PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1417–1424 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Evaluation of slip line theory assumptions for integrity assessnment of defected welds loaded in tension Sameera Naib a, *, Wim De Waele a , Primož Štefane b , Nenad Gubeljak b , Stijn Hertelé a a Soete Laboratory, Dept. of EEMMeCS, Ghent University, Belgium b Faculty of Mechanical Engineering, University of Maribor, Slovenia Abstract To assess the safety and reliability of a structure under working conditions, integrity assessment is a major requirement. In case of welded structures, the presence of imperfections is an impediment for the fitness-for-service. The existence of local strength variations in the weld region and the softening or hardening of heat affected zones gives rise to complexities for the assessment of weld defects, which are not yet fully understood. This paper is concerned with the plasticity analysis defected welded connections loaded under uniaxial tension, using the concept of slip line field theory. In a joint research project between Ghent University and University of Maribor, an attempt is made to understand the development and trajectory of slip lines derived from deformation bands. This paper reports on the results of an experimental program, supported by finite element analysis. Single Edge notched Tension (SE(T)) specimens were extracted from butt-welded steel (S690 QL) plates. Deformation bands were derived using Digital Image Correlation (DIC) and characterized by devoted post-processing. The attained results are a basis for the development of an analytical crack driving force estimation scheme that considers weld heterogeneity. Such scheme is expected to assist in the improvement of standardized defect assessment procedures. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Plasticity, slip lines, DIC, SE(T), weld heterogeneity 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Evaluation of slip line theory assumptions for integrity assessnment of defected welds loaded in tension Sameera Naib a, *, Wim De Waele a , Primož Štefane b , Nenad Gubeljak b , Stijn Hertelé a a Soete Laboratory, Dept. of EEMMeCS, Ghent Unive sity, Belgium b Faculty of Mechanical Engineering, University of Maribor, Slovenia Abstract To assess the safety and reliability of a stru ture under working conditions, integrity as ssm nt is a major requirement. In case of welded structur s, the presence of imperfections is an impediment for the fitness-fo - rvice. Th ex stence of local str gth variations in the weld r gi n and the soft ning or hardening of heat aff cted zones gives rise to complexities for the assessment of wel defects, which ar ot yet fully understood. This ap r is conc rned with the plasticity analysis def cted welded connectio s loaded under uni xial tension, using the concept of slip line field theory. In joint r sea ch project b twe n Ghent University and University of Ma ibor, an attempt i made to und stand the development and trajectory of slip lines derived from eformation ba ds. This paper reports on th results of an experim ntal program, supported by finite element analysis. Singl Edge notched Tension (SE(T)) specimens were extracted from but -welded steel (S690 QL) plates. Deformation band were derived using Digital Im ge Correlation (DIC) and characterized by devoted p st-processing. Th attai d res lts are a basis for the development of an analytical crack driving force stim tion scheme that considers weld heterogeneity. Such scheme is expected to assist in the improvement of standardized defect assessment procedures. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility f the Scientific Committee of ICSI 2017

Keywords: Plasticity, slip lines, DIC, SE(T), weld heterogeneity

© 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. E-mail address: Sameera.NAIB@UGent.be * Correspon ing author. E-mail address: Sameera.NAIB@UGent.be

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.206 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.