PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1521–1526 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 Experimental and numerical investigation of the fracture in steel welded joints A.Prokhorov a *, A.Kostin . a , A.Veder ikova a , O.Plekhov a , M.M naka b , B.Venkatraman b a ICMM UB RAS, Perm, Russia b Indira Gandhi Centre for Atomic Research, Kalpakkam, India The work is devoted to the experimental and numerical investigation of fracture of the laser-welded specimen under quasi-static tension. In present study, two different steels stainless 316LN and P91 were welded with Laser Welding Process. The experimental study was carried out in Indira Gandhi Centre for Atomic Research (India). The evolution of the temperature field during each test was record by infrared camera CEDIP 420. Experimental results have shown quasi-wave character of the temperature evolution accompanying the specimen fracture process. During the experiments authors shown that accumulation of plastic strain irregular between joined materials, plastic flow in the P91 side overtakes plastic flow in the SS316LN side due to the various strain hardening rates of those materials. Numerical simulation of a tensile test was performed in the finite-element package Comsol Multiphysics under plane stress conditions. Simulation was carried out for two cases: small strain condition and large plastic strains, large plastic strains allow illustrate the necking effect of the specimen in the localization zone. The temperature evolution on the surface of a specimen has quantitative correspondences with the experimental results. Results of numerical simulation provided an explanation of the observed phenomena and let us to propose a model of strain localization. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywo ds: fracture, quasistat c tension, Infrare termography, steel welded joints, laser-welding The safety during exploitation of complex metal constructions is provided by high strength and fatigue properties of object’s com ponents and joints between them. The laser-welding technique allows one to joint the materials with different physical and thermo-mechanical properties in contra distinction to the classic arc welding method [1]. This method have a lot of industry and scientific application. High-quality laser-welded joints require a number of parameters (laser power, welding speed and focal position) to be determined [2, 3]. Moreover, the final detail will have properties of both materials and the transition area with some unknown effective characteristics. As a result, we © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Experimental and numerical investigation of the fracture in steel welded joints A.Prokhorov a *, A.Kostina. a , A.Vedernikova a , O.Plekhov a , M.Menaka b , B.Venkatraman b a ICMM UB RAS, Perm, Russia b Indira Gandhi Centre for Atomic Research, Kalpakkam, India Abstract The work is devoted to the experimental and numerical investigation of fracture of the laser-welded specimen under quasi-static tension. In pr sent study, two different steels stain ess 316LN and P91 were welded ith La er W lding Proce s. The experimental study was carried out in I dira Gandhi Centre for A omic Research (India). The evolution of the temperature field during each test was record by infrare c mera CEDIP 420. Experimental results have shown quasi-wave character of the temperature evolution ac mpany g th specimen fracture process. During the xperiments authors shown that accumulation of plastic strain irregular between jo ed materials, plasti flow in the P91 side ov rtakes pla tic fl w in the SS316LN side due to the various strain hardening rates of those m teria s. Numerical simulation of a tensile test was perform d in the finite- lement pack ge Comsol Multiphysics under plan stress conditions. Simulation was carri d out for t o cases: s all strain condition a d large plastic strains, large plastic strai s allow illustrate the necking effect of the specimen in the localization zone. The temperature evolution on the surface of a specimen has quantitative correspondences with th experimental results. Results of numerical simulation provided an explanation of the observed phenomena and let us to propose a model of strain localization. © 2018 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. Keywords: fr cture, quasistatic tension, Infrared termograp y, steel welded joints, laser-welding 1. Introduction The safety during exploitation of complex metal constructions is provided by high strength and fatigue properties of object’s com po ents and joints between them. The laser-welding technique allows one to joint the materials with different physical and thermo-mechanical properties in contra distinction to the classic arc welding method [1]. This method have a lot of industry and s ientific applicati . High-quality laser-welded joints require a number of parameters (laser power, welding speed and focal positi ) to be determined [2, 3]. Moreover, the fin l detail will h ve properties of both mat rials and the transition area with some unknown effective characteristics. As a r sult, we © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract

* 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 responsibility of the ECF22 organizers.

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.2018.12.311