PSI - Issue 2_A

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2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.259 ∗ Corresponding author. E-mail address: rofigueira.souza@usp.br 2452-3216 c 2016 The Auth rs. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Moreover, o ff shore pipelines are subjected to severe installation conditions to enhance the operational productivity and reduce field development costs. A case of interest is the reel-lay method, in which the welded flowline is coiled around a large diameter reel on a vessel and transported to the deployment location into the sea where the pipe is ∗ Corresponding author. E-mail address: rofigueira.souza@usp.br 2452-3216 c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Structural integrity asse s ent of o ff shore pipelines conducting highly corrosive fluids has beco e a challenging engineering issue du to the increasing oil and gas production in harsh service conditions, such as very deep ater o ff shore reservoirs. Ongoing technology developments support the use of C-Mn steel pipelines with a internal corrosion resistance alloy (CR ) layer, hich is either etallurgically bonded to the outer pipe (clad pipe) or held in place by interference stress (lined pipe). While e ff ective against corrosion, they require the use of CR filler to produce field girth elds thereby introducing additional co plexity in fracture assessments and specifications of critical crack sizes due to the dissimilar mechanical properties of the materials. oreover, o ff shore pipelines are subjected to severe installation conditions to enhance the operational productivity and reduce field development costs. A case of interest is the reel-lay method, in which the welded flowline is coiled around a large diameter reel on a vessel and transported to the deployment location into the sea where the pipe is ∗ Corresponding author. E-mail address: rofigueira.souza@usp.br 2452-3216 c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy CTOD estimation procedure for clad pipe girth welds subjected to bending load Rodolfo F. de Souza a, ∗ , Claudio Ruggieri b , Zhilhiang Zhang c a University of Sao Paulo, PVN-EPUSP, Sao Paulo, Brazil b University of Sao Paulo, PVN-EPUSP, Sao Paulo, Brazil c Norwegian University of Science and Technology, NTNU, Trondheim, Norway Abstract This work describes a crack driving force estimation procedure applicable for structural integrity assessments of dissimilar girth welds in clad pipes subjected to high levels of bending load. The purpose of this study is to explore the application of the equivalent stress-strain relationship approach coupled with a weld bevel simplification scheme and the EPRI procedure to evaluate the CTOD for defects located at the weld centerline, including the e ff ects of the weld strength mismatch, weld bevel geometry and the clad layer thickness. Parametric 3D finite element analyses of pipes with circumferential part-through cracks are performed to validate the weld joint simplification and to assess the accuracy of the crack driving forces predictions. Finally, the results show that the estimations using the proposed methodology are in close agreement to those obtained directly from finite element analyses. c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Weld Strength Mismatch; Pipeline Girth Welds; CTOD; ECA Procedures Structural integrity assessment of o ff shore pipelines conducting highly corrosive fluids has become a challenging engineering issue due to the increasing oil and gas production in harsh service conditions, such as very deep water o ff shore reservoirs. Ongoing technology developments support the use of C-Mn steel pipelines with a internal corrosion resistance alloy (CRA) layer, which is either metallurgically bonded to the outer pipe (clad pipe) or held in place by interference stress (lined pipe). While e ff ective against corrosion, they require the use of CRA filler to produce field girth welds thereby introducing additional complexity in fracture assessments and specifications of critical crack sizes due to the dissimilar mechanical properties of the materials. Moreover, o ff shore pipelines are subjected to severe installation conditions to enhance the operational productivity and reduce field development costs. A case of interest is the reel-lay method, in which the welded flowline is coiled around a large diameter reel on a vessel and transported to the deployment location into the sea where the pipe is 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy esti ation procedure for clad pipe girth elds subjected to bending load odolfo F. de Souza a, ∗ , laudio uggieri b , Zhilhiang Zhang c a University of Sao Paulo, PVN-EPUSP, Sao Paulo, Brazil b University of Sao Paulo, PVN-EPUSP, Sao Paulo, Brazil c Norwegian University of Science and Technology, NTNU, Trondheim, Norway Abstract This work describes a crack driving force estimation procedure applicable for structural integrity assessments of dissimilar girth welds in clad pipes subjected to high levels of bending load. The purpose of this study is to explore the application of the equivalent stress-strain relationship approach coupled with a weld bevel simplification scheme and the EPRI procedure to evaluate the CTOD for defects located at the weld centerline, including the e ff ects of the weld strength mismatch, weld bevel geometry and the clad layer thickness. Parametric 3D finite element analyses of pipes with circumferential part-through cracks are performed to validate the weld joint simplification and to assess the accuracy of the crack driving forces predictions. Finally, the results show that the estimations using the pr posed methodology are i close agre ment to those obtained directly from finite element analyses. c 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Weld Strength Mismatch; Pipeline Girth Welds; CTOD; ECA Procedures 1. Introduction Structural integrity assessment of o ff shore pipelines conducting highly corrosive fluids has become a challenging engineering issue due to the increasing oil and gas production in harsh service conditions, such as very deep water o ff shore reservoirs. Ongoing technology developments support the use of C- n steel pipelines with a internal corrosion resistance alloy (CRA) layer, which is either metallurgically bonded to the outer pipe (clad pipe) or held in place by interference stress (lined pipe). hile e ff ective against corrosion, they require the use of CRA filler to produce field girth welds thereby introducing additional complexity in fracture assessments and specifications of critical crack sizes due to the dissimilar mechanical properties of the materials. 21st uropean onference on Fracture, F21, 20-24 June 2016, atania, Italy esti ation procedure for clad pipe girth elds subjected to be i l d odolfo F. de Souza a, ∗ , Claudio uggieri b , Zhilhiang Zhang c a University of Sao Paulo, PVN-EPUSP, Sao Paulo, Brazil b Unive sity of Sao Paulo, PVN-EPUSP, Sao Paulo, Brazil c Norwegian University of Science and Technology, NTNU, Trondheim, Norway Abstract This work describes a crack driving force esti ation procedure applicable for structural integrity assessments of dissimilar girth welds in clad pipes subjected to high levels of bendi g load. The purpose f this study is to expl re the application of the equivalent stress-strain relationship approach coupled with a weld bevel simplification scheme and the EPRI procedure to evaluate the CTOD for defects located at the weld centerline, including the e ff ects of the weld strength mismatch, weld bevel geo etry and the clad layer thickness. Para etric 3D finite ele ent analyses of pipes with circu ferential part-through cracks are performed to validate the weld joint si plification and to assess the accuracy of the crack driving forces predictions. Finally, the results show that the esti ations using the proposed ethodology are in close agreement to those obtained directly from finite element analyses. c 2016 The Aut ors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Co ittee of ECF21. Keywords: eld Strength ismatch; Pipeline Girth elds; CTOD; ECA Procedures 1. Introduction Copyright © 2016 The Authors. Published by Elsevier B.V. This is a open access article under the CC BY-NC-ND license (http://cr ativec mmons.org/licenses/by-nc-nd/4.0/). r-review under responsibility of the Scientific Committee of ECF21. © 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 1. Introduction