PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 194 –1946 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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 Effect of Different Cold Working Plastic Hardening on Mechanical Properties of 316L Austenitic Stainless Steel Shuai Wang, He Xue*, Yinghao Cui, Wei Tang, Xiaoyan Gong School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China It is the important foundation data that the material mechanics properties parameters in the important structure integrity evaluation and safety analysis. Since cold working will change the mechanical parameters of the local region material, and these local regions often play an important role in structural integrity analysis. To obtain the preliminary data of the mechanical parameters with different cold deformation, the relation of the cold deformation and mechanical parameters of 316L austenitic stainless steel is analyzed by combining the theoretical analysis, numerical simulation and uniaxial tensile testing in this paper. The investigated results indicate that the cold working will increase the yield stress of the material to some extent, but has little effect on the reduction factor. The approach proposed in this paper could be used to preliminary estimate the mechanical properties parameters of materials subjected to cold working in the important engineering structures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Material mechanics properties; El stic-plastic FEM simul tion; Cold working; 316L austeniti stainless steel; Mechanical experiment 1. Introduction Structural integrity analysis is one of the important guarantees for the safe service of key mechanical structures. Accurately measuring the mechanical parameters of materials in actual engineering structures is an important basis for analyzing the structural integrity of engineering structure. Non-uniform heating and cooling during the welding process can cause cold work hardening in the base material, and the cold bending process of the pipe also changes the material properties of t e elbow pipe. Cold work hard ning will change the mechanical properties of the material, resulting in non-uniform mechanical properties in the engineering structure, causing the initiation and expansion of micro-cracks and the structure failure [1-3]. The influence of cold work hardening on the local mechanical parameters of the material is difficult to obtain by experimental means, in view of the relatively easy performance of the uniaxial tensile test of the material, it is a easy method to obtain the mechanical properties of 316L austenitic stainless steel with different cold working by using the uniaxial tensile test combined with elastic-plastic finite element method. ECF22 - Loading and Environmental effects on Structural Integrity Effect of Different Cold Working Plastic Hardening on Mechanical Properti s of 316L Austenitic Stainless Steel Shuai Wang, He Xue*, Yinghao Cui, Wei Tang, Xiaoyan Gong School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China Abstract It is the important foundation data that the material mechanics properties parameters in the important structure integrity evaluation and s fety analysis. Since cold working w ll change the mechanical para eters of the local region material, and these local regions often play an important role in structural integrity analysis. To obtain the preliminary data of the mechanical par meters with different cold deformation, the rela ion of he cold deformati n and mechanical parameters 316L auste itic st inless steel is analyzed by combining the oretical analysis, num rical simul tion and u iaxial tensil testing in this paper. The inve tigated results indicate that the cold w king will increase the yield stress f the material to some xtent, but has little eff ct on the reduction factor. T e approach proposed in this paper coul be used to preliminary estimate the mechanical properties parameters of materials subjected to cold working in the important engineering structures. © 2018 The Authors. Publishe by Elsevier B.V. Peer-review under res onsibili y of the ECF22 organizers. Keywords: Material mechanics properties; Elastic-plastic FEM simulation; Cold working; 316L ustenitic stainless steel; Me hanical experiment 1. Introduction Structural integrity analysis is one of the important guarantees for the safe service of key mechanical structures. Accurately measuring the mechanical parameters of materials in actual engineering structures is an important basis for analyzing t structural integrity of engineering structure. Non-uniform heating and cooling during the welding process can cause cold wo k hardening in th bas material, and the cold bending process of the pipe also changes the material properties of the elbow pipe. Cold work hardening will change the mechanical properties of the material, resulting in non-uniform mechanical properties in the engineering structure, causing the initiation and expansion of micro-cracks and the structure failure [1-3]. The influence of cold work hardening on the local mechanical parameters of the material is difficult to obtain by experimental means, in view of the relatively easy performance of the uniaxial tensile test of the material, it is a easy method to obtain the mechanical properties of 316L austenitic stainless steel with different cold working by using the uniaxial tensile test co bined with elastic-plastic finite element method. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 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. Abstract

* 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 responsibility of the ECF22 organizers.

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.2018.12.267