PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1273–1278 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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 Creep behavior of ice-soil retaining structure during shaft sinking Kostina A. a , Zhelnin M. a, *, Plekhov O. a , Panteleev I. a , Levin L. b a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm 614013, Russia b Mining institute, Ural Branch of Russian Academy of Sciences, Perm 614007, Russia Abstract The article is devoted to analysis of deformation of an ice-soil retaining structure during a vertical mine shaft sinking by applying the artificial ground freezing technique. The analysis was performed by finite element numerical simulation. Since frozen soils possess rheological properties, creep deformation of the ice-soil structure was considered. To determine the creep deformation, the Vaylov’s constitutive relations was used. I the relations the creep behavior is described by the Norton-Bailey creep law and the volumetric creep strain is restricted to be zero. The wall thickness of the ice-soil structure w as estimated by the Vaylov’s formula that is widely used in structural design of potash mines. As a result of the study, it was established that for time required for the lining installation at large depths of the shaft sinking the creep deformation of the ice-soil structure exceeds admissible value guaranteeing safety of the excavation process. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: artificial ground freezing; mine shaft; creep deformation; numerical simulation 1. Introduction In the mining indus ry, the tenden y to an incre s of a quantity f vertic l mine shafts constructed under hard hydrogeological conditions for exploitation of mineral deposits occurring at extreme great depths. One of universal and efficient technique for a mine shaft sinking in weak, unstable, fluid-saturated soils is artificial ground freezing (Andersland and Ladanyi (2013)). The purpose of the technique is formation prior to an excavation of a temporary ice-soil retaining structure around the shaft, which withstands rock pressure and eliminates groundwater filtration. ECF22 - Loading and Environmental effects on Structural Integrity Creep behavior of ice-soil retaining structure during shaft sinking Kostina A. a , Zhelnin M. a, *, Plekhov O. a , Panteleev I. a , Levin L. b a Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm 614013, Russia b Mining institute, Ural Branch of Russian A ademy of Scien es, Perm 614007, Russia Abstract The article is devoted to analysis of deformation of an ice-soil retaining structure during a vertical mine shaft sinking by applying the artificial ground freezing technique. The a alysis was performed by finite leme t numerical simulation. Since frozen soils possess rheological properties, reep deformation of the ice-soil structure was considered. To deter ine the creep deformation, the Vaylov’s constitutive elations was used. In the relations the creep behavior is desc ibed by th Norton-Bail y creep law and the volumetric creep strain is restricted to be zero. The wall thi kness of the ice-soil structure w as estimated by th V ylov’s formula that is widely used in structural design of potash mines. As a result of the study, it was established that for time required the lining installation at large depths of the shaft sinking the creep deformation of the ice-soil structure exceeds admissible value guaranteeing s fety of the xcavation process. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: artificial ground freezing; mine shaft; creep deformation; numerical simulation 1. Introduction In the mining industry, the tendency to an i crease of a quantity of vertical mine shafts constructed under hard hydrogeological conditions for exploitation of mineral deposits occurring at extreme great depths. One of universal and efficient technique for a mine shaft sinking in weak, unstable, fluid-saturated soils is artificial ground freezing (Andersland and Ladanyi (2013)). The purpose of the technique is formation prior to an excavation of a temporary ice-soil retaining structure around the shaft, which withstands rock pressure and eliminates groundwater filtration. © 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 o ganizers. * Corresponding author. Tel.: +7-342-237-8312; fax: +7-342-237-8487. E-mail address: zhelnin.m@icmm.ru * Corresponding author. Tel.: +7-342-237-8312; fax: +7-342-237-8487. E-mail ad ress: zhelnin.m@icmm.ru

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.2018.12.260