PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1482–1487 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I t grity 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 Strength of Plate with the Filled Crack under Multiparameter Loading Ivan Shatskyi*, Iryna Kurtash Ivano-Frankivsk Branch of Pidstryhach-Institute for Applied Problems in Mechanics and Mathematics, NAS of Ukraine, Mykytynetska str., 3,Ivano-Frankivsk, 76002, Ukraine Abstract The problem of stressed state of an elastic plate weakened by narrow rectilinear through crack (slit) filled with low-modulus material is considered within framework the classical two-dimensional plate theory. For the inclusion of small width the hypothesis of elastic Winkler’s layer is accepted. The boundary problem for the pair of biharmonic equations with complicated boundary conditions on the cut is formulated. The analytical solution of singular integrodifferential equations of the problem is built for a case of elliptical form of slit and uniform multiparameter load (combined tension, shear, bending and twisting). The jumps of the displacements and the normal rotation angles on the cut, the stress intensity factors for crack tips and the stresses in the filler are obtained. Special attention is paid to the issue of limited equilibrium of composition. The two mechanisms of fracture are considered: cracking of the plate near the peak of a slit and breach of filler in grity. The first of the is escribed by the criterion of the linear m chanics of fracture and the secon one is described by the classical theory of strength. Th considered odel of th filled slit allows analytically evaluating the results of the renovation of defective lamellar structures. The diagrams of limiting equilibrium of plate with filled slit are built for several options of two-parametric loading. The key parameters that determine the success of injection technology for repair of the cracked plate for a given loading trajectory are the relative stiffness and relative strength of the filler. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of he ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Strength of Plate with the Filled Crack under Multiparameter Loading Ivan Shatskyi*, Iryna Kurtash Ivano-Frankivsk Branch of Pidstryhach-Institute for Applied Problems in Mechanics and Mathematics, NAS of Ukraine, Mykytynetska str., 3,Ivano-Frankivsk, 76002, Ukraine Abstract The problem of stressed state of an elastic plate weakened by narrow rectilinear through crack (slit) filled with low-modulus material is consider d within framework the classical two-dimensional plat theory. For the in lusion of small width the hypothesi of elastic Wi kler’s layer is accepted. T bound ry problem for the pair of biharmonic equati s with complicat d boundary conditions on th cut is formulat d. The analytical solution of singul r integrodifferential ti s of t e problem is built for a ase of elliptical form of slit and uniform multiparameter load (combined t nsion, sh ar, bending and twisting). The jumps of the displacements nd the normal rotation angles on the cut, the stress intensity factors for crack tips the stresses in the filler ar obtained. Special att ntion is paid to the i sue of limited equilibrium of composition. The two mechanisms of fracture r considered: cracking of the plate near the peak of a slit and breach of filler integrity. The first of them is described by the criterion of the linear mechanics of fracture and the second one is described by the classical theory of strength. The considered model of the filled slit llows analytically evaluating the results of th renovation of defective lamellar structures. The diagrams f limiting equilibrium f plate with filled slit are built for several options of two-param tric lo ding. The key parameters that determine the success of injection technology for repair of the cracked plate f r a given loading trajectory are the relative stiffness and relative trength of th filler. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: plate, filled crack, multiparameter loading, fracture, limiting equilibrium . Keywords: plate, filled crack, multiparameter loading, fracture, limiting equilibrium .

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.:+380-99-444-4967; fax: +380-342- 547-139. E-mail address: ipshatsky@gmail.com. * Corresponding author. Tel.:+380-99-444-4967; fax: +380-342- 547-139. E-mail ad ress: ipshatsky@gmail.com.

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.2018.12.305