PSI - Issue 14

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 14 (2019) 2 7–214 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. © 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. 2nd International Conference on Structural Integrity and Exhibition 2018 Use of full-field measurements for understanding acoustic emission (AE) sig als from 15CDV6 ESR steel specimens Digendranath Swain a, *, B. Binu a , Yogesh a , K. K. Purushothaman a , G. S. Rao b , Binu P. Thomas a , Thomas Kurian c , P. Ramesh Narayanan b , Jeby Philip a a Experimental Mechanics Division (EXMD), STR Entity, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India b Matrial Characterization Division (MCD), MME Entity, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India c Hardware Design and Realization Division (HDRD) PRSO Entity, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India Abstract One of the primary issues with acoustic emission (AE) technique is the lack of correlation of the AE signals with the quantitative mechanical behavior of any material and structure. In this paper, Digital Image Correlation (3D-DIC) is used as a complementary tool to support the AE observation for 15CDV6 ESR (electro slag refined) steel specimens. Towards this goal, standard surface cracked tensile (SCT) and plain tensile (PT) specimens were examined to understand their failure behavior. The surface cracks were generated on welds whereas the PT specimens were without any weld. Two parameters namely the centre crack opening displacement (CCOD) and the strain fields in the vicinity of the crack tips were correlated with the AE parameters to establish various stages of material degradation in SCT specimens. Similarly, in PT specimens AE signals corresponding to initiation of yielding and growth of an internal defect were identified correlating with the strains measured from DIC. The results indicate that integration of AE and DIC could be one of the favorable options for a comprehensive understanding of structural integrity and material degradation. © 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 d peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Use of full-field measurements for understanding acoustic emission (AE) signals from 15CDV6 ESR steel specimens Digendranath Swain a, *, B. Binu a , Yogesh a , K. K. Purushothaman a , G. S. Rao b , Binu P. Thomas a , Thomas Kurian c , P. Ramesh Narayanan b , Jeby Philip a a Experiment l M ch n cs i i i (EXMD), STR tity, b M trial Char cteriz t on Division (MCD), MME Entity, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India c Hardware Design and Realization Division (HDRD), PRSO Entity, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India Abstract One of the prim ry issues with acoustic emission (AE) technique is the lack of cor elation of the AE s gnals with the quantita ive mechanical behavior of any m erial and structure. In this paper, Digital Imag Corr latio (3D-DIC) is u ed s a complement ry tool to support the AE observation for 15CDV6 ESR (elect o sl g refined) ste l pecimens. Towards this goal, standard su face cracked t nsile (SCT) and plain tensile (PT) specimens were examined to understand their failure behavior. Th surface cracks were g nerated on welds w ereas the PT specimens were wi out ny weld. Two parameters nam ly the centre crack open ng displacement (CCOD) and the str in fields in the v cinity of the crack tips were correlated with the AE parameters to es ablish various stages f material deg adation in SCT specimens. Similarly, n PT spec mens AE signals corresponding o initiation of yielding a d growth of an internal d fect were identified correlating with the strains measured from DIC. The results indica e that integration of AE and DIC could be one of the favorable options for a comprehensive understanding of structural integrity and material degradation. © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Structural integrity, AE technique, full-field measurement, DIC, 15CDV6 ESR Steel, surface cracked tensile (SCT) specimen Keywords: Structural integrity, AE technique, full-field measurement, DIC, 15CDV6 ESR Steel, surface cracked tensile (SCT) specimen

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +91-471-256 4913; fax: +91-471-256 4038. E-mail address: digendranath@gmail.com * Correspon ing author. Tel.: +91-471-256 4913; fax: +91-471-256 4038. E-mail address: digendranath@gmail.com

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 a open access article und r the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by- c-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

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.2019.05.027