PSI - Issue 14

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 14 (2019) 3 4–313 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Microstructure and mechanical properties correlation of weld joints of high strength naval grade st el P D Gosavi*, K K Sarkar, S K Khunte, V R Pawar, and B Basu Naval Materials Research Laboratory, Defence Research Development Organisation (DRDO), Ministry of Defence, Additional Ambernath, Anandnagar P.O; Thane-421 506, INDIA Low alloy steels of higher strength grades are conventionally used for pressure hull application. Strength required range from 560 MPa to 800 MPa and plate thickness requirement is often higher (40 mm or more). Welding of high strength steels with higher thicknesses is often a challenge. From the view point of structural integrity challenge is not only to obtain defect free weld joint but also to meet the strength and low temperature toughness requirement in both weld and HAZ. In hull construction, different types of welding processes ar used depending up n the requirement, accessibility and criticality of the weld joints to be produced. Conventionally, w lding processes include Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), Submerged Arc Welding (SAW) & Gas Tungsten Arc Welding (GTAW). Number of eld consumables in igenously d veloped for a higher strength steel (YS~800 MPa), were used to develop the procedure, for producing weld joints, meeting the critical structural property requirements. Present study was focused on structural property correlation of weld joints made using these indigenous consumables. Weld joints were characterized in terms of impact toughness, Ductile Brittle Transition Temperature (DBTT), tensile properties and quantitative metallography. DBTT of weld joint is important from the aspect of structural integrity at sub-zero temperature. Impact toughness at -40 ° C varied from 39 J for SMAW process to 191 J for GTAW process. Yield strength of weld joints varied from 534 MPa for SMAW process to 907 MPa for GTAW process. Quantitative metallography was carried out to determine volume fraction of acicular ferrite (AF) in different welds. Heat input (HI) to produce a weld joint varied with welding processes used. HI for SMAW was 1.3 kJ/mm while it was 2.2 kJ/mm for SAW process. At HI of 1.85 kJ/mm (GTAW), a higher % fraction of AF (~77%) having Impact toughness of 191 kJ/mm at -40° C. 2nd International Conference on Structural Integrity and Exhibition 2018 Microstructure and mechanical properties correlation of weld joints of a hig strength naval grade steel P D Gosavi*, K K Sarkar, S K Khunte, V R Pawar, and B Basu Naval Materials Research Laboratory, Defence Research Development Organisation (DRDO), Ministry of Defence, Additional Ambernath, Anandnagar P.O; Thane-421 506, INDIA Abstract Low alloy steels of higher strength grades are conventionally used for pressure hull application. Strength required range from 560 MPa to 800 MPa and plate thickness requirement is often higher (40 mm or more). Welding of high strength steels with higher thicknesse is often a c allenge. From the view poi t f structural integrity challenge is not only to obtain def ct free weld joint but ls to meet the strength and low t mp rature tough ess requirement in both weld and HAZ. In hull construction, different ypes of welding pro esses are used d pending upon the requirem nt, a cessibility a d criticality of th weld joints to be produced. Conventionally, welding process s include S ielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), Submer ed A c W lding (SAW) & Gas Tu gste Arc Weldi g (GTAW). Number of w ld consumables digenously devel ped for a higher stre gt st el (YS~800 MPa), were s d to develop he p ocedur , for producin weld joints, m eting the critical structu al property requirements. P e nt s udy was focused on structu al property correla ion of weld joints made using these i digenous consumables. Weld joints ere charact rized in ter s of impact toughness, Ductile Brittle Transition Temperature (DBTT), tensile properties and quantitative metallogr phy. DBTT of weld joint is important fr m the aspect of structural integrity at sub-zero temper ture Impact toughn ss at -40 ° C varied fro 39 J for SMAW process to 191 J for GTAW process. Yield strength of weld joints vari d from 534 MPa for SMAW process to 907 MPa for GTAW process. Quantitative metallography was carried out to det rmine volume fraction of acicular fe rite (AF) in di ferent welds. H at input (HI) to produce a weld jo nt varied with w lding processes used. HI for SMAW was 1.3 kJ/mm while it was 2.2 kJ/mm for SAW process. At HI f 1.85 kJ/mm (GTAW), a higher % fraction of AF (~77%) having Impact toughness of 191 kJ/mm at -40° C. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-revi w u der responsibility of the SICE 2018 organizers. Keywords: HSLA Steel; Mechanical properties; DBTT; Acicular Ferrite; Heat input Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract

Keywords: HSLA Steel; Mechanical properties; DBTT; Acicular Ferrite; Heat input

* Tel.: +0251-2623023 Email Address: prathmesh1729@gmail.com * Tel.: +0251-2623023 Email Address: prathmesh1729@gmail.com

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.038 2452-3216© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt