PSI - Issue 10

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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. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials First order reliability method on soil strength parameters estimation and stability analysis G. Belokas* University of West Attica, Agioy Spyridonos 28, Aigaleo 12243, Greece Abstract The application of the first order reliability method (FORM) on the estimation of soil strength parameters and on the probabil istic analysis of slope stability problems is examined. Typical slope stability problems use the bi-parametric Mohr - Coulomb failure criterion and modern codes of practice (e.g. EC7) require some statistical measures for analyses purposes, either deterministic or probabilistic. Statistical approaches for the estimation of the measures of (a) the best estimate and uncertainty of these parameters (used in probabilistic analyses) and (b) their characteristic value (used in deterministic analyses) are presented herein. The uncer tainty is estimated either by direct statistical methods or by application of the FORM, a methodology for uncertainty (via error propagation) calculation. Equations of uncertainty are derived for the direct shear- and the typical triaxial-test. An application of the FORM to t e planar f ilure limit quilibrium problem is presented, which can b adjusted to the slices’ method. The eliability check with r spect o t e safety margin is preferable s it reduces the n -linearity ffects, while the influenc of cohesion uncertai ty is more critical. A sensitivity check with regards to the uncertainties of soil parameter is recommended for probabilistic analyses. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Keywords: Reliability; FORM; probabilistic; strength parameters; Mohr Coulomb; characteristic; Eurocode 7 1. Introduction Modern codes of practice for the analysis and the design of geotechnical works (e.g. Eurocode 7 – EC7), give the alternative of performing probabilistic (non-deterministic) analyses by application of reliability theory principles. FORM 1 st t ti l t i t i t l i t i l and stability analysis . l iversity f est ttic , i y yri s , i le , reece st t li ti f t first r r r li ilit t ( ) t sti ti of soil stre t r t rs t r il isti l sis f sl st ilit r l s is i . i l sl st ilit r l s s t i- r tri r - l f il r rit ri r s f r ti ( . . ) r ir s st tisti l s r s f r l s s r s s, it r t r i isti r r ilisti . t tisti l r s f r t sti ti f t s r s f ( ) t st sti t rt i t f t s r t rs ( s i r ilisti l s s) ( ) t ir r t risti l ( s i t r i isti l s s) r r s t r i . r t i t is sti t it r ir t st tisti l t s r li ti f t , t l f r rt i t ( i rr r r ti ) l l ti . ti s f rt i t r ri f r t ir t s r- t t i l tri i l-t st. li ti f t t t l r fail r li it e ili ri r l is r s t , i j st t t sli s’ t . r li ilit it res t t t s f t r i is r f r l s it r s t -li rit eff ts, il t i fl e f si rt int is r riti l. s siti it it r r s t t rt i ti s f s il r t r is r f r r ilisti l s s. t rs. lis ls i r t . This is ss rticle under the CC BY-NC-ND li s ( ttp://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials ey rds: Reliability; FORM; probabilistic; strength parameters; Mohr Coulomb; characteristic; Eurocode 7 1. Introduction r f r ti f r t l i t i f t i l r ( . . r ), i t lt r ti f rf r i r ili ti ( - t r i i ti ) l li ti f r li ilit t r ri i l . © 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.: +30 210 5385385; fax: +30 210 5385316. E-mail address: gbelokas@teiath.gr Received: May 06, 2018; Received in revised form: August 14, 2018; Accepted: August 20, 2018 rres i a t r. el.: ; fa : . - il ress: el as teiat . r eceive : a , ; eceive i revise f r : st , ; cce te : st ,

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 Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.018 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials - t rs. lis ls i r t . is is ss rti l r t - - li s ( tt :// r ti ecomm s. r /li s s/ - - / . /). r-r i r res si ilit f t s i tifi itt f t st I t r ti l f r f t r i t f ri t l i s f t ri ls * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt