PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1082–1 87 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Structural integrity of butt welded connection after fire exposure Dorin Radu a, *, Teofil G ălățanu a , Simon Sedmak b a Transilvania University of Bra șov, Turnului street no.5, 500152 Brașov, Romania b University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Republic of Serbia Abstract The paper presents a study for fire behavior of the butt-welded joints subjected to low cycle fatigue loading, taken into account the post fire conditions and the possibility of welding strengthening. The need of in service life of a steel structure after being exposed to fire raises the problem of strengthening or replacement of some structural elements. There is presented a case study – a building structural element subjected to dynamic loading after fire exposure [1]. For the in case study, post fire investigations revealed several welding flaws including crack type flaws. An assessment was needed in order to determine the structural integrity and life assessment of some structural elements. From the fracture mechanics point of view, a Failure Assessment Diagrams level 2 – FAD 2 procedure was applied in order to determine the in service safety of the structure. Several flaws types were assessed and conclusions were taken. The results can be used for damage assessment and strengthening technique of post fire steel structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction Under fire exposure, steel structures are easy to lose strength but p st fire assessment reports indicate that in most cases fire exposed steel structures retain much of their load bearing capacity after cooling [2]. Therefore, in many cases, after structural safety assessment fire exposed, steel structures can be reused. Establishing the post-fire residual capacity of steel structures has a major importance in overall assessment process. When having a dynamic low cycling fatigue loaded steel structure, the procedure for assessment of the capacity of the structure, must include also the fracture mechanic approach. Numerous studies on the behavior of fire exposed ECF22 - Loading and Environmental effects on Structural Integrity Structural integrity of butt welded connection after fire exposure Dorin Radu a, *, Teofil G ălățanu a , Simon Sedmak b a Transilvania University of Bra șov, Turnului street no.5, 500152 Brașov, Romania b University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Republic of Serbia Abstract The paper presents a study for fire behavior of the butt-welded joints subjected to low cycle fatigue loading, taken into account the post fire conditions nd the possibility of welding strength ning. The need of in service life of a steel structure aft r being exposed to fire raises the problem of strengthening or replacement of some structural elements. Th re is pr sented a case study – a building structural element subjected to dynamic l ading fter fire exp sure [1]. For the in case study, post fir investig tions revealed several welding flaws including crack type fl ws. An assessment was n eded in order to determine the structural integrity and lif asse sment of some structural elements. From the fracture mechanics poi t of view, a Failure Assessment Diagrams level 2 – FAD 2 procedure was applied in order to determine the in service safety of the structure. Several flaws types were assessed and conclusions were taken. The results can be used for damage assessment and strengthening techniqu of post fire steel structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Type your keywords here, separated by semicolons ; 1. Introduction Under fir exposure, steel structures are asy to lose trength but post fire assessment reports indicate that in most cases fire exposed steel structures retain much of their load bearing capacity after cooling [2]. Therefore, in any cases, after structural safety assessment fire exposed, steel structures can be reused. Establishing the post-fire residual capacity of steel structures has a major importance in overall assessment process. When having a dynamic low cycling fatigue loaded steel structure, the procedure for assessment of the capacity of the structure, must include also the fracture mechanic approach. Numerous studies on the behavior of fire exposed © 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.: +40 268 548 228. E-mail address: dorin.radu@unitbv.ro * Corresponding author. Tel.: +40 268 548 228. E-mail ad ress: dorin radu@unitbv.ro

* 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 o ganizers.

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.2018.12.227