PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 215–225 Available online at www.sciencedirect.com ScienceDirect Structura Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Filler Functionalization on the Thermo-Mechanical behavior of Polypropylene Nanocomposites Vivek Khare a, *, Shubham Srivastava b , Sudhir Kamle c , G.M.Kamath d , a Ph.D. Student, b M.Tech Student, c Professor, d Assosiate Professor Department of Aerospace Engineering, IIT Kanpur, Kanpur 208016, India Abstract Present study is an experimental attempt to characterize the thermo-mechanical behavior of Thermoplastic polymer nanocomposites (PNC) surface functio alized with m lti walled carbon nanotubes (MWCNT). Nanocomposites with two grades of MWCNT, pristine and – COOH functionalized were fabricated with isotactic polypropylene (iPP) and results were compared. Nanocomposites Films with 0%, 0.5%, 1% and 2% MWCNT loadings were prepared by conventional solution casting method followed by isothermal quasi static uniaxial tensile tests at constant strain rates of 0.1/min, cyclic tensile tests at strain rate of 0.1/min and isochronous creep characterization at stress levels of 0.2, 0.5, 1, 2, 5, 7, 10, 12 and 15 MPa performed on Tinius Olsen Universal Testing machine to monitor strength and stiffness of the material and obtain the threshold of stress and time at room temperature to observe the transition from linear to nonlinear viscoelastic regime. Dynamic characterization at constant frequency of 1 Hz, temperature ramp 0-100°C, was performed to obtain storage modulus under dynamic loading conditions on Dynamic mechanical analyzer (DMA). It was reported that incorporation of functionalized MWCNT increases the strength, failure strain, reduces creep strain and increases stiffness of nanocomposites as compared to those with pristine-MWCNT up to 1% concentration. Moreover, it was also observed that loading under 1MPa and 5 seconds, the material behaves linearly. Prior to the testing, thermal stability of materials was monitored by Thermo-gravimetric analysis. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Effect of Filler Functionalization on the Thermo- echanical behavior of Polypropylene Nanocomposites Vivek Khare a, *, Shubham Srivastava b , Sudhir Kamle c , G.M.Kamath d , a Ph.D. Student, b M.Tech Student, c Professor, d Assosiate Professor Department of Aerospace Engineering, IIT Kanpur, Kanpur 208016, India Abstract Present study is an experimental attempt to characterize the thermo-mechanical behavior of Thermoplastic polymer nanocomposites (PNC) surface functionalized with multi walled carbon nanotubes (MWCNT). Nanocomposites with two grades of MWCNT, pristine and – COOH functionalized were fabricated with isotactic polypropylene (iPP) and results were compared. Nanocomposites Films with 0%, 0.5%, 1% and 2% MWCNT loadings were prepared by conventional solution casting method followed by isothermal quasi static uniaxial tensile tests at constant strain rates of 0.1/min, cyclic tensile tests at strain rate of 0.1/min and isochronous creep characterization at stress levels of 0.2, 0.5, 1, 2, 5, 7, 10, 12 and 15 MPa performed on Tinius Olsen Universal T sting machine to monitor stre gth and stiffness of the material a d obtain the threshold of st ess and time at room temperature to ob erv he transition from linear to onl near vi coela tic regime. Dynamic characterization at constant frequency of 1 Hz, temperature ramp 0-100°C, was performed to obtain storage modulu und r dynamic loading conditions on Dynamic mechanical analyzer (DMA). It was report d that incorporation of functionalized MWCNT increases the strength, failure strain, reduces creep strain and increases stiffness of nanocomposites as compared to those with pristine-MWCNT up to 1% concentration. Moreover, it was also observed that loading under 1MPa and 5 seconds, the material behaves linearly. Prior to the testing, thermal stability of materials was monitored by Thermo-gravimetric analysis. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Polymer nanocomposites; Functionalization; Creep; Linear viscoelasticity; Dynamic testing Keywords: Polymer nanocomposites; Functionalization; Creep; Linear viscoelasticity; Dynamic testing

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

* Corresponding author. Tel.: +91-512-259-7853 E-mail address: vivekkh@iitk.ac.in * Corresponding author. Tel.: +91-512-259-7853 E-mail address: vivekkh@iitk.ac.in

2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers.

* 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  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.028