PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1967–197 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect Structural Integrity Procedia 00 (2018) 000–000

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www.elsevier.com/locate/procedia 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 Tomographic investigation of the fracture toughness of the quasi brittle specimens subjected to four-point bending test Daniel Vavřík a *, Pavel Beneš a , Tomáš Fíla a , Petr Koudelka a , Ivana Kumpová a , Daniel Kytýř a , Michal Vopálen ký a , Martin Vavro b , Leona Vavro b a Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 76, Prague 9, Czech Republic 2 Institute of Geonics of the Czech Ac demy of Sciences, Stude tska 1768, 708 00 Ostrava-Poruba, Czech Republic Abstract It is well known that detailed investigation of fracture mechanics f the quasi-brittle materials is rather complicated task as standard loading devices do not allow to interrupt loading test after reaching maximal loading force. The reason is that the point of maximal loading force is followed by the evolution of the fracture processes, due to elastic energy stored in the loading device itself. This fundamental obstacle was overcome in this work thanks to a newly developed compact four-point bending device. We show that shape of the crack can be evaluated on the basis of the so called differential tomography, which compares reference and actual states of the loaded specimen. Similarly, it is possible to evaluate displacement and strain fields by analyzing the series of loading states using the digital image correlation tools. Using such a methodology, local fracture toughness K I c is calculated thanks to information about of the crack path and evaluated CTOD parameter. © 2018 The Authors. Published by Elsevier B.V. Peer‐ evi w under r sponsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Tomographic investi tion of th fracture toughness of he quasi brittle specimens subjected to four-point bending test Daniel Vavřík a *, Pavel Beneš a , Tomáš Fíla a , Petr Koudelka a , Ivana Kumpová a , Daniel Kytýř a , Michal Vopálenský a , Martin Vavro b , Leona Vavro b a Inst tute of Theoretical and Applied M chanics of the Czech Academy of Sciences, Prosec á 76, Prague 9, Czech Republic 2 Institute of Geonics of the Czech Academy of Sciences, Studentska 1768, 708 00 Ostrava-Poruba, Czech Republic Abstract It is well known that detailed investigation of fracture mechanics of the quasi-brittle materials is rather complicated task as standard loading devices do not allow to interrupt loading test after reaching maximal loading force. The reason is that the point of maximal loading force is followed by the evo ution of the fract re processes, due to elastic en rgy stored in the loading device itself. This fundamental obs acle w s overcome in this work thanks to a newly developed comp ct four-point bending device. We how that sh pe of the crack can be evalua d on the basis of the so called differential tomography, which compares reference and actu st tes of the loaded specimen. Similarly, it is possible to evaluate displacem nt and strain fields by analyzing the seri s of oading states usi g the digital imag rrelation tools. Using uch a methodology, lo al fr ure toughness K I c is cal ulated t anks to information about of the crack p h and evalu ted CTOD par m ter. © 2018 The Authors. Published by Els vier B.V. Peer‐review under responsibility of the ECF22 organizers. Keywords: Fracture process zone; Crack path; Quasi-brittle material; X-Ray computed tomography; Four-point bending test.

Keywords: Fracture process zone; Crack path; Quasi-brittle material; X-Ray computed tomography; Four-point bending test.

© 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.: +420 736 128 638; fax: +420 286 884 634. E‐mail address: vavrik@itam.cas.cz

* 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. * Corresponding author. Tel.: +420 736 128 638; fax: +420 286 884 634. E‐mail address: vavrik@itam.cas.cz 2452‐3216 © 2018 The Authors. Published by Elsevier B.V. Peer‐review under responsibility of the ECF22 organizers.

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.2018.12.263