PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1438–1441 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t gri y 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 Study of the effect of upstream slope on water pressure in concrete gravity dam Hichem Mazighi 1 *, Mustapha Kamel Mihoubi 1 1 Laboratory Water Resource Mobilization and Enhancement (LMVR), National High School for Hydraulic (ENSH), BP 31 Blida, ALGERIA. Abstract In recent past, some research work has been done to considerate properly the water pressure in concrete gravity dam to take it into account for crack propagation. However, a two-dimensional finite element model is developed to calculate the water pressure under hydrostatic pressure on two geometri s cases of Kinta concrete gravity dam. The results show the upstream slope affects considerably the water pressure at the dam bottom in case one comparing to case two due to vertical hydrostatic pressure, leads to important displacement at the crest of the dam that influence the global behavior of the dam inducing to aperture of cracks. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: concrete, dam, water pressure. 1. Intro uction Modeling the influence of water pressure plays an important role in the analysis of the stability of concrete dams subjected to its normal level pool. The hydrostatic pressure induces additional material damage, reduces resistance to cracking (Zhu and Pekau 2007, Bhattacharjee and Léger 1995). Major research efforts on influence of water pressure in concrete dans over the past three decades are realized (Chappell and Ingraffea 1981, Dewey et al. 1994, Feng et al. 1996, Barpi and Valente 2000, Javanmardi et al. 2005, Pekau and Zhu 2008, Shi et al. 2013). ECF22 - Loading and Environmental effects on Structural Integrity Study of the effect of upstream slope on water pressure in concrete gravity dam Hichem Mazighi 1 *, Mustapha Kamel Mihoubi 1 1 Laboratory Water Resource Mobilization and Enhancement (LMVR), National High School for Hydraulic (ENSH), BP 31 Blida, ALGERIA. Abstract In recent past, some research work has been done to considerate properly the water pressure in concrete gravity dam to take it into account for crack propagation. However, a two-dimensional finite element model is developed to calculate the water pressure under hydrostatic pressure on two geometries cases of Kinta conc ete gravity da . The results show the upstream slope affects considerably the water pressure at the dam bottom in case one comparing to case two due to vertical hydrostatic pressure, leads to important displacement at the crest of the dam that influence the global behavior of the dam inducing to aperture of cracks. © 2018 The Authors. Published by Elsevier B.V. Peer- eview under resp sibility of the ECF22 organizers. Keywords: c crete, dam, water pressure. 1. Introduction Modeling the influence of water pressure plays an important role in the analysis of the stability of concrete dams subjected to its normal level pool. The hydrostatic pressure induces additional material damage, reduces resistance to cracking (Zhu and Pekau 2007, Bhattacharjee and Léger 1995). Major researc efforts on influence of water pressure in concrete dans over the past three decades are realized (Chapp ll and Ingraffea 1981, Dewey et al. 1994, Feng et al. 1996, Barpi and Valente 2000, Javanmardi et al. 2005, Pekau and Zhu 2008, Shi et al. 2013). © 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. E-mail address: h.mazighi@ensh.dz * Corresponding author. E-mail address: h.mazighi@ensh.dz

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.2018.12.298