PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1817–1827 Available online at www.sciencedirect.com ScienceDirect –”—…–—”ƒŽ –‡‰”‹–› ”‘…‡†‹ƒ ͲͲ ሺʹͲͳͺሻ ͲͲͲ – ͲͲͲ Available online at www.sciencedirect.com ScienceDirect –”—…–—”ƒŽ –‡‰”‹–› ”‘…‡†‹ƒ ͲͲ ሺʹͲͳͺሻ ͲͲͲ – ͲͲͲ

www.elsevier.com/locate/procedia ™™™Ǥ‡Ž•‡˜‹‡”Ǥ…‘ȀŽ‘…ƒ–‡Ȁ’”‘…‡ †‹ƒ ™™™Ǥ‡Ž•‡˜‹‡”Ǥ…‘ȀŽ‘…ƒ–‡Ȁ’”‘…‡ †‹ƒ

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. ʹʹ Ǧ ‘ƒ†‹‰ ƒ† ˜‹”‘‡–ƒŽ ‡ˆˆ‡…–• ‘ –”—…–—”ƒŽ –‡‰”‹–› Development of simplified evaluation method of brittle crack arrest toughness on small-scale bending test in steels Yuki Nishizono a *, Tom ya Kawabata a , Shuji Aiha a a ƒ ”ƒ†—ƒ–‡ …Š‘‘Ž ‘ˆ ‰‹‡‡”‹‰ǡ Š‡ ‹˜‡”•‹–› ‘ˆ ‘›‘ǡ —›‘ǡ ‘›‘ǡ ƒ’ƒ The priority items in the safety evaluation of steel structural components generally include an ability to arrest crack propagation, which is necessary to prevent a catastrophic failure even if a brittle fracture occurs. Th ‘double integrity’ concept of brittle c rack initiati n control and arrest has been considered to be an effective and rational methodology for several decades. The wide plate tensile test such as ESSO test is one of the major methods for evaluating brittle crack arrest toughness of steel plates. Although ESSO test makes it possible to accurately evaluate arrest toughness which indicates the Arrhenius type temperature dependence, it is not suitable for quality assurance test at mass production of steel plates due to its high economical cost and long lead-time. Thus, a number of studies has attempted to establish simplified evaluation method of brittle crack arrest toughness for many years. Generally, bending test is certainly one of the most hopeful methods since it does not require a relatively high test load. However, the phenomenon that brittle crack propagates at extremely high speed in bending condition becomes highly complicated. When brittle crack propagates at almost the same speed as stress wave in bending condition, stress distribution is the middle of the initial state and fully reallocated state by the static equilibrium. It is not easy to make out the detail only by theoretical consideration. In this study, by performing the dynamic elasto-plastic FEA in various test designs based on SEN(B) test, the authors cal ulated the stress distribution at the crack tip and develo ed a new test design suitable for evaluating arrest toughness. Moreover, the authors investigated th correlation between the result of ESSO tests and that of the developed tests and presented its applicab lity. ̹ ʹͲͳͺ Š‡ —–Š‘”•Ǥ —„Ž‹•Š‡† „› Ž•‡˜‹‡” Ǥ Ǥ ‡‡”Ǧ”‡˜‹‡™ —†‡” ”‡•’‘•‹„‹Ž‹–› ‘ˆ –Š‡ ʹʹ ‘”‰ƒ‹œ‡”•Ǥ Keywords: Brittle crack propagation; Dynamic 3D FEA; Dynamic stress intensity factor; Arrest toughness; Tapered press-notched bend test; ȗ —‹ ‹•Š‹œ‘‘Ǥ ‡ŽǤǣ ൅ͺͳǦ͵ǦͷͺͶͳǦ͸ͷͳ͹Ǣ Ǧƒ‹Ž ƒ††”‡••ǣ ‹•Š‹œ‘‘̷ˆ”ƒ…–Ǥ–Ǥ—Ǧ–‘›‘Ǥƒ…ǤŒ’ © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ʹͶͷʹǦ͵ʹͳ͸ ̹ ʹͲͳͺ Š‡ —–Š‘”•Ǥ —„Ž‹•Š‡† „› Ž•‡˜‹‡” Ǥ Ǥ ‡‡”Ǧ”‡˜‹‡™ —†‡” ”‡•’‘•‹„‹Ž‹–› ‘ˆ –Š‡ ʹʹ ‘”‰ƒ‹œ‡”•Ǥ ʹʹ Ǧ ‘ƒ†‹‰ ƒ† ˜‹”‘‡–ƒŽ ‡ˆˆ‡…–• ‘ –”—…–—”ƒŽ –‡‰”‹–› Development of simplified evaluation method of brittle crack arrest toughness on small-scale bending test in steels Yuki Nishizono a *, Tomoya Kawabata a , Shuji Aihara a ƒ ”ƒ†—ƒ–‡ …Š‘‘Ž ‘ˆ ‰‹‡‡”‹‰ǡ Š‡ ‹˜‡”•‹–› ‘ˆ ‘›‘ǡ —›‘ǡ ‘›‘ǡ ƒ’ƒ Abstract The priority items in the safety evaluation of steel structural components generally include an ability to arrest crack propagation, which is necessar to prevent a catastrophic failure even if a brittle fractur occurs. The ‘do ble i tegrit ’ conc pt of brittle c rack i itiation co trol and arrest has been considered to be an effective and rational meth dology for several dec des Th wide plate tensile test uch as ESSO test is one of the major meth ds for valuating brittle crack arrest t ughness of steel plates. Although ESSO test makes it possible to accurately evaluate arrest toughness which indicates the Arrhenius type temperatur dependence, it is not suitable for quality assurance test at mass production of steel plates due to its high conomical cost and long l ad-time. Thus, a umber of studies has ttempted to establish simplified evaluation metho of brittle crack arrest toughness for many years. Generally, bending test is certainly on of the most hopeful methods since it do s not require a relatively high test load. However, th phenomenon that brittl crack propagates at extremely high speed in ben ing c ndition becomes highly complicated. When brittl crack propagates at almost the same speed as stress wave in bending condition, stress distribution is the middle of the initial state and fully reallocated state by t tatic equilibrium. It is not easy to make out the etail only by theoretical consider tion. In this study, by performing th ynamic el sto-plas c FEA in various test designs bas d on SEN(B) st, the authors calculated the stress distribution at the crack tip an develo ed a new test design suitable for evaluating arrest toughness. More ver, the authors investigated the correlation between the result of ESSO tests an hat of the developed tests and presented its applicability. ̹ ʹͲͳͺ Š‡ —–Š‘”•Ǥ —„Ž‹•Š‡† „› Ž•‡˜‹‡” Ǥ Ǥ ‡‡”Ǧ”‡˜‹‡™ —†‡” ”‡•’‘•‹„‹Ž‹–› ‘ˆ –Š‡ ʹʹ ‘”‰ƒ‹œ‡”•Ǥ Keywords: Brittle crack propagation; Dynamic 3D FEA; Dynamic stress intensity factor; Arrest toughness; Tapered press-notched bend test; ȗ —‹ ‹•Š‹œ‘‘Ǥ ‡ŽǤǣ ൅ͺͳǦ͵ǦͷͺͶͳǦ͸ͷͳ͹Ǣ Ǧƒ‹Ž ƒ††”‡••ǣ ‹•Š‹œ‘‘̷ˆ”ƒ…–Ǥ–Ǥ—Ǧ–‘›‘Ǥƒ…ǤŒ’ © 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 ʹͶͷʹǦ͵ʹͳ͸ ̹ ʹͲͳͺ Š‡ —–Š‘”•Ǥ —„Ž‹•Š‡† „› Ž•‡˜‹‡” Ǥ Ǥ ‡‡”Ǧ”‡˜‹‡™ —†‡” ”‡•’‘•‹„‹Ž‹–› ‘ˆ –Š‡ ʹʹ ‘”‰ƒ‹œ‡”•Ǥ Abstract

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.2018.12.334