PSI - Issue 8

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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. 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 AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Injection molding. Influence of process parameters on mechanical properties of polypropylene polymer. A first study. E. Farotti a *, M. Natalini b a Ph.D. student, b JRF Department of Industrial Engineering and Mathematical Sciences (DIISM), Università Politecnica delle Marche, Ancona 60131, Italy Abstract This paper shows the first study results of the mechanical characterization of a commercial polypropylene (PP) polymer. Before testing, a mold for injection molding process has been designed and realized. Three different specimens can be produced, for three different tests: tensile, Charpy and Hopkinson bar. In-cavity pressure and temperature sensors are installed next to the molded item to have direct information about process phases. After the description of the instrumentation, the correlation between injection molding input parameters and mechanical behavior of the material has been assessed. In particular, tensile tests have been carried out to vestigate the influence of: melt temperature, mold temperatu e, packing pressure and cooling time. A Design of Experiment plan has been set up to e tablish the tests to be performed. Results show the influence f mold temperature and holding pressur on mechanical strength of the polymer. © 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: Injection Molding; Mechanical properties; Design of Experiments; Polypropylene; Mechanical characterization 1. Introduction Polypropylene is a common thermoplastic polymer, largely used in industrial applications for the number of its propertie , which make it versatil . PP components are semi-rigid, transl cent, fatigue and heat resistant, tough and AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Injection molding. Influence of process parameters on mechanical properties of polypropylene polymer. A first study. E. Farotti a *, M. Natalini b a Ph.D. student, b JRF Department of Industrial Engineering and Mathematical Sciences (DIISM), Università Politecnica delle Marche, Ancona 60131, Italy Abstract This paper shows the first study results of the mechanical char cteriz tion of a commercial polypropylene (PP) polymer. Befor testing, a mold for injection molding proce s has been designed and realized. Three different sp c mens ca be produced, for three different tests: tensile, Charpy and H pkinson bar. In-cavity pressure a d temperature s sors are installed next to the molded i em to have direc infor ation about process phases. After the description of the in trument tion, the correla ion between inject on molding input parame ers and m chanical b hav or of the materi l has been assessed. In particular, tensile test have been carried out to investigat the influence of: melt temperatur , mold temperature, packing pressure and cooling time. A Design of Experiment plan has been set up o establish the tests to be performed. Results show the influence of mold temperature and holding pressure on mechanical strength of the polymer. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: Injection Molding; Mechanical properties; Design of Experiments; Polypropylene; Mechanical characterization 1. Introduction Polypropylene i a common thermo lastic polymer, largely used i industrial applications for the number of its properties, which make it versatile. PP components are semi-rigid, translucent, fatigue and heat resistant, tough and © 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.: +39-3348184681 E-mail address: e.farotti@pm.univpm.it * Correspon ing author. Tel.: +39-3348184681 E-mail address: e.farotti@pm.univpm.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.2017.12.027