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 Structu al Integrity 13 (2018) 45 –455 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralI tegrity 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 High velocity impact response of 3D hybrid woven composites Ahmed Sohail*, Zheng Xitao, Shiekh Muhammad Zakir School of Aeronautics, Northwestern Polytechnical University, Xi’an PR China The aim of this work is to develop an efficient numerical model which can predict the behavior of 3D hybrid woven composites under high velocity impact by utilizing the inbuilt constitutive and damage models within the finite element software. To predict the constitutive and damage behavior of composites during the high velocity impact process, a combination of cohesive contact and continuum shell elements is proposed in finite element (FE) model. Delamination behavior is characterized by introducing the cohesive contact between the two adjacent laminas using the traction separation law, while damage, induced during the impact process in each single layer of composite laminate, is depicted by continuum shell elements with Hashin failure criterion. Connector elements containing the failure behavior are introduced into the model to represent the z-yarns of the 3d woven composite. The proposed FE model reveals good capturing of damage phenomenon during the impact process and indicates good agreement with experimental results, making it a valuable tool for characterizing the impact response of 3D hybrid woven composites under high velocity impacts. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: 3D woven composites; Hybrid; Finite element analysis; Impact behaviour © 2018 The Authors. P blished by Elsevier B.V. Peer-review und responsibility of the ECF22 organiz rs. ECF22 - Loading and Environmental effects on Structural Integrity High velocity impact response of 3D hybrid woven composites Ahmed Sohail*, Zheng Xitao, Shiekh Muhammad Zakir School of Aeronautics, Northwestern Polytechnical University, Xi’an PR China Abstract The aim of this work is to develop an efficient numerical model which can predict the behavior of 3D hybrid woven composites under high velocity impact by utilizi g the inbuilt constitutive and damage mo els within the finite element software. To redict the constitutive and damage behavior of composites during the high velocity impact process, a combination f cohesive conta t and contin um shell lements is proposed in finit element (FE) mod l. Dela in tion behavior is characterized by introducing the cohesive contact between the two adjacent laminas using the traction separ ti law, while dam ge, induced during the impact proc ss i each single lay r of composite l i te, is depicted by continuum shell elements with Hashin failure criterion. Connector elements containing the failure behavior are introduced into the model to repres t the z-yarns of the 3d woven composite. The proposed FE model reveals good capturing of damage phenomen n during th impact process and indicates good agreement with ex erimental results, making it a valuable tool for c aracterizi g the impact response of 3D hybrid woven composites under high velocity impacts. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: 3D woven composites; Hybrid; Finite element analysis; Impact behaviour 1. Introduction High stiffness and strength in the in-plane and through-thickness directions makes the 3D woven composites widely used material in the engineering structures. Compared to the other 3D textile architectures 3D orthogonal oven composites exhibits less crimping behavior of the yarns, which leads to the improved elastic and impact © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. High stiffness and strength in the in-plane and through-thickness directions makes the 3D woven composites widely used material in the engineering structures. Compared to the other 3D textile architectures 3D orthogonal woven composites exhibits less crimping behavior of the yarns, which leads to the improved elastic and impact Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: +0086-15691970571. E-mail address: s.ahmed@mail.nwpu.edu.cn * Corresponding author. Tel.: +0086-15691970571. E-mail ad ress: s.ahmed@mail.nwpu.edu.cn

* 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.2018.12.075