PSI - Issue 13

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 Structural Integrity 13 (2018) 1566–157 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. ECF22 - Loading and Environmental effects on Structural Integrity Refinement of defect detection in the contact and non-contact ultrasonic non-destructive testing of wind turbine blade using guided waves Kumar Anubhav Tiwari a, *, Renaldas Raisutis a a Ultrasound Research Institute, Kaunas University of Technology, K. Barsausko st. 59 - A426, Kaunas LT-51423, Lithuania Abstract The guided waves are widely used for the inspection of many composite structures as they can travel up to long distance along the thickness of the structure. Most of the times, the experimental investigations standalone is not able to locate and size the damages or defects due to dispersive, superimposed and scattered guided wave modes. Hence signal refinement of ultrasonic guided wave signals is required for identifying and characterizing the defects. In this work, disbond type defects presented on different locations of the segment of the wind turbine blade are estimated by applying the signal refinement techniques after experimental analysis. The experiment was carried out on a 1005 x 870 mm segment of wind turbine blade manufactured using a composite glass fiber reinforced plastic material. Two defects on the trailing edge (with diameter 15 and 25 mm) and three defects on the main spar (with diameters 25, 51 and 81 mm) of the WTB segment were investigated. The combination of macro fiber composite transducer, contact type and air-coupled transducers were used to transmit and receive the ultrasonic guided waves. The signal processing techniques are applied to the experimental signals for the estimation and characterization of defects. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywo ds: Guided wav ; composite; signal processing; tra sducer; ultrasound © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Refinement of defect detection in the contact and non-contact ult asonic non-d structiv testing of wind turbine blade using guided waves Kumar Anubhav Tiwari a, *, Renaldas Raisutis a a Ultrasound Research Institute, Kaunas University of Technology, K. Barsausko st. 59 - A426, Kaunas LT-51423, Lithuania Abstract The guided waves are widely used for the inspection of many composite structures as they can travel up to long distance along the thickness of the structure. Most of the imes, the experimental investigations standalone is not able to locate and size the damages or def cts due to dispersive, superimposed and scatt ed guided wave m des. Hence signal refinement of ultrasonic guided wave signals is required for identifying and characterizing th defects. In this w rk, disbond type defects pr sented on different locations of the segment of the wi d turbine blade re estimated by applyi g the signal refi ement techniques after exper m ntal an lysis. The xperiment was carried out on a 1005 x 870 mm segment of wind turbine blad manufactured using a composite gl ss fiber reinforc d plastic material. Two defects on the trailing ed e (with diameter 15 and 25 m ) and h e defects on the main spar (with diameters 25, 51 and 81 mm) of th WTB segment were inv stigated. The combi ation of m cro fib r composite transducer, contact type and air-couple transducers were used to transmit a d receive the ultrasonic guided waves. The signal processing techniques are applied to the xperimental ignals for the estimat on and haracterization of defects. © 2018 The Author . Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: Guided wave; composite; signal processing; transducer; ultrasound © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction Ultrasonic guided wave (UGW) testing in one of leading nondestructive testing (NDT) techniques for the inspection of structures with an aerodynamic shape such as the wing of aircraft or a blade of a wind turbine, which operate under Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Ultrasonic guided wave (UGW) testing in one of leading nondestructive testing (NDT) techniques for the inspection of structures with an aerodynamic shape such as the wing of aircraft or a blade of a wind turbine, which operate under 1. Introduction

* 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. * Corresponding author. Tel.: +370-64694913; fax: +370-37451489. E-mail address: k.tiwari@ktu.lt * Corresponding author. Tel.: +370-64694913; fax: +370-37451489. E-mail ad ress: k.tiwari@ktu.lt

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.2018.12.320