PSI - Issue 5

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 Structu al Integrity 5 (2017) 332–339 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 Dynamic Tests for Assessment of Pedestrian Comfort for Design of a Stayed Highway Bridge C.A. Prato a, *, F. Pinto b,d , M.A. Ceballos b,d , A.M. Prato c , C.F. Gerbaudo c a Emeritus Prof. of Struct. Engrng., National University of Córdoba, Argentina b Prof. of Struct. Engrng., National University of Córdoba, Argentina c Assis. Prof. of Struct. Engrng., National University of Córdoba, Argentina d National Council of Scientific and Technical Research (CONICET), Argentina Assessment of the performance of a road bridge for pedestrian comfort at design stage is often carried out following simplified rules defined by design codes of practice. The purpose of this paper is to assess the effectiveness of one such simplified procedure by means of actual dynamic load tests carried out on an unconventional cable-stayed bridge with precast pre-stressed deck and solid section 47 mm diameter steel bars acting as tension members in lieu of specific traditional strand cable systems. The rule given by the Spanish Design Code (IAP- 11, “ Instrucción sobre las acciones a considerar en el proyecto de puentes de carretera ”, 2011) is taken as the basic design requirement to be assessed by a series of time records of the vertical acceleration caused by passage of the control vehicle. The tests consisted on recording vertical component of accelerations at the mid-span section where the stays converge just outside of the pedestrian sidewalk. The control or reference vehicle used for the tests conforms to the requirements described in the Spanish IAP-11 Code. The focus of the paper is to establish a direct comparison between the code prescribed analyses of the structure under the reference vehicle to evaluate pedestrian comfort according to IAP-11. Computed maximum accelerations at the mid-span section are found to be approximately one half of the measured values, fact that is at least partially attributed to ignoring the inertial mass and mechanical characteristics of the reference truck that does not allow for vehicle structure interaction. 2nd International Conference on Structural Integrity ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Dynamic Tests for Assessment of Pedestrian Comfort for Design of a Stayed Highway Bridge C.A. Prato a, *, F. Pinto b,d , M.A. Ceballos b,d , A.M. Prato c , C.F. Gerbaudo c a Emeritus Prof. of Struct. Engrng., N tional Un versity of Córdoba, Argentina b Prof. Struct. Engr ., National University of Córdoba, Argenti a c Assis. Pr f. of Struct. Engrng., National University of órdoba, Argenti a d National Council of Scientific and Technical Research (CONICET), Argentina Abstract Assessment of the performance of a road bridge f r pedestrian comfort at design stage is often carri d out following simplified rules defined by design codes f practice. Th purpose of this pap r is to assess the effectiveness of on such simplified pro edure by means f actual dyna ic load tests carried out o an unconv ntional cable-stayed bri ge with precast pr -stressed deck and solid section 47 mm diameter ste l bars acting as tension members in lieu of specific traditional strand cable systems. The rule given by the Spanish Design Code (IAP- 11, “ Instruc ión sobre las acciones a considerar en el proyecto e puentes de carretera ”, 2011) is taken as the basic design r quirement to be assessed by a series of time records of the vertical acceleration caused by passage of the control vehicle. The tests con isted on recording vertical component of accelerations at the mid-span section wher the stays converge just outside of the pedestrian sidewalk. The control or reference ve icle used for the tests conforms to the requirements described in the Spanish IAP-11 Code. The focus of the paper is to establish a direct comparis n between the code prescribed analyses f the structure under the ref rence vehicle to evalu t pedestrian comfort ccording to IAP-11. Computed maximum accel rations at the mid-span section are found to be approximately one half of th measured values, fact that is at least partially attributed to ignoring the inertial mass and mechanical characteristics of the reference truck that does not allow for vehicle structure interaction. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsib lity of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Com ittee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: pedestrian comfort predictions; dynamic load tests; cable-stayed highway bridges; design code requirements Keywords: pedestrian comfort predictions; dynamic load tests; cable-stayed highway bridges; design code requirements

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.2017.07.179 * 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.: +54-351-5353800 (int. 713); Fax: +54-351-4334144. E-mail address: prato_carlos@yahoo.com * Corresponding author. Tel.: +54-351-5353800 (int. 713); Fax: +54-351-4334144. E-mail address: prato_carlos@yahoo.com