PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1638–1643 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 Analysis of the energy dissipation in multiaxial fatigue tests of AISI 304L stainless steel bars Daniele Rigon, Vittoria Formilan, Giovanni Meneghetti* University of Padova, Department of Industrial Engineering, via Venezia 1 – 35131 Padova, Italy Abstract In the recent past, the specific heat loss per cycle (Q parameter) was used to synthesise in a single scatter band approximately 140 uniaxial fatigue test results obtained from constant amplitude, push-pull or torsional, stress- or strain-controlled fatigue tests on plain and notched AISI 304 L stainless steel specimens. It was also demonstrated that the Q parameter can be evaluated during a fatigue test by measuring the cooling gradient after a test stop at the hot spot region of the specimen surface. In the present contribution, the specific heat loss Q has been adopted for the first time to correlate the fatigue strength of AISI 304L specimens subjected to low-cycle multiaxial fatigue loadings. Completely reversed (R = -1) pure bending, pure torsion and combined bending and torsion t sts w re carried out on hourglass-plain specimens by using two serv hydraulic actuators. In-phase (  = 0°) as well as out-phase (  = 90°) multiaxial fatigue tests were performed by adopting two different biaxiality ratios. In addition, thin-walled tubula specime s were tested under comp etely reversed t nsion and t rsion fatigue loadings for comparative purpos s. Afterwards, all f tig e test results w re expressed in t rm of specific he t loss and compared with the sc tter band previously evaluated for plain and notched stainless-steel specime s subjected to uniaxial loading. In the LCF regime the scatter band relevant to uniaxial data correlated well the multiaxial fatigue data. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Auth rs. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Analysis of the energy dissipation in multiaxial fatigue tests of AISI 304L stainless steel bars Daniele Rigon, Vittoria Formilan, Giovanni Meneghetti* University of Padova, Department of Industrial Engineering, via Venezia 1 – 35131 Padova, Italy Abstract In the recent past, the specific heat loss per cycle (Q parameter) was used to synthesise in a single scatter band approximately 140 uniaxial fatigue test results obtained from constant amplitude, push-pull or torsional, stress- or strain-controlled fatigue tests on plain and notched AISI 304 L stainless steel specimens. It was also demonstrated that the Q parameter can be valuated during a fatigue test by measuring the cooling gradient after a test stop at the hot spot region of the specimen surface. In the present contribution, the specific heat loss Q has been adopted for the first time t correlate the fatigu strength of AISI 304L specim s subjec ed to low-cycle multi xial fatigue loadings. Completely reversed (R = -1) pure b ndin , pure torsion and combined bendi g and torsion tests were carried out on hourglass-plain specimens by using two servo hydraulic actuat r . I -phase (  = 0°) as well s o t-phase (  = 90°) multiaxial fatigue tests wer perfor ed by dopting two different biaxi lity ratios. In addition, thin-wall d tubular specimens wer tested under completely reversed tension a d or ion fatigue loadings for comparative pur oses. Aft rw rds, all fatigu test results w re expressed in t rm of sp cific heat lo s and compared with the scatter band previously evaluated for plain and n tch d stainless-steel specimens subjected to uniaxial loading. In the LCF regim the scatter band relevant to uniaxial data correlated well the multiaxial fatigue data. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Multiaxial fatigue; Energy-based method; Thermal energy, AISI 304L

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Multiaxial fatigue; Energy-based method; Thermal energy, AISI 304L

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +39 049 827 6751. E-mail address: giovanni.meneghetti@unipd.it * Corresponding author. Tel.: +39 049 827 6751. E-mail ad ress: giovanni.meneghetti@unipd.it

* 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 organizers.

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.2018.12.344