PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Available o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1318–1325 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Application of the Effective Impulse Approach to Stairs Pedro Andrade a , José Santos b,c, *, Patrícia Escórcio b a University of Madeira (MSc Student), Portugal b University of Madeira, Faculty of Exact Sciences and Engineering, Department of Civil Engineering and Geology, 9020-105 Funchal, Portugal c CONSTRUCT-LABEST, Faculty of Engineering (FEUP), University of Porto, Portugal Abstract: One of the most commonly used simplified methods for predicting man induced vibrations in floors with high fundamental frequencies is the Effective Impulsive approach, first developed by the ARUP's company and later modified by the design guide SCI P354. Since the Effective Impulse approach was designed to be used in floors, its use in stairs can be arguable. To better understand the effectiveness of this method in stairs, in this paper are experimentally measured vibrations o a staircase with a poor dynamic behavior and then compared to the vibrations predicted using the Effective Impulse approach. The results indicate that this approach can be used, especially in the stair descends. The serviceability of the analyzed staircase was also verified by comparing the measured and predicted vibrations with the acceptable limits proposed by various authors and design guides. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Vibration Serviceability; Impulsive Response; Effective Impulse; Man induced vibrations; 1. Introduction Vibration serviceability is becoming an increasingly importa t research topic tha ks to pedestrian structures such as footbridges and monumental stairs that have failed, in full public view, to perform adequately under human dynamic loading. Depending on the type of dynamic response, structures can be divided into two categories, low and high frequency structures. Low frequency structures (LFS), as the name implies, are those whose fundamental frequency is low, while high frequency structures (HFS) are those whose fundamental frequency is high. The main difference between these two kinds of structures is that LFS respond harmonically with a resonant response and HFS respond 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Application f the Effective Impulse Approach to Stairs Pedro Andrade a , José Santos b,c, *, Patrícia Escórcio b a University of Madeira (MSc Student), Portugal b University of Madeira, Faculty of Exact Sciences and Engineering, D partment of Civil Engineering and Ge logy, 9020-105 Funchal, Portugal c CONSTRUCT-LABEST, Faculty of Engineering (FEUP), University of Porto, Portugal Abstract: On of the most commonly used simplified methods for predicting man induced vibrations in floors with high fundamental frequencies is the Effective Impulsive approach, first developed by the ARUP's company and later modified by the design ide SCI P354. Since the Effectiv Impulse approach was designed to be used in floors, its use in stairs can be argua le. To better understand the effectiveness of this method in stairs, in this paper are experimentally measur d vibrations on a staircase with a p or ynamic be avior and t en compared to the vibrations predicted using t Effe tive Impulse approach. The results indicate that this approach can be used, specially in the stair descends. T serviceability of the analyzed st ircase was also verified by comparing the measured and predicted vibrations with the acceptable limits proposed by various authors and design guides. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Vibration Serviceability; Impulsive Response; Effective Impulse; Man induced vibrations; 1. Introduction Vibration serviceability is becoming an increasingly important r search topic thanks to pedestrian structures such as footbridges and monumental stairs that have failed, in full public view, to perform adequately under human dynamic loading. Depending on the type of dynamic response, structures can be divided into two categories, low and high frequency structures. Low frequency structures (LFS), as the name implies, are those whose fundamental frequency is low, while high frequency structures (HFS) are those whose fundamental frequency is high. The main difference between these two kinds of structures is that LFS respond harmonically with a resonant response and HFS respond © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 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.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.140 * 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 Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: +351-291-705-197; fax: +351-291-705-249. E-mail address: jmmns@fe.up.pt * Corresponding author. Tel.: +351-291-705-197; fax: +351-291-705-249. E-mail address: jmmns@fe.up.pt