PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 251–258 ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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.2019.05.032 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 Th 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: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction Recrystallization is a phenomenon that involves the formation of a new set of strain free grains at heterogeneities in the microstructure of a material during hot working. These new grains subsequently grow and consume the parent 1. Introduction Recrystallization is a phenomenon that involves the formation of a new set of strain free grains at heterogeneities in the microstructure of a material during hot working. These new grains subsequently grow and consume the parent * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 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/) Selec io and pe r-review under responsibility of Peer-review under responsibility of the SICE 2018 organiz s. 2nd International Conference on Structural Integrity and Exhibition 2018 Crystal Plasticity modeling of dynamic recrystallization in CP Ti Ritam Chatterjee, Alankar Alankar* Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Mumbai – 400076, India Abstract The present work is an attempt at modeling the phenomenon of dynamic recrystallization (DRX) in commercial purity α -titanium. DRX is associated with increase in number of grains along with loss of strength. Thus it is critical to understand its occurrence while structural metal components and parts are processed. A dislocation density hardening based approach accounts for the occurrence of DRX subject to achieving a critical value of dislocation density for each grain. A model describing nucleation and probability of RX is integrated i to a polycrystal plasticity framework. Only slip deformation modes are considered. In the present work, multiple parametric studies have been carried out. The forma ion of new DRX grains with deformation has been highlighted. Due to applying a probabilistic criterion for addition of new DRX grains, this number is less than the number of grains having dislocation density more than critical value that is required for occurrence of DRX. The average dislocation density over all grains has been shown to decrease with deformation due to nucleation of new grains. A modified algorithm for modeling dynamic recrystallization has henceforth been demonstrated for CP Ti via evolution of flow stress, dislocation density and grain weights of ‘old’ and ‘new’ grains with deformation. © 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, titanium, dislocation theory, ICME, DRX 2nd International Conference on Structural Integrity and Exhibition 2018 Crystal Plasticity modeling of dynamic recrystallization in CP Ti Ritam Chatterjee, Alankar Alankar* Department of Mechanical Engineering, Indian Institute of Technology, Bombay, Mumbai – 400076, India Abstract T e present work is n attempt at modeling the phenom non of dynamic recrystallization (DRX) in commercial purity α -titanium. DRX is associated with increase in number of grains al ng with loss of strength. Thus it s critical to unde sta d its occurrence while structural metal components nd parts are processed. A dislocation density hardening based approach accounts for the occurrence of DRX subject to achie ing a critical val e of disloc de sity for each grain. A m del describing nucleation and probability of DRX is integrated into a polyc ystal plasticity framework. Only slip deformation modes ar considered. In the present work, multiple para etric studies h ve be n c rried o t. The formation of new DRX grains with eformation ha been high i hted. Due to applying a probabilistic criteri n for addition f new DRX grains, this number is less than the number f grains having dislocation density more than critical value that is required for occurrence of DRX. Th average dislocation de sity over all grains has been s o n to decrease with deformatio due t nucleation of new grains. A modified algorithm for modeling dy amic recrystallization has henceforth been demonstrated for CP Ti via evolution of flow stress, dislocation density and grain weights of ‘old’ and ‘new’ grains with deformation. © 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/) S lection 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. * Corresponding author. Tel.: +91-22-25769356; E-mail address: alankar.alankar@iitb.ac.in Keywords: Crystal plasticity, titanium, dislocation theory, ICME, DRX * Corresponding author. Tel.: +91-22-25769356; E-mail address: alankar.alankar@iitb.ac.in