PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 22 2–22 9 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Influence of residual stress and heterogeneity on mechanical field at crack tips in safety end of nuclear power plant Rui Guo a,b, *, He Xue a , Xiaoyan Gong a a Xi’an University of Science and Technology ， Yanta Road No.58, Xi ’ an 710054, China b Brunel University, Kingston Lane, London UB8 3PH, UK Abstract Welded residual stress is one of the main factors lead to stress corrosion cracking (SCC) in dissimilar metal welded joints of nuclear power plant safety end. Meanwhile, the material mechanical heterogeneity of welded joints makes the SCC crack tip mechanical fields more complicated. By means of theoretical analysis and Finite Element Method, the laws of stress and strain distribution at SCC crack tip under the interactive effect of residual stress and mechanical heterogeneity in nuclear power plant safety end were simulated and analyzed. The results show that due to the variation of the residual stress, the propagation of the SCC crack might even be paused; Cracks adjacent to material interface might change their directions due to the heterogeneity of the welded structure. © 2018 The Authors. Published by Elsevier B.V. Pe r-review under res onsibility of the ECF22 organizers. Keywords: Structural Integrity; Numerical Simulation Test; Stress Corrosion Cracking; Welding Residual Stress; Heterogeneity 1. Introduction The nuclear power plants which are in service and under construction in China are mainly Pressurized Water Reactors (PWR). Welding is one of the most widely used constructing process for connections between various key structures in the reactor. There are numerous safety ends in the primary circuit of pressurized water reactors welded by dissimilar metals. Because the working environment is high-temperature and high-pressure irradiative water environment, which contributed to the emergence of Environmentally Assisted Cracking (EAC) which is caused by wat r chemistry factors, mat rial factors, and mechanical factors. The EAC represented by Stress Corrosion Cracking (SCC) is one of the key issues affecting the long-term safe operation of nuclear power equipment. The experience of ECF22 - Loading and Environmental effects on Structural Integrity Influence of residual stress and heterogeneity on mechanical field at crack tips i s fety end of nuclear power plant Rui Guo a,b, *, He Xue a , Xiaoyan Gong a a Xi’an University of Science and Technology ， Yanta Road No.58, Xi ’ an 710054, China b Brunel U iversity, Kingst n Lane, Lond n UB8 3PH, UK Abstract Welded residual stress is one of the main factors lead to stress corrosion cracking (SCC) in dissimilar metal welded joints of nuclear power plant safety end. Meanwhile, the material mechanical heterogeneity of welded joints makes the SCC crack tip mechanic l fields more com licat d. By me s of theoretical a alysis and Finite Element Method, the laws of stress and strain distribution t SCC crack tip under the interactive effect of residual stress and mechanical heterogeneity in nuclear power plant safety end were simulated and analyzed. The results show that due to the variation of the residual stress, the propagation of the SCC cr ck might even be pause ; Cracks adjacent to material interface might change their directions due to the ter geneity of the welded structure. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Structural Integrity; Numerical Simulation Test; Stress Corrosion Cracking; Welding Residual Stress; Heterogeneity 1. Introduction The nuclear power plants which are in service and under construction in China are mainly Pressurized Water Reactors (PWR). Welding is one of the most widely used constructing process for connections between various key structures in the reactor. There are numerous safety ends in the primary circuit of pressurized water reactors welded by dissimilar metals. Because the working environment is high-temperature and high-pressure irradiative water environment, which contributed to the emergence of Environmentally Assisted Cracking (EAC) which is caused by water chemistry factors, material factors, and mechanical factors. The E C represented by Stress Corrosion Cracking (SCC) is one of the k y issues affecting the long-term safe operation of nuclear power equipment. The experience of © 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.

* 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 r sponsibility of the ECF22 organizers. * Corresponding author. Tel.: +86-29-85583846; fax: +86-29-85583845. E-mail address: larklork@gmail.com; b201403011@stu.xust.edu.cn * Corresponding author. Tel.: +86-29-85583846; fax: +86-29-85583845. E-mail ad ress: larklork@gmail.com; b201 03011@stu.xust.edu.cn

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.2018.12.140