PSI - Issue 6

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 Structu al Integrity 6 (2017) 122–127 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 The Authors. Published by Elsevi r B.V. Peer-revi w und r responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Dynamic analysis of gas permeable blasting mat as geometrically nonlinear system with unilateral constraints Lovtsov A.D. a , Kostiunina O.A. a * a Pacific National University, Tikhookeanskaya 136, Khabarovsk 680042, Russia Abstract Blasting mat is used to prevent flyrock accidents, decrease environmental impacts and expand the range of projects where blasting operations could be carried out. Transformable gas permeable blasting mat is made from worn out tires of heavy trucks bound together with chains, ropes or cables. Dynamic model of blasting mat is proposed in this research. It is represented by concentrated masses interacting with unilateral foundation and by elastic weightless incompressible elements. The problem solving involves combination of two types of nonlinearity: geometrical nonlinearity associated with large displacements and contact nonlinearity which emanates from the fact that contact region changes due to deformation of the elements. Explosive loading is simulated by instantaneous impulses applied at different times to different masses. The system behavior under various sequences of explosions is of special interest. Numerical experiments showed that axial forces in elastic elements and maximum flight height of the masses depend on detonation sequence of the blast holes. Employed mathematical model was verified by full-scale experiment. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: Dynamics; Unilateral contact; Geometrical nonlinearity; Blasting mat; Flyrock XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Dynamic analysis of gas permeable blasting mat as geometrically nonlinear system with unilateral constraints Lovtsov A.D. a , Kostiunina O.A. a * a Pacific National University, Tikhookeanskaya 136, Khabarovsk 680042, Russia Abstract Blasting mat is used to prevent flyrock accidents, d crease environmental imp cts and expand the range of projects where lasting operations could be carried out. Transformable gas permeable blasting mat is made from worn out tires of heavy trucks bound together with chai s, ropes or cables. Dy amic model of blasting mat is proposed in this research. It is represented by concentrated masses interacting with unilateral foundation and by elastic weightless incompressible elements. The problem solving involves combinatio of tw typ s of nonlinearity: ge metrical nonlinearity associated with large displacements an contact nonlinearity which emanates from the fact that co tact regi n changes due to deformatio of the eleme ts. Explosive loading is simulated by inst nta eous impulses applied at different times to different masses. The system behavior und r various sequences of explosions is of special interest. Numerical experiments showed that axial forces in elasti ele ents nd maximum flight height of the masses depend on detonation sequence of the blast holes. Employed mathematical model was verified by full-scale experiment. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: Dynamics; Unilateral contact; Geometrical nonlinearity; Blasting mat; Flyrock

© 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.: +7-4212-375182. E-mail address: 006934@pnu.edu.ru * Correspon ing author. Tel.: +7-4212-375182. E-mail address: 006934@pnu.edu.ru

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

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

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.019