PSI - Issue 6

www.elsevier.com/locate/procedia

Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 6 (2017) 11–18 XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Energy absorption capacity of prestressed and reinforced concrete www.elsevier.com/locate/procedia XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) Energy absorption capacity of prestressed and reinforced concrete 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. Copyright © 2017 The Authors. Published y Els vier B.V. Peer-review under responsibility of he MCM 2017 organizers. 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 The dynamic response of prestressed and reinforced concrete slabs has been investigated under a freely falling steel hammer. The prestressed and reinforced concrete slabs has equivalent span of 0.8 m × 0.8 m and thickness 100 mm. The target concrete slabs were prepared using concrete of same design mix having unconfined compressive strength, 48 N/mm 2 . All the four edges of the target slabs were clamped using steel fixtures. All slabs were then hit at the center of the span by fre ly droppi g a steel mass of 243 kg under gravity from a he ght of 500 mm. The residual load carrying capacity and energy absorption capacity of the damaged concrete slabs were further explored by repeatedly dropping the steel mass from the same height. The impact force and deflection response for both prestressed and reinforced concrete slabs were measured under each repeated impact and the energy absorption capacity was compared. Prestressed concrete slab has shown superior performance and subjected to relatively smaller displacement under multiple impacts. The energy absorption capacity of prestressed concrete slab has found to be higher than that of identical reinforced concrete slab. © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the MCM 2017 organizers. slabs subjected to multiple impacts 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 The dynamic response of prestressed and reinforced concrete slabs has been investigated under a freely falling steel hammer. The prestressed and reinforced concrete slabs has equivalent span of 0.8 m × 0.8 m and thickness 100 mm. The target concrete slabs were prepared using concrete of same design mix having unconfined compressive strength, 48 N/mm 2 . All the four edges of the target slabs were clamped using steel fixtures. All slabs were then hit at the center of the span by freely dropping a steel mass of 243 kg under gravity from a height of 500 mm. The residual load carryi capacity and energy absorption capacity of the damaged concrete slabs were further explored by repeatedly dropping the steel ma from th same height. The impact force and deflecti n response for both prestressed and reinforced concrete slabs were measured under each repeated impact and the energy absorption capacity was compared. Prestressed concrete slab has shown superior performance and subjected to relatively smaller displacement under multiple impacts. The energy absorption capacity of prestressed concrete slab has found to be higher than that of identical reinforced concrete slab. slabs subjected to multiple impacts Vimal Kumar a , M. A. Iqbal a,* , A. K. Mittal b

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.: +91-1332-285866; fax: +91-1332-275668. E-mail address : iqbal_ashraf@rediffmail.com, panchariya.vimal@gmail.com © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

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.2017.11.003