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) 537–543 Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 ScienceDirect

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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.2019.05.064 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. 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 Ductile fracture in tube impact problem using a Lode angle dependent failure criterion Dipankar Bora a , Manoj Kumar b , Sachin S. Gautam a a Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India b Department of Mechnical Engineering, Dr. B. R. Ambedkar National Institute of Technology Jalandhar, Jalandhar, 144011, India Abstract Impact problems are an important class of problems usually accompanied by large deformations and sometime fracture of the impacting bodies. In many fields such automotive crashworthiness analysis and design, turbine design, metal forming problems etc. one has to invariably consider the possibility of fracture and study its effect on the component/structure. Fracture in these applications is mostly happens after considerable plastic deformation and is referred to as ductile fracture . A lot of research work has being carried out in the area of ductile fracture under impact loads. Recently, a new coupled elasto-plastic damage model for ballistic applications incorporating effect of Lode angle in the Johnson and Cook failure criterion using a Lode angle dependent function has been proposed. In the present work, this model is employed to study the ductile fracture of tubes impacted against a rigid surface using Abaqus/Explicit through a user input subroutine VUMAT. The effect of Lode angle on the fracture pattern is studied. It is shown that the L angle significantly affects the failure patt rn. © 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: Impact; Ductile fracture; Lode angle; Jhonson-Cook model; Abaqus/Explicit 1. Introduction Study of impact problem has applications in various engineering fields like defense, automobile, aerospace etc. Some characteristic f at es of th impact prob s ar large plastic deformation, rapid dissipation of energy, short duration, thermal softening etc. An impact problem often involves fracture, mostly ductile, since most of the 2nd International Conference on Structural Integrity and Exhibition 2018 Ductile fracture in tube imp ct problem using a Lode angle dependent failure criterion Dipankar Bora a , Manoj Kumar b , Sachin S. Gautam a a Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India b Department of Mechnical Engineering, Dr. B. R. Ambedkar National Institute of Technology Jalandhar, Jalandhar, 144011, India Abstract Impact problems are n important class f problems usually ccompanied by large deformatio s and sometime fracture of th im a ting bodies. In m ny fields su h automotive crashworthiness analysis and design, turbine design, metal f rming problems etc. one has to invariably consider the possibility of fracture and study its effect o the component/structure. Fracture in these applications s m stly hap ens after considerable plastic deformation a d is referred to as ductile fracture . A lot of research work has ei g carri d out in the area of ductile fracture under impact loads. Recently, a new oupled elast -plastic damag model for ballistic applications incorporating effect of Lod a gle in the Johnson and Cook failure criterion using a Lode ngle dependent functio has been proposed. In the present work, his model is employed to study the ductile fracture of tubes imp cted against a rigid surface using Abaqu /Explicit through a user inp t subrou ne VUMAT. The effect of Lode angle on the fracture patter is studied. It is sh wn that the Lode angle significantly aff cts the failure pattern. © 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-revi w und r respo sibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Impact; Ductile fracture; Lode angle; Jhonson-Cook model; Abaqus/Explicit 1. Introduction Study of i pact problem has applications in various engineering fields lik defense, a tomobile, aerospace etc. Some characteristic features of the impact problems are large plastic deformation, rapid dissipation of energy, short duration, thermal softening etc. An impact problem often involves fracture, mostly ductile, since most of the © 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