PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1117–1122 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity Procedia 00 (2018) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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. © 2018 The Authors. Publi hed by Elsevier B.V. Peer-review under r sponsibility of th ECF22 rganizers. ECF22 - Loading and Environmental effects on Structural Integrity Generalization of mixed mode crack behavior on the base of nonlinear fracture resistance parameters V.N. Shlyannikov, A.P. Zakharov*, A.V. Tumanov, A.M. Tartygasheva Federal Research Center Kazan Scientific Center of Russian Academy of Sciencess, ,Kazan, Russia Abstract Nonlinear crack-tip fracture resistance parameters for two types of cruciform specimens and a compact tension – shear specimen subjected to mixed mode loading are studied by using an elastic – plastic finite element (FE) analysis. FE analysis is performed for two types of steel and titanium and aluminum alloys with different elastic – plastic properties. A Ramberg – Osgood stress – strain relation is used to characterize the elastic-plastic properties of considered materials. Different degrees of mode mixity from pure Mode I to pure Mode II are realized in all considered specimens by combinations of the nominal stresses σ n , remote biaxial stress ratio η , and the initial crack angle α with respect to the loading direction. For the specified geometry of the specimens considered, the governing parameter of the elastic – plastic crack-tip stress field In-factor, the stress triaxiality, J-integral are determined as a function of mode mixity and elastic – plastic material properties, described by strain hardening exponent. As a result influence of the specimen configuration on all considered nonlinear fracture resistance parameters is evaluated. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Elastic-plastic material properties, stress triaxiality, J-integral, mixed mode loading 1. Introduction Generalization of mixed mode crack behavior is actuality problem in a modern fracture mechanics. Shlyannikov and Tumanov (2014) proposed a new analytical method for solving problems for the complete range of mixed mode loadings between Mode I and Mode II and obtained the reference fields for plane mixed-mode problems governing the asymptotic behaviour of the stresses and strains at the crack tip in a power-law elastic – plastic material. Richard (2014) developed a new test specimen configuration and loading devices to obtain pure mode I, pure mode II, pure ECF22 - Loading and Environmental effects on Structural Integrity Generalization of mixed mode crack behavior on the base of nonlinear fracture resistance parameters V.N. Shlyannikov, A.P. Zakharov*, A.V. Tumanov, A.M. Tartygasheva Federal Research Center Kazan Scientific Center of Russian Academy of Sciencess, ,Kazan, Russia Abstract Nonlinear crack-tip fracture resistance parameters for two types of cruciform specimens and a compact tension – shear specimen subject d to mixed mode loading re studied by u ing an elastic – plastic finite element (FE) an lysis. FE analysis i p rformed for two types f ste l and titanium and al m num alloys with different elastic – plastic properties. A Ramberg – Osgood stress – strain relation i used to character ze the el stic-plastic properties o considered materials. Different degrees of mode mixity from pure Mode I to pure Mode II are realized in all considered specimens by combinations of the nominal stresses σ n , remote biaxial stress ratio η , and th initial cr ck angle α with respect to the loading directi n. For the specified geometry of the specimens conside d, the governing parameter of the lastic – pla tic crack-tip stress field In-factor, the stress triaxiality, J-in egral are determine as a function of mode ixity and lastic – plastic material properties, described by strain hardening expone . As a sul influ nce of the specimen configuratio on all considered nonlinear fracture resi tanc parameters is evaluat d. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Elastic-plastic material properties, stress triaxiality, J-integral, mixed mode loading 1. In roduction Generalization of mixed mode crack behavior is actuality problem in a modern fracture mechanics. Shlyannikov and Tumanov (2014) proposed a new analytical method for solving problems for the complete range of mixed mode loadings between Mode I and Mode II and obtained the reference fields for plane mixed-mode problems governing the asymptotic behaviour of the stresses and strains at the crack tip in a power-law elastic – plastic material. Richard (2014) developed a new test specimen configuration and loading devices to obtain pure mode I, pure mode II, pure © 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 © 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 organizers. * Corresponding author. +7-843-236-31-02; fax: +7-843-236-31-02. E-mail address: alex.zakharov88@mail.ru * Corresponding author. +7-843-236-31-02; fax: +7-843-236-31-02. E-mail ad ress: alex.zakharov88@mail.ru

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.2018.12.234