PSI - Issue 6

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 6 (2017) 83–89 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 Elsevier B.V. Peer-review under 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) Experimental investigation of dynamic crack propagation in PMMA plates Nikita Kazarinov a, *, Ivan Smirnov a , Yuri Sudenkov a , Yuri Petrov a,b , Viacheslav Slesarenko c a Saint Petersburg State University, Saint Petersburg, 199034, Russia b Institute of Problems of Mechanical Engineering (Russian Academy of Sciences), Saint Petersburg, 199178, Russia c Lavrentiev Institute of Hydrodynamics (Russian Academy of Sciences, Siberian branch), Novosibirsk, 630090, Russia Abstract In this paper we present experimental data on dynamic crack propagation in square PMMA plates of two types – 3.5 and 20 mm thick. Samples were loaded dynamically (mode I loading type) and crack tip position was registered using high speed camera. Explosion of a copper wire due to high electrical current was used to load faces of the initially prepared cracks. In order to investigate stress intensity factor ( " ) history, method of caustics was applied. Thick samples demonstrated considerably higher values of final crack travel distance and higher crack velocity values. Additionally, dependence of stress intensity factor on crack v locity was observed. © 2017 The Author . Published by Elsevier B.V. Peer-review und r responsibility of the MCM 2017 organizers. Keywords: cr ck propagation dynamic fracture, stress intensity, caustic PMMA XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Experimental investigation of dynamic crack propagation in PMMA plates Nikita Kazarinov a, *, Ivan Smirnov a , Yuri Sudenkov a , Yuri Petrov a,b , Viacheslav Slesarenko c a Saint Petersburg Stat U iversity, Saint P tersburg, 199034, Russia b Institute of Problems of Mechanical Engineering (Russian Academy of Sciences), Saint Petersburg, 199178, Russia c Lavrentiev Institute of Hydrodynamics (Russian Academy of Sciences, Siberian branch), Novosibirsk, 630090, Russia Abstract I this paper we present experimental data on dynamic crack propa ation in square PMMA plates of two types – 3.5 and 20 mm thick. Samples were loaded dynamically (mode I loading type) and crack tip p sition was registered using high speed camera. Explosion of a copper wire due to high electrical current was used to load faces of the initially prepared cracks. In order to investigate stress intensity factor ( " ) history, method of causti s was applied. Thick samples demonstrated onsiderably higher values of final crack travel distance and higher crack velocity values. Additionally, dependence of stress intensity factor on crack velocity was observed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 rganizers. Keywo ds: crack propagation, dynamic fracture, tress int sity, caustic, PMMA

© 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.: +7 964 366 64 64. E-mail address: n.kazarinov@spbu.ru * Correspon ing author. Tel.: +7 964 366 64 64. E-mail address: n.kazarinov@spbu.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.2017.11.013