PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1615–1619 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Assessment of the contribution of internal pressure to the structural damage in a hydrogen-charged Type 316L austenitic stainless steel during slow strain rate tensile test Jean-gabriel Sezgin a *, Os mu T kakuwa b , Hisao Matsunaga b,c,d , Junichiro Yamabe e a National Institute of Advanced Industrial Science and Technology (AIST), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395 Japan b Department of Mechanical Engineering, Kyushu University, 744 Moto-ok , Nishi-ku, Fukuoka 819-0395, Japan c Research Center for Hydrogen Industrial Use and Storage, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395 Japan d International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan e Departement of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan Abstract The aim of this study is to provide a quantification of the internal pressure contribution to the SSRT properties of H-charged Type 316L steel tested in air at room temperature. Considering pre-existing penny-shaped voids, the transient pressure build-up has been simulated as well as its impact on the void growth by preforming J Ic calculations. Several void distributions (size and spacing) have been considered. Simulations have concluded that there was no impact of the int rnal pressure on the void growth, reg rdless the void distribution since the eff ctiv pressure was on the order of 1 MPa during the SSRT test. Even if fast hydrogen diffusion related to dislocation pipe-diffusion has be n assesse as a conservativ cas , the impact on void growth was ba ely imperceptible (or signifi antly low). The effect of internal pressure has been experimentally verified via the following conditions: (I) non- harged in va uum; (II) H-charg in vacuum; (III) H-charged in 115-MP nitr gen gas; (IV) non-charged in 115-MPa nitrogen gas. As a result, the r lative reduction in area (RRA) was 0.84 for (II), 0.88 for (III), an 1.01 for (IV), respectively. The difference in void morphology of the H-charg d specimens did not depend on the presence of extern l pressure. These experimental results demonstrate that the intern l pressure had no effect n the tensil ductility and void morphology of the H-ch rged sp cimen. © 2018 The Authors. Published by Els vier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Assessment of the contribution of internal pressure to the structural damage in a hydrogen-charged Type 316L austenitic stainless steel during slow strain rate tensile test Jean-gabriel Sezgin a *, Osamu Takakuwa b , Hisao Matsunaga b,c,d , Junichiro Yamabe e a National Institute of Advanced Industrial Science and Technology (AIST), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395 Japan b Departme t of Mechanical Engineering, Kyushu Univ rsity, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395 Japan c Rese ch Center for Hydroge Industrial Use and Storage, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395 Japan d International Institute fo Carbo -Neutral Energy Rese rch (I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan e Departement of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fuku ka, 814-0180, Japan Abstract The aim of this study is to provide a quantification of the internal pressure contribution to the SSRT properties of H-charged Type 316L steel tested in air at room temperature. Considering pre-existing penny-shaped voids, the transient ressure build-up has be n simula ed as w ll as its impact on the void growth by prefo ming J Ic calculations. Several void distributions ( iz and spacing) have been considered. Simulations have conclu ed that there was no impact of the internal pressure on the void growth, regardless the void distribution since the effective pr ssure w s on the o der of 1 MPa during the SSRT test. Eve if fast hyd gen diffus on related to locat on pip -d ffusion has b en assessed as a conservative case, the impact on v id growth was bar ly mperc ptibl (or significantly low). The effect of internal pr ssure has be n experimentally verified via the follo ing conditions: (I) non-charg d in vacuum; (II) H-charged in vacuum; (III) H-charge in 115-MPa nitrogen gas; (IV) non-charged in 115-MPa nitrogen gas. As a r sult, the relative redu tion in area (RRA) was 0.84 for (II), 0.88 for (III), and 1.01 for (IV), respec ively. The difference in void morphology of th H-cha ged specime s did not depend on the presence of extern l pres ure. Thes experimental results demonstrat at th intern l pressur h d no effect on t nsile ductil ty and void morpho ogy of th H-c arged specim n. © 2018 The Au hors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: void growth, low strain rate tensil test, hydrogen gas, hydrogen embrittlement, hydrogen diffusion, austenitic stainless steel © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywo ds: void growth, slow strain rate tensile test, hydrogen gas, hydr gen embrittlement, hydrogen diffusion, austenitic stainless steel

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. Tel.: +81-942-81-3597; Fax: +81-92-805-5281. E-mail address: sezgin.jean-gabriel@aist.go.jp * Corresponding author. Tel.: +81-942-81-3597; Fax: +81-92-805-5281. E-mail ad ress: sezgin.j an-gabriel@aist.go.jp

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.2018.12.340