PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 2174–2179 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000

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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. ECF22 - Loading and Environmental effects on Structural Integrity A new local approach to cleavage fracture and its application in a reactor pressure vessel Guian Qian a,* , Wei-Sheng Lei b,* , Shunpeng Zhu c,d* , José Correia e , Abílio De Jesus e a State Key Laboratory for Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China. b Applied Materials, Inc., 974 East Arques Avenue, Sunnyvale, CA 94085, USA c School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China d Department of Mechanical Engineering, Politecnico di Milano, Milan 20156, Italy e IN GI, Faculty of Engineering, University of Porto, Porto 4200-465, Portugal The paper presents and applies a local approach to correlate the fracture behavior of a notched and fracture mechanics specimen. The random nature of cleavage fracture process determines that both the microscopic fracture stress and the macroscopic properties including fracture load, fracture toughness and the ductile to brittle transition temperature are all stochastic parameters. This understanding leads to the proposal of statistical assessment of cleavage induced notch toughness of ferritic steels according to a new local approach to cleavage f acture. The temp rature independence of th tw Weibull parameters in the new model induces a master curve to correlate the fractur load at different temperatures. This propo d index is applied to compare the no ch toughness of a ferritic steel with t o different microstruct res. © 2018 The Authors.Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Ferritic steels, cleavage fracture, notch brittleness, statistical model ； © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity A new local approach to cleavage fracture and its application in a re ctor pressure vess l Guian Qian a,* , Wei-Sheng Lei b,* , Shunpeng Zhu c,d* , José Correia e , Abílio De Jesus e a State Key Laboratory for Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China. b Applied aterials, Inc., 974 East Arques Avenue, Sunnyvale, CA 94085, USA c School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China d Depa tment of M chanical Engineering, Politecni o di Milano, Milan 20156, Italy e INEGI, Faculty of Engineering, University of Porto, Porto 4200-465, Portug l Abstract The paper presents and applies a local approach to correlate the fracture behavior of a notched and fracture mechanics specimen. random nature of cleavage fracture process determines that both the microsc pic fracture stress and the macroscopic properties including fracture load, fracture to ghness an the ductile to brittle transition temperature are all stochastic parameters. This under anding leads to the proposal of statistical assessment of cleavage i duced notch to ghness of ferritic steels according to a new local approach to cleavage fr cture. The temperature independence of the two Weibull parameters in the new model i duces a master curve to orrelate the fracture load at differ nt temperatures. This proposed ind x is app ied to compar the notch toughness of a ferritic steel wit two different microstructures. © 2018 The Authors.Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organizers. Keywords: Ferritic steels, cleavage fracture, notch brittleness, statistical model ； © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. R actor pressu e vessels (RPVs) in nuclear p wer plants are subject to biaxial loading during pressurized thermal shocks initiated by the loss-of-coolant accidents (Qian and Niffenegger 2013; Qian et al. 2014). The thermal, pressure and residual stresses in the RPV wall combine to form a biaxial stress state at the crack tip. For the sake of nuclear Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Reactor pressure vessels (RPVs) in nuclear power plants are subject to biaxial loading during pressurized thermal shocks initiated by the loss-of-coolant accidents (Qian and Niffenegger 2013; Qian et al. 2014). The thermal, pressure and residual stresses in the RPV wall combine to form a biaxial stress state at the crack tip. For the sake of nuclear Abstract 1. Introduction 1. Introduction

* Corresponding author. Tel.: +86 10-82543841. E-mail address: qianguian@imech.ac.cn (G. Qian), Leiws2008@gmail.com (W.S. Lei), zspeng2007@uestc.edu.cn (S.P. Zhu) * Corresponding author. Tel.: +86 10-82543841. E-mail ad ress: qianguian@imech.ac.cn (G. Qian), Leiws2008@gmail.com (W.S. Lei), zspeng2007@uestc.edu.cn (S.P. Zhu)

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer review under responsibility of the ECF22 organizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.145