PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 1 4–111 Available online at www.sciencedirect.com ScienceDirect Structural 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 Th Authors. P blished by Elsevi r B.V. This is an open access article under the CC BY-NC-ND lice se (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 Coupled Crystal Plasticity-Phase Field Modeling of Multi-Phase Metals Ritesh Dadhich, Alankar Alankar* Department of Mechanical Engineering, IIT Bombay, Powai, Mumbai, Maharashtra 400076, India Abstract A code has been developed based on image based crystal plasticity modeling of multiphase metals. This model coupled with equilibrium equation and compatibility constraint is solved at each material point of representative volume element. A phenomenological equation for dislocation slip is used. Crystal kinematics couples the boundary conditions to constitutive behavior by integrating evolution equation for elastic deformation gradient obtained using the multiplicative decomposition of deformation. The code is tested for linear homogeneous isotropic elastic material with embedded inclusions. We analyze two types of inclusions namely an elastic inclusion and a void. These two baseline studies have been compared against solutions from currently available commercial and open source packages. In the second example we study the time evolution of residual stresses due to a growing phase. Such models are especially useful for understanding the role of interactions and co-deformation of multiple phases on the overall mechanical response of a multiphase metal. Experimental data set found in the literature is used for calibration of the devel ped crystal plasticity model. © 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. Keywords: Crystal Plasticity, Micromechanics, Dislocations, CPFFT, ICME 1. Introduction Most of the mat rials having technolog cal impor ance have a polycrystalline or multiphase structure with some complexity in spatial arrangement of microstructure features. In order to predict the stress-strain behavior of 2nd International Conference on Structural Integrity and Exhibition 2018 Coupled Crystal Plasticity-Phase Field Modeling of Multi-Phase Metals Ritesh Dadhich, Alankar Alankar* Department of Mechanical Engineering, IIT Bombay, Powai, Mumbai, Maharashtra 400076, India Abstract A code has been developed based on image based crystal plasticity modeling of multiphase metals. This model coupled with equilibrium equation and compatibility constraint i solved t each material oint of representative v lume element. A phenomenological equation for dislocation slip i used. Crystal kinematics couples the boundary cond tions t constitutive b havior by integrating evolution equation f r elastic deformation grad ent obtained using the multiplicative decomposition of deformation. The code is test d for linear homogene us isotropic elastic material with mbedded inclusions. We analyze two types of inclusions na ely an el stic inclusion and a void. Thes two bas line studies have be n compared against ol tions from c rrently available commercial and open source package . In the second example w study the time evolution of residual stresses due to a growing p ase. Such models are especially useful for understanding th role of interactions and co-deformation f multiple phases n th v rall mechani al respons of a multiphase metal. Experimental data set found in the literature is used f r calibration of the developed crystal plasticity model. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Crystal Plasticity, Micromechanics, Dislocations, CPFFT, ICME 1. Introduction Most of the materials having technological importance have a polycrystalline or multiphase structure with some complexity in spatial arra gement of microstructure features. In order t predict the stress-strain behavior of © 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.: +91-22-2576-9356; fax: +91-22-2572-6875. E-mail address: alankar.alankar@iitb.ac.in * Correspon ing author. Te .: +91-22-2576-9356; fax: +91-22-2572-6875. E-mail address: alankar.alankar@iitb.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 a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-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.2019.05.014