PSI - Issue 13

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 13 (2018) 1111–1116 Structural Integrity Procedia 00 (2018) 000 – 000 Structural Integrity 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 Development of dynamic mesh superposition method for local tensile stress evaluation Kota Kishi a* , Kazuki Shibanuma a , Fuminori Yanagimoto a , Katsuyuki Suzuki b , Toshiyuki Matsumoto c a Department of Systems Innovation, the University of Tokyo. 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan b Research into Artifacts, Center for Engineering, 5-1-5, Kashiwano-ha, Chiba, Japan c Research Institute, Nippon Kaiji Kyokai, 3-3, Kioi-cho, Chiyoda-ku, Tokyo, Japan The brittle crack propagation and arrest behavior has been studied for a long time. The critical condition is not completely clear, but the local fracture stress criterion is recently regarded as a m st promising description of brittle crack propagation and arrest behavior. Although accurate finite element analyses should be employed to obtain the local stresses, it is not realistic to use conventional finite element analyses because computational cost is too high. According to the above background, we focused on mesh superposition method to cope with both reduction of computational cost and improvement of local stress evaluation accuracy. At first, stationary crack problem is solved and it is shown that results agree with conventional solutions, and verified the availability of this method. Th n this method is used for dynami crack propagation and it is verified that mesh superposition method is also applicable to dynamic crack growth. © 2018 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: mes superposition method; dynamic crack pr pagation; 1. Introduction In order to ensure safety of large steel structures against brittle fracture, the crack arrestability is important as well as the resistance of crack initiation. There have been a lot of studies on brittle crack propagation and arrest behavior in steels because of engineering importance. Recently, the local tensile stress in the vicinity of the crack tip has been regarded as the most promising parameter to govern the crack behavior as pointed by the numerical model developed by Shibanuma et al (Shibanuma et al., 2016a; Shibanuma et al., 2016b). This is called as the local fracture stress criterion, and supported by the experimental studies by Yanagimoto et al (Yanagimoto et al., 2018). Therefore, © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Development of dynamic mesh superposition method for l cal tensile stress evaluation Kota Kishi a* , Kazuki Shibanuma a , Fuminori Yanagimoto a , Katsuyuki Suzuki b , Toshiyuki Matsumoto c a Department of Systems Innovation, the University of Tokyo. 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan b Research into Artifacts, Center for Eng neering, 5-1-5, Kashiwano-ha, Chiba, Japan c Research Institute, Nippo Kaiji Kyokai, 3-3, Kioi-cho, C iyoda-ku, Tokyo, Japan Abstract The brittle crack propagation and arrest behavior has been studied for a long time. The critical condition is not completely clear, but the local fracture stress criterion i rec ntly regard d a a most promisi g description of brittle crack propagation and arrest ehavior. Although accurate finite elem nt analyses should be em loyed to obtain the l cal str sses, it is not realistic to use conventional finite element analys s because computational cost is to high. According to the above background, we focused on mesh superposition m thod to cope with both reduction of computational cost and improvement of local stress evaluation accuracy. At fir , sta i nary crack problem is solved and it is sh wn that results agree with conventional soluti ns, and verified the availability of thi meth d. Then this method i used for dynamic crack propagation and it is verified that mesh superpos tion m thod is also applicabl t ynamic crack growth. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th ECF22 organiz rs. Keywords: mesh superposition method; dynamic crack propagation; 1. Introduction In order to ensure safety of large steel structures against brittle fracture, the crack arrestability is important as well as the resistance f crack initiation. There have been a lot of studies on brittle crack propagation and arrest behavior in steels because of engineering importance. Recently, the local tensile stress in the vicinity of the crack tip has been regarded as the most promising param ter o govern the crack behavior as poi ted by the numerical model developed by Shibanuma et al (Shibanuma et al., 2016a; Shibanuma et al., 2016b). This is called as the local fracture stress criterion, and s pported by the experimental studies by Yanagimoto et al (Yanagimoto et al., 2018). Therefore, © 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. Abstract

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 organizers.

* 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 PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.233