PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1932–1939 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect 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 Determination of Combined Hardening Parameters to Simulate Deformation Behavior of C(T) Specimen under Cyclic Loading Ho-Wan Ryu a , Hune-Tae Kim a , Yun-Jae Kim a, *, Jin-Weon Kim b a Department of Mechanical Engineering, Korea University, Anam-Dong 5-Ga, Seongbuk-Gu, Seoul 136-701, Republic of Korea b Department of Nuclear Engineering, Chosun University, Seosuk-Dong, Dong-Gu, Gwangju 501-759, Republic of Korea Abstract Cy lic hardening rule is important to simulate deformation behaviors in low cycle fatigue analysis. Due to a complexity of cyclic hardening, it is hard to predict deformation of components accurately. Also, in the case of a cracked problem, severe deformation occurs in the region of crack front. To perform low cycle fatigue analysis and predict deformation behaviors, the type of cyclic hardening rule should be determined. In this study, the determination procedures of combined hardening parameters (Chaboche model) are described briefly and the effects of two parameters on deformation behavior are analyzed. Combined hardening parameters are determined from each hysteresis loop with different strain amplitudes. The xperiment data from two different materials (SA312 TP316 stainl ss steel and CF8A cast austenite stainless steel) and two differ nt load ratios (R=-0.5 and -0.1) are us d for simulations. In addition, hysteresis loops from three strain amplitudes are used to explain how th parameters from different strain amplitudes can influence on deformations of cyclic C(T) simulation. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Low cycle fatigue, C(T) specimen, Deformation, Combined hardening rule, Cyclic loading, Strain amplitude © 2018 The Aut ors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Determination of Combined Hardening Parameters to Simulate Deformation B havio of C(T) Specimen under Cyclic Loading Ho-Wan Ryu a , Hune-Tae Kim a , Yun-Jae Kim a, *, Jin-Weon Kim b a Department of Mechanical Engineering, Korea University, Anam-Dong 5-Ga, Seongbuk-Gu, Seoul 136-701, Republic of Korea b Department of Nucle r Chosun University, Seosuk-Dong, Dong-Gu, Gwangju 501-759, Republic of K rea Abstract Cyclic hardening rule is important to simulate deformation behaviors in low cycle fatigue analysis. Due to a complexity of cyclic hardening, it is hard to pr dict deformation of components ac urately. Also, in the case of racked problem, severe formation occurs in the region of crack front. T perform low c cle fatigue analy is and predict def rmation b haviors, the type of cyclic ard ning rule should be determined. In this study, the determination ocedur s of combined hardening parameters (Chaboche model) ar described briefly an the effects of two arameter n deformation b havior are analyzed. C mbined hardening paramete s are determined from each hyster sis lo p with different strain amplitudes. The experim nt data from two diff rent mat rials (SA312 TP316 stainless steel and CF8A cast austenite stainl ss ste l) and two different load ratios (R=-0.5 a d -0.1) are used for imulations. In a dition, hysteresis loop from thre str in amplitud s are used to explain how the param ters from different strai mplitudes can influence on deformations of cyclic C(T) simulation. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Low cycle fatigue, C(T) specimen, Deformation, Combined hardening rule, Cyclic loading, Strain amplitude

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Structural integrity of piping system under cyclic loading is an important issue for power plants and energy industry. Under a cyclic loading condition, materials and structures experience repeated tensile and compressive load and show Structural integrity of piping system under cyclic loading is an important issue for power plants and energy industry. Under a cyclic loading condition, mat rials and structur s experienc repeated tensile and compressive load and show

* 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. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 organizers. * Corresponding author. Tel.: +82-2-3290-3372; fax: +82-2-929-1718. E-mail address: kimy0308@korea.ac.kr * Corresponding author. Tel.: +82-2-3290-3372; fax: +82-2-929-1718. E-mail ad ress: kimy0308@korea.ac.kr

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.2018.12.268