PSI - Issue 14

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 Structu al Integrity 14 (2019) 612–618 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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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.2019.05.075 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. * Corresponding author. Tel.: +91-22-2576-9356; fax: +91-22-2572-6875. E mail address: alankar.alankar@ itb.ac.in 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 Formation of GNDs in copper single crystal under pure bending considering planar double slip B V S S Bharadwaja, Alankar Alankar* Departm nt of Mechanic l Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India Abstract In the present work a finite strain non-local crystal plasticity model is implemented via UMAT in ABAQUS TM . The main objective of this work is to study the distribution of geometrically necessary dislocations in pure bending. Ashby (1969) with his hypothesis showed that the gradient of strains caused by inhomogeneous deformation plays a major role in the mechanical behavior of crystals. In this work we study the evolution of geome rically necessary dislocations (GNDs) in case of pure bending of Cu single crystals. In the present work we develop a crystal plasticity model considering the evolution of GNDs. For verification of current implementation, we have used a planar double slip model of FCC crystals derived by Asaro (1979). We show that in the absence of screw dislocations the total GNDs are in form of only edge type dislocations. The distribution of statistically stored dislocations (SSDs), GNDs and their components are in good agreement with Dai (1997). © 2018 The Aut ors. Publish d by Elsevier B.V. This is an open access art le und r the CC BY-NC-ND license (https://cr ativecommons.org/licens s/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Strain gradient plasticity; GNDs; pure bending; 1. Introduction Based on the concept of origin, dislocations can be categorized into two types viz. statistically stored dislocations (SSDs) and geometrically necessary dislocations (GNDs). SSDs are generated during plastic deformation by mutual 2nd International Conference on Structural Integrity and Exhibition 2018 Formation of GNDs in copper si gle crystal under pure bending considering planar double slip B V S S Bharadwaja, Alankar Alankar* Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India Abstract In the present work a finite strain non-local crystal plasticity model is implemented via UMAT in ABAQUS TM . The main objective of this work is to study the distribution of geometrically necessary dislocations in pure bending. Ashby (1969) with his hypothesis showed tha the gr dient of strains caused by inh mogeneous d formation plays a major role in the mechanical behavior of crystals. In this work we study the evolution of geometrically necessary dislocations (GNDs) in case of pure bending of Cu single crystals. In the present work we develop a crystal plasticity model considering the evolution of GNDs. For verification of current implementation, we have used a planar double slip model of FCC crystals derived by Asaro (1979). We show that in the absence of screw dislocations the total GNDs are in form of only edge type dislocations. The distribution of statistically stored dislocations (SSDs), GNDs and their components are in goo agreem nt with Dai (1997). © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativ commons.org/licenses/by-nc-nd/4.0/) S lection and peer-r view under responsibility of Peer-review u der responsibility of the SICE 2018 organizers. Keywords: Strain gradient plasticity; GNDs; pure bending; 1. Introduction Based on the concept of origin, dislocations can be categorized into two types viz. statistically stored dislocations (SSDs) and geom trically necessary dislocations (GNDs). SS s ar gener ted during plastic deformation by mutual © 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt * Corresponding author. Tel.: +91-22-2576-9356; fax: +91-22-2572-6875. E-mail address: alankar.alankar@iitb.ac.in