; f : - - . - il : rf f t. l. t rr

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.032 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. l i r . . i i ilit t i ti i itt . - t r . li