PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 353–36 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Failure analysis of gas sweetening tower absorber packing M. Newishy, S. A. Khodir, H. Abdel-Aleem Central metallurgical research and development institute,EGYPT Abstract Gas sweetening tower packing was failed in the form of corrosion damage after 3 months from installation. Pieces from the failed packing as well as unused one were received for investigation to establish whether its failure was due to specific material aspects or improper use. The investigation showed that the packing was 316L stainless steel which failed due to intergranular chloride stress corrosion cracking. The root cause of the failure of the received packing could be mainly attributed to the material residual shear bands aft r packing sheet manufacturing process. The shea bands were forme due to l ck of s lution nnealing after cold deformation process. Corrosion is mainly controlled by chloride ions and residual stress. It is recommended to use high quality material free from residual stresses by applying solution annealing heat treatment after cold deformation of the packing sheets and removing of the chloride ions by controlling the inlet water. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Gas sweetining, asorber packing, corrosion, stress corrosion cracking, failure analysis 1. Background Sweetening gas unit absorber packing has been failed after 3 months f om the replac m nt. The expect d life time should be 6-8 years. The remaining failed packing samples as well as new packing samples were received for failure analysis. The sweetening gas unit absorber packing had been manufactured to confirm to Stainless steel AISI 316L. The packing had been constructed to serve horizontally on the sweetening tower with operating pressure is 85 bar and 80 o C. The packing layers are in contact with Benfield solution (28% wt of K 2 CO 3 , 2%wt V 2 O 5 and 70%wt water), natural gas with the CO 2 analysis at inlet and outlet of the absorber tower shown in table 1. Table1. Gas analysis at inlet and outlet of the absorber tower inlet outlet inlet outlet Components Mol. % Mol. % Wt. % Wt. % Carbon Dioxide 8.039 3.322 16.447 7.147 ECF22 - Loading and Environmental effects on Structural Integrity Failure analysis of gas sweetening tower absorber packing M. Newishy, S. A. Khodir, H. Abdel-Aleem Central metallurgical research and development institute,EGYPT Abstract Gas sweetening tower packing was failed in the form f corrosion damage after 3 months from installation. Pieces from the failed packing as well as unused o e ere received for investigation t establish wh ther its failure was due to specific material aspects or improper use. The investigation showed that the packing was 316L stainl ss steel which faile due to intergranular chloride stress corrosion cracking. The ro t cause of t e failure of the received packi g could be mainly attrib ted to the material residual h ar bands after packing sheet manufacturing process. The sh ar bands were formed due to lack of solution annealing aft r cold defo m tion process. Corrosion is mainly controlled by chloride ions and residual stress. It is recommended to use high quality material free fr m residual stresses by applyi g solution annealing heat treatment fter cold deformation of the packing s eets and removing of the chlori e ions by controlling the inlet water. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Gas sweetining, asorber packing, corrosion, stress corrosion cracking, failure analysis 1. Backgr und Sweetening ga unit absorber packing has been failed after 3 mont s from the replaceme t. The expecte life time should be 6-8 years. The remaining failed packing samples as well as new packing samples were received for failure analysis. The sweetening gas unit absorber packing had been manufactured to confirm to Stainless steel AISI 316L. The packing had been constructed to serve horizontally on the sweetening tower with operating pressure is 85 bar and 80 o C. The packing layers are in contact with Benfield solution (28% wt of K 2 CO 3 , 2%wt V 2 O 5 and 70%wt water), natural gas with the CO 2 analysis at inlet and outlet of the absorber tower shown in table 1. Table1. Gas analysis at inlet and outlet of the absorber tower inlet outlet inlet outlet Components Mol. % Mol. % Wt. % Wt. % Carbon Dioxide 8.039 3.322 16.447 7.147 © 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 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.059