PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 722–727 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. ECF22 - Loading and Environmental effects on Structural Integrity Modelling of dynamic crack propagation on concrete matrix aggregate interface Baijian Wu a,b , Keke Tang c, * a Department of Engineering Mechanics, Southeast University, Nanjing 210096, China. b Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096, China c School of Aerosapce Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China This paper is focused on the formulation of a numerical model for dynamic crack propagation on concrete aggregate interface. The concept of energy release rate is incorporated in the algorithm that is conducted in Abaqus through Python script interface. The proposed model is capable of manipulating free propagation of interface cracks. Thus, the on-surface growth of the interface crack, as well as the crack penetration into the concrete matrix, are successfully implemented. A case in point is the rupture behavior of concrete matrix containing one-single aggregate. Simulation of one matrix containing an isolated aggregate was conducted. Influence of the side-edge constraint, the aggregate direction as well as the fracture energy of the interface, was investigated. The results how that, tensile constraint on the side edge, a small r ngle between tensil axis and aggr gate, and highe fracture e rgy could lead to a higher r pture streng h of th interface. Once the int rface starts to grow, it immediat ly and unstably propagates to the two ends of t e aggregate major axis, and further enters the matrix. The three facto influences less on the character of above rupture path. Though the conclusion is prudently stipulated to concrete matrix with single aggregate, the numerical model can be also further modified to study the trans-scale propagations of multiple cracks in concrete materials or components. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 Th Authors. Published by Elsevier B.V. Peer-review und r responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Modelling of dynamic crack propagation on concrete matrix ggregate interface Baijian Wu a,b , Keke Tang c, * a Department of Engineering Mechanics, Southeast University, Nanjing 210096, China. b Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096, China c School of Aerosapce Engineering a d Applied Mechanics, Tongji University, Sha hai 2 0092, China Abstract This paper is focused on the formulation of a numerical model for dynamic crack propagation on concrete aggregate interface. e concept of energy release rate is incorporated in the algorithm that is conducted in Abaqus through Python script i t rf . proposed model is cap ble of manipulating free propagation of interface cracks. Thus, the on-surface growth of the interface crack, as well as the crack penetration into the concrete matrix, are successfully implemented. A case in point is the rupture behavior of concret m trix containing one-single aggr gate. Simulation of one matrix containing an isolated aggregate was conducted. Influenc of the side-edge c straint, the aggregate directi as well as the fracture energy f the interface, s invest gated. The r sults show that, tensile constraint on th side edge, a smaller angle between t nsile axis and ggregate, and higher fracture energy could lead to a higher rupture strength of the interfac . Once the i terface starts to grow, it i mediately and unst bly propagates to the two ends of the aggregate maj r axis, and further enters the matrix. The three factor influences less on the character of above rupture path. Though the conclusion is prud ntly stipulated to concrete matrix with si gle aggregate, the numerical model can be also further modifi d t st dy the trans-scale pro agations of multiple cracks in concret materials or components. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Concrete rupture; dynamic crack propagation; matrix-aggregate interface; fracture energy; interfacial crack; trans-scale propagation; energy release rate © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Concrete rupture; dynamic crack propagation; matrix-aggregate interface; fracture energy; interfacial crack; trans-scale propagation; energy release rate Abstract

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.: +86-21-65982267; fax: +86-21-65983267. E-mail address: kktang@tongji.edu.cn * Corresponding author. Tel.: +86-21-65982267; fax: +86-21-65983267. E-mail ad ress: kktang@tongji.edu.cn

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.2018.12.120