PSI - Issue 6

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 6 (2017) 95–10 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 The Auth rs. Publis ed by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Impact resistance of prestressed and reinforced concrete slabs under falling weight indenter Vimal Kumar a , M. A. Iqbal a,* , A. K. Mittal b a Department of Civil Engineering, Indian Institute of Technology, Roorkee-247667, India b Structural Engineering Group, CSIR-Central Building Research Institute, Roorkee-247667, India Abstract Impact resistance behavior of prestressed and reinforced concrete slabs has been investigated under a freely falling steel impactor. The target concrete slabs having equivalent span of 800 mm × 800 mm and thickness 100 mm. The prestressed and reinforced concrete slabs were having same design compressive strength, 72 N/mm 2 . All the four edges of the slabs were clamped in the drop impact setup. The slabs were impacted at the center of span by dropping a steel mass of 243 kg from a fixed height of 500 and 1000 mm. The impact force, reaction, acceleration and deflection response for both prestressed and reinforced concrete slabs were studied. The experimental results showed that prestressed concrete slab has better performance compared with identical reinforced concrete slab. The load carrying cap city of slab has increas d by 4.5% and deflection h reduced by 28% due to the employed prestr ss in the concrete. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: Prestressing; Slab; High-Strength Concrete; Drop Impact Loading; Impact Resistance; 1. Introduction The magnitu e of strain rate influenc s the failure m chanism and characteristics of brittle concrete like material. The extent of localized deformation with increase in the loading rate has led to the initiation of punching and shear cracks in the vicinity of the impact locatio . Studi s w re carried out by Mastali et al. (2017), Ulzurrun and Zanuy XXVII International Conference “Mathematic l and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Impact resistance of prestressed and reinforced concrete slabs under falling weight indenter Vimal Kumar a , M. A. Iqbal a,* , A. K. Mittal b a Dep rtment of Civil Engineering, Indian Institute of T chnology, Roorkee-247667, India b Structural Engineering Group, CSIR-Central Building Research Institute, Roorkee-247667, India Abstract Impact r sista beh vior of prestressed and rei f rced concrete slabs has been inv tigated under a freely falling steel impactor. The target concr t slabs having equivalent span of 800 mm × 800 m and ickness 100 mm. The prestressed an reinforced concrete slabs were having same design compressive stre gth, 72 N/mm 2 . All the four edges o the slabs wer clamped in the drop i pact s tup. The slabs w re impacted at the center of span by dro ping a steel mass of 243 kg from a fixed height of 500 nd 1000 mm. The impact force, reaction, acceleration and deflecti sponse for both restressed and reinforced concrete slabs were studied. The xperimental results showed that prestressed concrete slab has better perform nc compared with identical r inforc conc te slab. The load carrying capacity of slab has in rease by 4.5% and deflection has reduce by 28% due t the mployed prestress in the concrete. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: Prestressing; Slab; High-Strength Concrete; Drop Impact Loading; Impact Resistance; 1. Introduction The magnitude of strain rate influences the failure m ch n sm nd characteristics of brittle concrete like material. The exten of localized deformation with i crease i th l ading rate has ed to th initiation of punchi g and shear cracks in the vicinity of the impact location. Studies were carried out by Mastali et al. (2017), Ulzurrun and Zanuy © 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 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. * Corresponding author. Tel.: +91-1332-285866; fax: +91-1332-275668. E-mail address : iqbal_ashraf@rediffmail.com, panchariya.vimal@gmail.com * Corresponding author. Tel.: +91-1332-285866; fax: +91-1332-275668. E-mail address : iqbal_ashraf@rediffmail.com, panchariya.vimal@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 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.015