PSI - Issue 2_B

ScienceDirect Available online at www.sciencedirect.com Av ilable online at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 2 (2016) 2512–2518 Sci nceDirect Structural Integrity Procedia 00 (2016) 000–000 ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com

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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 Num rical modeling of stress-strain behavior of composite overwrapped pressure vessel Egor Moskvichev* SDTB “Nauka” ICT SB RAS, P.O. box 25515, Krasnoyarsk, 660049, Russia Presented is a numerical modeling analysis of the stress-strain behavior of composite overwrapped pressure vessel with a metal liner loaded by internal pressure. The proposed model is based on finite element method and considers elasto-plastic behavior of the liner, the fiber orientation angle in composite material and contact between liner and composite shell. The model allowed solving problems of determination of stress-strain state, degradation of composite material and fracture assessment of crack-like defect in the liner. The results revealed the effect of propagation of initial defects in composite shell and the critical size of surface crack. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: composite pressure vessel; numerical modeling; stress-strain state; damage propagation; crack; J -integral 1. Introduction Composite ov rwrapp d pressu vessels (COPV) off r a great potential for using in advanced structures such as spacecraft and communications satellites by providing the highest weight efficiency and durability. Considering the high design requirements for these structures the problems of strength and reliability of composite pressure vessels are of the highest priority. It requires development of advanced approaches for strength analysis using the contemporary methods of numerical modeling. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Numerical modeling of stress-strain behavior of composite overwrapped pressure vessel Egor Moskvichev* SDTB “Nauka” ICT SB RAS, P.O. box 25515, Krasnoyarsk, 660049, Russia Abstract Presented is a numerical modeling analysis of the stress-strain behavior of composite overwrapped pressure vessel with a metal lin r loa ed by internal pressure. The proposed model i based on fin te element me hod and consi ers elasto-plastic be avior of the liner, the fiber orientation angle in composite material and cont ct b tw en liner and composite shell. The mod l ll wed solvi g problems of d termination of stress-stra n state, degra ati of composite material and fracture assessm nt f cr ck-like defect in the liner. The esults revealed the effect of propagation of initial def cts in composite sh ll and th critical size of surface crack. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: composite pressure vessel; numerical modeling; stress-strain state; da age propagation; crack; J -integral 1. Introduction Composite overwrapped pr ssure vessels (COPV) ffer a great potential for using in advanced structures such as spacecraft and communicati ns at ll tes by providing the h h s weight ef iciency a d urability. Considering the high design require e ts for these structures the problems of strength and reliability of composite pres ur vessels are of the highest priority. It r quires development of advanced approaches for strength analysi using the contemporary m thods f numerical modeling. 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. Abstract

* 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. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +7-908-211-0889; fax: +7-391-212-4288. E-mail address: jugr@icm.krasn.ru * Corresponding author. Tel.: +7-908-211-0889; fax: +7-391-212-4288. E-mail address: jugr@icm.krasn.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.2016.06.314