PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 491–498 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 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/license /by-nc-nd/4.0/) Sel ctio and peer-review under responsibility of Peer-review under responsibility of t e SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Numerical study on the residual stress distributions in GTA welded dissimilar metal components Ch. Vijay Sai*, Satish K.Velaga, Biswanath Sen, B.P.C Rao, A. Ravisankar IGCAR, Kalpakkam 603102, India Abstract Residual stresses are inherently self-balanced stresses that arise due to non-uniform development of Eigen strains during processes like welding. Tensile residual stress in weld joints have a detrimental effect on the structural integrity and life of an engineering component, Accurate estimation and minimization of residual stress is a pre-requisite to qualify a component for durable service in severe environments e.g. in nuclear power plants. Dissimilar weld joints are fabricated to provide the structural and functional continuity whenever equipment in a process line is fabricated. A typical and relevant example is the weld joint between Modified 9Cr-1Mo steel (P91) and AISI type stainless steel 304 which finds application in nuclear power plants and proce s industries. Computer aided numerical simulation provide detailed information of the magnitude and distribution of residual stress in the component. This paper describes a numerical study carried out for evaluation of residual stress occurring in dissimilar butt weld joints between P91 and SS304 plates and circumferentially welded pipes. This covers sequential coupled thermo-metallurgical and mechanical FEM time-step analysis using three-dimensional models. Th model predicted residual stresses are compared ith residual stresses in weld joints of P91 and SS304. © 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: Dissimilar Welding; FEM; P91; SS304. 2nd International Conference on Structural Integrity and Exhibition 2018 Numerical study on the residual stress distributions in GTA welded dissimilar metal components Ch. Vijay Sai*, Satish K.Velaga, Biswanath Sen, B.P.C Rao, A. Ravisankar IGCAR, Kalpakkam 603102, India Abstract Residual stresses are inh rently elf-balanced stresses that aris du to non-uni orm dev lopment of Eigen strains during pro esses like welding. Tensile r sidual stress in weld joints have a detrimental effect on the structural integrity and life of an engine ring omponent, Accurate s imatio and minimization of residual stress is a pre- quisite o qualify a componen for durable service in severe environments e.g. in nuclear p wer plant . Dissimilar weld joints are fabrica ed to prov de the structural and fu ctional continuity when ver equipment in a rocess ine is fabricated. A typical and relevant example is the weld joi t betw en Modif d 9 r-1Mo steel (P91) and AISI type stainless steel 304 which finds application in n cl ar power plants and process indu tries. Co puter aided num ical simulation provide detailed inf rmation of the magnitu e and distrib tion of re idua stress in the c mpon nt. This paper describes a num rical st dy carrie out fo valuation of residual tress occurring in dissimilar butt weld joint b tween P91 and SS304 pl tes and circumfer nt ally welded pip . This covers sequential coupled thermo-metallurgical and mechanical FEM tim -step analysis usi g three-dimensional models. The model predicted residual stresses are compared with residual stresses in weld joints of P91 and SS304. © 2018 The Authors. Published by Elsevier B.V. This is an open access article und r 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: Dissimilar Welding; FEM; P91; SS304.

© 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.: +91-44-27480500. E-mail address: vijaysai@igcar.gov.in * Correspon ing author. Tel.: +91-44-27480500. E-mail address: vijaysai@igcar.gov.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.2019.05.059