PSI - Issue 6

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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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Investigation of the correlation between acoustic anisotropy, damage and measures of the stress-strain state Alexander K. Bely ev a,b, ∗ , Vladimir A. Polyanskiy a,b , Artem S. Semenov b , Dmitry A. Tretyakov b , Yuriy A. Yakovlev a,b a Institute for Problems in Mechanical Engineering RAS, 61, Bolshoj pr. V.O., St.Petersburg, 199178, Russia b Peter the Great Saint-Petersburg Polytechnic University, 29, Polytechnicheskaya, St.Petersburg, 195251, Russia Abstract Investigation of the correlation between measure of damage tensor and acoustic anisotropy of specimens from commercial alloy was carried out. The relationship between the principal values of dam ge tensor and the velocities of ultrasonic waves was estab lished. The formula for acoustic anisotropy based on the principal values of damage tensor was proposed. It allows to describe the anisotropy of the accumulation of damages, which have a significant influence on acoustic anisotropy. The nonlinear dependence of acousti anisotropy on local deformations and axial stresses in the region of large plastic deformations was observed. The results of the investigation indicate the possibility of estimating of damage based on measurements of acoustic anisotropy. It has a great impo tance for an objective estimating the state of ngineeri g structures by acoustic methods. c 2017 The Authors. Published by Elsevier B.V. er-review under responsibility of the CM 2017 organizers. Keywor s: acoustic anisotropy, damage tensor, plastic deformation , lo gitudinal and transverse waves, ultras ic i spection The inv stigation of the anisotropy of the a oustoelastic properties of engineering structures in the nuclear, oil and gas and automotive industries is important for the development of acoustic methods of nondestructive testing. The method of acoustoelasticity is a method of nondestructive testing, based on the measurement of acoustic anisotropy. Measuring of the stresses averaged over the thickness of the material is an advantage of the acoustoelasticity method in comparison with tensometry methods. Acoustic anisotropy ∆ a is defined as the relative di ff erence in the velocities of transverse ultrasonic waves v 1 , v 2 of mutually orthogonal polarization: ∆ a = 2( v 1 − v 2 ) / ( v 1 + v 2 ) (1) XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Investigation of the correlation between acoustic anisotropy, damage and easures of the stress-strain state Alexander K. Belyaev a,b, ∗ , Vladimir A. Polyanskiy a,b , Artem S. Semenov b , Dmitry A. Tretyakov b , Yuriy A. Yakovlev a,b a Institute for Problems in Mechanical Engineering RAS, 61, Bolshoj pr. V.O., St.Petersburg, 199178, Russia b Peter the Great Saint-Petersburg Polytechnic University, 29, Polytechnicheskaya, St.Petersburg, 195251, Russia Abstract Investigation of the correlation between measure of damage tensor and acoustic anisotropy of specimens from commercial alloy was carried out. The relationship between the principal values of damage tensor and the velocities of ultrasonic waves was estab lished. The formula for acoustic anisotropy based on the principal values of damage tensor was proposed. It allows to describe the anisotropy of the accumulation of damages, which have a significant influence on acoustic anisotropy. The nonlinear dependence of acoustic anisotropy on local deformations and axial stresses in the region of large plastic deformations was observed. The results of the investigation indicate the possibility of estimating of damage based on measurements of acoustic anisotropy. It has a great importance for an objective estimating the state of engineering structures by acoustic methods. c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: acoustic anisotropy, damage tensor, plastic deformations, longitudinal and transverse waves, ultrasonic inspection 1. Introduction The investigation of the anisotropy of the acoustoelastic properties of engineering structures in the nuclear, oil and gas and automotive industries is important for the development of acoustic methods of nondestructive testing. The method of acoustoelasticity is a method of nondestructive testing, based on the measurement of acoustic anisotropy. Measuring of the stresses averaged over the thickness of the material is an advantage of the acoustoelasticity method in comparison with tensometry methods. Acoustic anisotropy ∆ a is defined as the relative di ff erence in the velocities of transverse ultrasonic waves v 1 , v 2 of mutually orthogonal polarization: ∆ a = 2( v 1 − v 2 ) / ( v 1 + v 2 ) (1) © 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. 1. Introduction

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. ∗ Corresponding author. Tel.: + 7-812-321-47-78; fax: + 7-812-321-47-78. E-mail address: vice.ipme@gmail.com 2210-7843 c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. ∗ Corresponding author. Tel.: + 7-812-321-47-78; fax: + 7-812-321-47-78. E-mail address: vice.ipme@gmail.com 2210-7843 c 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.031