PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 1085–1092 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Development of a probabilistic model for the prediction of fatigue life in the very high cycle fatigue (VHCF) range based on inclusion popul tion Anton Kolyshkin a *, Andrei Grigorescu a , Edgar Kaufmann b , Martina Zimmermann c , Hans-Jürgen Christ a a Institut für Werkstofftechnik, Universität Siegen, Paul-Bonatz-Straße 9-11, Siegen 57068, Germany b Department Mathematik, Universität Siegen, Walter-Flex-Straße 3, Siegen 57068, Germany c Institut für Werkstoffwissenschaft, TU Dresden, Helmholtzstraße 7, Dresden 01062, Germany Abstract The aim of the present work is to develop a statistical approach for the correlation between the quality of metallic materials with respect to the size and arrangement of inclusions and fatigue life in the VHCF regime by using the example of an austenitic stainless steel of type AISI 304 co taining martensite from pr deformation. For this purpose, the size and location of about 60000 inclusions in cross sections of an AISI 304 sheet in both longitudi al nd tran versal direction were m asured and subsequently modeled using conventional statistical functions. This way a statistical odel of inclusion population i AISI 304 was create . The mod l forms a basis for the subsequent statisti al prediction f inclusion d stribution in fatigue speci ns and the correspo ding fatigu lives. The size and location distributions of th crack i itiating inclusions wer defin d bas d on the mod led inclusion popul tion and the stress distribution in the fatigue spec men, us ng the probabilistic Mont C rlo framework. The experimentally obtained information bout the corr lation betw en the siz a d location of th crack initiating inclusions and co responding fatigue liv s allows an ass ssment of fatigue life of the specimens corresponding to th modeled crack initi ting inclusions. Reasona le greement wa btained between modeling and exper ment l results. Anton Kolyshkin Siegen 57068, Germany In titut für Werkstoffwissenschaft, TU Dresden, Helmholtzstraße 7, Dresden 01062, Germany e n o e i a e e e a a s i t Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsi ility of the Scientific Committee of ECF21. P

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: austenitic stainless steel, AISI 304, inclusion distribution, very high cycle fatigue, fatigue life assessment

* Corresponding author. Tel.: +49 2717404627; fax: +49 2717402545 E-mail address: anton.kolyshkin@uni-siegen.de

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.139