PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 15 8–1513 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 The determining influence of the competition between pore volume change and fluid filtration on the strength of permeable brittle solids Evg ny V. Shilko a,b, *, Andrey V. Dimaki a , Alexey Yu. Smolin a,b , Sergey G. Psakhie a a Institute of Strength Physics and Materials Science SB RAS, 2/4 pr. Akademicheskii, 634055 Tomsk, Russia b Tomsk State University, 36 ave. Lenina, 634050 Tomsk, Russia The paper is devoted to the numerical study of the dependence of uniaxial compressive strength of permeable fluid-saturated brittle solids on the loading rate. We analyzed the influence f strain rate, sample size, permeability of the material, fluid viscosity and a coefficient of the influence of pore pressure on the stress stat of solid skeleton. We have shown that dynamic values of elastic modulus and strength of the sample is a unique nonlinear sigmoid-like function of the dimensionless parameter that characterizes the ratio of applied strain rate to interstitial fluid flow rate. We proposed the unified approximating function, which describes numerically derived dependences with good accuracy. The results of the study are relevant for estimating and forecasting dynamic compressive strength of the samples of different fluid-saturated brittle solids. Moreover, the proposed expression can be applied to determine unknown values of the fluid effect constants on the basis of reducing the experimental data to a unified curve. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: brittle solid; strain rate; permeability; poroelasticity; fluid flow; fracture; strength; nu erical modeling; discrete element method 1. Introduction A wide-spread class of heterogeneous materials includes multiphase materials with high contrast of local mechanical properties. Typical structure of this kind of materials consists of solid phase skeleton and interstitial soft matter components. Well-known examples are permeable rocks, bone tissues, synthesized porous biomedical and various engineering materials (Wegst et al. (2015)). A key feature of the interstitial soft matter is its ability to change © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity The determining influence of the competition between pore volume change and fluid filtration on the strength of permeable brittle solids Evgeny V. Shilko a,b, *, Andrey V. Dimaki a , Alexey Yu. Smolin a,b , Sergey G. Psakhie a a Institute of Strength Physics and Materials Science SB RAS, 2/4 pr. Akademicheskii, 634055 Tomsk, Russia b Tom k State University, 36 ave. Lenina, 634050 To sk, Russia Abstract The paper is devoted to the numerical study of the dependence of uniaxial compressive strength of permeable fluid-saturated brittle solid on th loading r te. We a al zed the influence of strain r te, ample size, permeability of th materi l, fluid viscosity and a coefficient of the influence of pore press re on the stress state of solid skeleton. We have shown that dynam c alue of elastic modulus and strength of the sample is a unique nonlinear sigm id-like functi of the dimensio less parameter that characterizes the ratio of applied strain rate to interstitial fluid flow ate. We proposed the unified approximating function, which des ribes numerically derived depe dences with good accuracy. The results f th study are relevant for estimati g and fore asting dynamic compressive strength of the samples of different fluid- aturated brittle solids. Moreover, the propose expression can be applied to det rmine unknown values of the fluid effect constants on the basis of reducing the experimental data to a unified curve. © 2018 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the ECF22 organizers. Keywords: brittle solid; strain rate; permeability; poroelasticity; fluid flow; fracture; strength; numerical modeling; discrete element method 1. Introduction A wide-spread class of heterogeneous materials includes multiphase materials with high contrast of local mechanical properties. Typical structure of this kind of materials consists of solid phase skeleton and interstitial soft matter components. Well-known examples are permeable rocks, bone tissues, synthesized p rous biomedical and various engineering materials (Wegst et al. (2015)). A key feature of the interstitial soft matter is its a ility to change © 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 © 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 o ganizers. * Corresponding author. Tel.: +7-382-228-6971; fax: +7-382-249-2576. E-mail address: shilko@ispms.tsc.ru * Corresponding author. Tel.: +7-382-228-6971; fax: +7-382-249-2576. E-mail ad ress: shilko@ispms.tsc.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.2018.12.309