PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 118–125 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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. Copyright © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International C nference on Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Multibody simulation of a small size farming tracked vehicle Francesco Mocera a , *, Andrea Nicolini a a Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino - 10129, Italy Abstract In this p per, the Multibody (MTB) model of a small size tracked vehicle for farming applications is shown. These machines may encounter several working scenarios in their operating life when equipped with different working tools. Moreover, they are used in unstructured environments that are very difficult to predict in terms of terrain conditi ns and slope. Depending on these factors, the actual tractive force may vary a lot requiring often a high number of field tests to qualify the vehicle performance. The numerical model built in MSC ADAMS, wants to be a software environment where several working conditions can be exploited considering the dynamic properties of the vehicle. This work focuses on the global kinematic behavior, considering the difference between imposed motion laws and the actual one. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Multibody; Simulations; Tracked vehicle 1. Introduction In the design process of a complex mechanical system, numerical simulations are becoming more and more helpful thanks also to higher computational resources. In a software environment, it is possible to model real operating conditions that allows for exploiting the behavior of the system, reducing the amount of field tests required. This leads to a higher data availability since the early design stage and thus to higher optimization opportunities. To study its kinematic and dynamic behavior, a mechanical system can be seen as a group of rigid body connected to eth r with rotational, translational or more complex joints. Thus, the obtained multibody (MTB) AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Multibody simulation of a small size farming tracked vehicle Francesco Mocera a , *, Andrea Nicolini a a Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino - 10129, Italy Abstract In this paper, the Multibody (MTB) model of a small size tracked vehicle for farming applicatio s is shown. These machines may e counter several working scenarios in their operating life when equipped with different working tools. Moreov r, they are used in unstructured environments that are very difficult to predict in terms of terrain conditions and slope. Depending on these factors, the actual tractive for e may vary a lot requiring oft n a high number of fiel tests to qu lify the vehicle performance. The numerical model built in MSC ADAMS, wants to be a software environment where several working conditions can b exploited consid ring the dynamic properties of the vehicl . This work focuses on the global kinematic behavior, considering the difference between imposed motion laws and the actual one. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Multibody; Simulations; Tracked vehicle 1. Introduction In the design process of a co plex mechanical system, numerical simulations are becoming more and more helpful thanks also to higher computational resources. In a software environment, it is possible to model real operating conditions that allows for exploiting the behavior of the system, reducing the amount of field tests required. This leads to a higher data availability since the early design stage and thus to higher optimization opportunities. To study its kinematic and dynamic behavior, a mechanical system can be seen as a group of rigid body connected together with rotational, translational or more complex joints. Thus, the obtained multibody (MTB) © 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.

* Corresponding author. Tel.: +39 011 0906897; fax: +39 011 564 6999. E-mail address: francesco.mocera@polito.it * Correspon ing author. Tel : +39 011 0906897; fax: +39 011 564 6999. E-mail address: francesco.mocera@polito.it

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis.

* 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 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.013