PSI - Issue 2_A

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 1497–15 5 Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Failure analysis of screw propellers and increase of fail safety by surface modification with multicomponent materials with shape memory effect Blednova Zh.M. a *,Rusinov P.O. a , Dmitrenko D.V. a a Kuban State Technological University, Moskovskaya 2, Krasnodar 350072, Russia Abstract Based on the failures analysis of screw propellers we defined quantitative characteristics of the damage. It is shown that most failures are related to the cracks formation and corrosion-erosion lesions. To increase fail safety and prolong product life cycle,we suggested forming a composite surface layer by means of multicomponent materials with shape memory effect (SME) by high-velocity oxy-fuel spraying in a single technological cycle. We supplied the results of stress-strain state (SSS) numerical studies of a screw propeller with nanostructured composite surface layer. Experimental studies of surface-modified samples for fatig e strength, wear resistance, corrosion resistance in seawater confirmed increase in performance characteristics . © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: screw propeller; failures; reliability; stress-strain state (SSS); surface modification, shape memory effect (SME) 1. Introduction The most important and expensive element of propulsion/steering unit in modern vessels still remains a screw propeller (SP), w ich operates under conditions of significant fluctuating loads. Although the SP design has changed in recent y ars, n w materia s have appeared and quality requirements have increased, the task to ensure reliability and fail safety of SP still remains relevant. Damage of SP during the vessel operation brings to considerable financial costs due to the vessel dockage, screw replacement, vessel idleness. Therefore it is possible to take a reasonable decision on a particular failure only on the basis of analysis of types, causes and consequences of SP failure. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Failure analysis of screw propellers and increase of fail safety by surface modification with multicomponent materials with shape mem ry effect Blednova Zh.M. a *,Rusinov P.O. a , Dmitrenko D.V. a a Kuban State Technological University, Moskovskaya 2, Krasnodar 350072, Russia Abstract Based on the failures analysis of screw propellers we defined quantitative characteristics of the damage. It is shown that most failures are related to the cracks formati n and corrosio -erosio lesions. To increase fail safety and prolong product life cycle,we suggest forming a comp site surface layer by means of multicompone t m terials with shape mem ry effect (SME) b high-velocity oxy-fuel spraying in a single t chnological cycle. We supplied the results of stress-strain state (SSS) numerical studie of a screw prop ller with na ostructured composite surface layer. Experimental studies of surf ce-modified sampl s for fatigue strength, ear resistance, corr sion resistance in eawater onfirmed increas in performance ch racteristics . © 2016 The Authors. Published by Elsevier B.V. Peer-r view under res onsibility of the Scientific Committee of ECF21. Keywords: screw propelle ; failures; reliability; stress-strain state (SSS); surface modification, shape memory effect (SME) 1. Introduction The most important and expensive element of propulsion/steering unit in modern vessels still remains a screw propeller (SP), which operat s under conditio s significant fluctuating loads. Although th SP design ha changed in recent years, new mat ial hav app ared and qual ty requirements have increased, the task to ensure reli bility a d fail safety of SP still rem ins rel vant. Damage of SP during t e vessel opera ion brings to considerable fi ancial cos s due to the v ssel dockage, screw replacement, vessel idlen ss. Therefore it s possible to take a reasonable decision n a particu ar failur only on the basis of analysis of types, causes and consequences of SP failure. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +7-918-023-79-51; fax: +7-861-253-4997 . E-mail address: blednova@mail.ru 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +7-918-023-79-51; fax: +7-861-253-4997 . E-mail address: blednova@mail.ru

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.190