PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 84 –847 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r lI t rit r i ( )

www.elsevier.com/locate/procedia . l i r. /l t / r i

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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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Estimation of the impact stress gradient in the range of size effect Tomasz Tomaszewski a *, Przemysław Strzel cki a a Institute of Mechanical Engineering, University of Science and Technology, 85-789 Bydgoszcz, Poland This paper analyzes the size effect for bending loads. The reduction in fatigue properties in loads with a stress gradient is lower than in loads with homogenous distribution. The proposed test c nditions for 1.4301 acid-resistant steel in respect of high-cycle fatigu allowed to verify this p e omenon. The test were performed on a minispecimen and a standard pecimen. Vulnerabil ty of the tested material on changing cross-section size of the specimen depending on the type of load (axial, bending) was confirmed experimentally. Analytical calculations of estimating the characteristics other than for the tested cross-section were performed for K HC coefficient and a highly stressed volume model. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: size effect, high-cycle fatigue, stainless steel, minispecimen 1. Introduction The size effect is v ry frequently neglected in analytical calculations. This result from the small probability of obtaining material data for objects with small and large cross-sections. This may generate significant errors in estimating the fatigue properties of materials and structural elements. As is commonly known, strength is reduced in proportion to the increase in size of an object subjected to fatigue loads (Carpinteri and Spagnoli (2009)). This reduction in strength is explained by the influence of factors related with the random distribution of defects in the material, its shape, type of load, and the impact of technological processes during the manufacturing of element. The origin of the size eff ct is relat d with inaccurate scaling f objects. It is not physically possible to re-scale all the features of the object at a fixed level (e.g. changes to its surface, material structure). Such interpretation of the a I tit t f i l i ing, University of Science and Technolog , - z, Poland t T i l t i t i l . ti i ti ti i l it t i t i l t i l it i t i ti . t t iti . i i t t t l i t i l ti ll t i t i . t t i i i t i . l il t t t t t i l i ti i t i i t t l i l, i i i t ll . l ti l l l ti ti ti t t i ti t t t t t ti i i t i l t l l. t . li l i . . Peer-revi i ilit t i ti i itt . : i ff t, i - l f ti , t i l t l, i i i . i i t i tl l t i l ti l l l t . i lt t ll ilit t i i t i l t j t it ll l ti . i t i i i t i ti ti t f ti ti t i l t t l l t . i l , t t i i ti to the increase in size of an object subjected to fatigue loa i t i li . i ti i t t i l i t i l t l t it t i t i ti t i t t i l, it , t l , t i t t l i l i t t i l t. i i t i t i l te it i t li j t . t i t i ll i l t l ll t t t j t t i l l . . t it , t i l t t . i t t ti t © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 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. E-mail address: tomaszewski@utp.edu.pl i t r. - il : t i@utp.edu.pl rr

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.088 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. l i r . . i i ilit t i ti i itt . - t r . li