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) 2048–2 52 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 A microstructure sensitive modeling approach for fatigue life prediction considering the residual stress effect from heat treatment Chao Gu a,b , Junhe Lian b,c,d *, Yanping Bao a , Sebastian Münstermann b a State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China b Steel Institute, RWTH Aachen University, Intzestraße 1, Aachen 52074, Germany c Impact and Crashworthiness Lab, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA d Department of Mechanical Engineering, Aalto University, Otakaari 4, 02150 Espoo, Finland A multiscale numerical method to study the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of bearing steels is proposed in this study. The method is based on the microstructur sensitive modeling approach resulting from the integrated computational materials ensfginerrring concept, and further consider the effect of residual stress generated from the prior heat treatment processes. The microstructure features, including the grain size and shape distribution and inclusion size and shape description, are represented by the representative volume element (RVE) models. The matrix mechanical response to the cyclic loading is described by the crystal pl sticity (CP) model. The CP material parame er set is calibrated inversely based on the stra n controlled low cycle fatigue tests. The results show that the residual stre ses, especially those around the inclu i n, have a great effect on the fatigue propertie , which provi s the key factor to giv the correct prediction of the fatigue crack initiation site. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue life; modeling; residual stress; microstructure © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity A microstructure sensitive modeling approach for fatigue life prediction considering the r sidual stress effect from heat treatment Chao Gu a,b , Junhe Lian b,c,d *, Yanping Bao a , Sebastian Münstermann b a State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China b Steel Institute, RWTH Aachen University, Intz straße 1, Aachen 52074, Germany c Impact and Crashworthiness Lab, Depar m nt of Mech nical E gineering, Mass chusetts Institute of Technology, Cambridge, MA 02139, USA d Department of Mechanical Engineering, Aalto Univer ity, Otakaari 4, 02150 Espo , Finland Abstract A multiscale numerical method to study the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of bearing steels is proposed in this study. The method is based on the microstructur sensitive modeling approach resulting from the integrated computati nal material ensfginerrring concept, and further c nsider the effect of residual stress generated fro t prior heat treatment processes. The microst ucture features, incl ding the grain size and shap istribution and inclusion size and shape d scription, ar represented by the repr sentative volume elem nt (RVE) model . The matrix mechanical re ponse to the cyclic loading is described by th crystal plasticity (CP) m del. The CP material parameter set is calibrat d inversely based on t strain c ntrolled low cycle fatigue tests. The results show that the residu l stresses, especially those round the inclusion, have a great effect on the fatigue properti s, which provides th key fact r to give the correct rediction f the fatigue cra k initiation site. © 2018 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the ECF22 organizers. Keywords: fatigue life; modeling; residual stress; microstructure © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Fatigue life is an important mec ani al property to many kinds of materials, especially to those used in the safety relevant parts of engineering structures in various industrial sectors, e.g. automotive, aerospace, and railroad. To ensure the reliability and safety of these facilities, the d and on quality of materials has been steadily increased. Extensive Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Fatigue life is an important mechanical property to many kinds of materials, especially to those used in the safety relevant parts of engin ering structures in various industrial sectors, e.g. automotive, aerospace, and railroad. To ensure the reliability and safety of these facilities, the demand on quality of materials has been steadily increased. Extensive Abstract 1. Introduction 1. Introduction

* 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 o ganizers. * Corresponding author. Tel.: +49-241-8092912; fax: +49-241-8095553. E-mail address: junhe.lian@iehk.rwth-aachen.de, lianjh@mit.edu * Corresponding author. Tel.: +49-241-8092912; fax: +49-241-8095553. E-mail ad ress: junhe.lian@iehk.rwth-aachen.de, lianjh@mit.edu

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.2018.12.210