PSI - Issue 14

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 Structu al Integrity 14 (2019) 577–583 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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Assessment of Delayed Hydride Cracking at volumetric flaws formed due to bearing pad fretting Ramesh Kumar*, Ritu J. Singh, J. Mishra, V. Balasubramaniyan Atomic Energy Regulatory Board, Mumbai-400094, India Abstract Pressurized Heavy water reactor is a horizontal channel type reactor where fuel bundles are inside pressure tubes (PT) and supported at bearing pad locations. Bearing pad (BP) fretting results in formation of volumetric flaws at PT inner surface which may lead to delayed hydride cracking (DHC). In this paper, safety assessment of pressure tube was carried out against DHC initiation at volumetric flaws using CSA N285.8 procedures. Bounding envelop was developed for threshold bulk Heq and volumetric flaw depth for DHC initiation. Several flaw root radius (r) were assumed to arrive at bounding flaw sizes and threshold bulk Heq in the PT. Peak stress was calculated considering hydride ratcheting condition at flaw tip considering sustained hot condition. Four locations, rolled joint inlet/ outlet and PT main body inlet/outlet were selected to assess DHC initiation for volumetric flaws. Residual tensile str ss was considered fo the assessment at rolled joint location © 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. Keywords: Delayed Hydride Cracking; Pressure Tube; Bounding Flaw; Hydride Ratcheting; Peak Stress; Volumetric Flaw 2nd International Conference on Structural Integrity and Exhibition 2018 Assessment of Delayed Hydride Cracking at volumetric flaws formed due to bearing pad fretting Ramesh Kumar*, Ritu J. Singh, J. Mishra, V. Balasubramaniyan Atomic Energy Regulatory Board, Mumbai-400094, India Abstract Pressurized Heavy water reactor is horizontal channel type reactor where fue bundles are inside pressure tubes (PT) and supported at bearing pad lo ations. Bearing pad (BP) fretting results in formation of vol me ric flaw at PT inner surface which may lead to de ayed hydride cracking (DHC). In this pap r, safety assessment of pressure tube was carrie o t against DHC initiation at volumet ic flaws using C A N285.8 p cedures. Bounding envelop was d veloped for threshold bulk Heq and volumetric flaw depth for DHC initiation. Sev ral flaw root radius (r) were assumed to arrive at bounding flaw s zes and threshold bulk Heq in the PT. Peak stress was calculated consi ering hydride ratcheting condition at flaw tip considering sustained hot condi ion. Four locations, rolled joint nlet/ outlet and PT m in body inlet/ utlet were selected to ass ss DHC initi tion for volumetri flaws. Residual tensil stress was considered for the asses ment at rolled joint loca ion © 2018 The Authors. Published by Elsevier B.V. This is a open access article under the CC BY-NC-ND lic nse (https://creat vecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Delayed Hydride Cracking; Pressure Tube; Bounding Flaw; Hydride Ratcheting; Peak Stress; Volumetric Flaw © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Pressur tube of the PHWR needs to perform reliably throughout its design life. However, the harsh operating conditions like neutron flux, high primary heat transport pressure and temperature poses major challenges to its safe Pressure tube of the PHWR needs to perform reliably throughout its d sign life. However, the harsh perating conditi n like neutron flux, high primary heat transport pressure and te perature poses major challenges to its safe Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction 1. Introduction

* Corresponding author. Tel.: +91-22-2599-0460. E-mail address: kramesh@aerb.gov.in * Correspon ing author. Tel.: +91-22-2599-0460. E-mail address: kramesh@aerb.gov.in

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.2019.05.071