PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 982–987 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Nonlinear solid mechanics: applications to loading of structures in damaged materials Vera Turkova a, * a Samara National Research University, Moskovskoe shosse 34, Samara, 443086, Russian Federation Abstract Nowadays the damage and failure of the material are of critical interest to designers of engineering structures, as there is a lack of methods for accurate failure prediction and damage analysis. Especially for early stages of the design process, a quick way of estimating material behavior is needed. There is a need for a material model coupled with a damage evolution law. In the paper a damage model, based on continuum damage mechanics, is presented. The material law is implemented computationally as a user defined subroutine (UMAT) in a commercially available FEM package Simulia Abaqus. The active damage accumulation zone for rod specimen is analyzed. Distribution of each damage component is given. © 2018 The Authors. Published by Elsevier B.V. Peer-review under respo sibility of the ECF22 organizers. Keywords: damage analysis, continuum damage mechanics, subroutine UMAT, damage accumulation zones 1. Introduction. Description of damage accumulation processes in solids Fracture mechanics is the field of so id chanics that deals with the behavior of cracked odi s subject d to stresses and strains. These can arise from primary applied loads or secondary self-equilibrating stress fields (e.g., residual stresses). For engineering materials, such as metals, there are two primary modes of fracture: brittle and ductile. The fracture process zone is the region around the crack tip where dislocation motions, material damage occur. It is a region of nonlinear deformation. Different theories have been advanced to describe the fracture process in order to develop predictive capabilities: Linear Elastic Fracture Mechanics, Cohesive zone models, Nonlinear Fracture Mechanics, etc. (Murakami [1]). ECF22 - Loading and Environmental effects on Structural Integrity Nonlinear solid mechanics: applications to loading of structures in damaged materials Vera Turkova a, * a Samara National Research University, Moskovskoe shosse 34, Samara, 443086, Russian Federation Abstract Nowadays the damage and failure of the material are of critical interest to designers of engineering structures, as there is a lack of metho s for accurate f ilure prediction and damage analysis. Especially for early stages of the design process, a quick way of estimating material behavior is needed. There is a n ed for a material model coupled with a damag evoluti n law. In the paper a damage model, b sed on continuum damag mechanics, is pr sented. The mat ial la is implement d comput tionally as a user efined subroutine (UMAT) i a commercially av ilable FEM package Si ulia Ab qus. The active amage accumulation zone for rod specimen is analyzed. Distribution of each damage component is given. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: damage analysis, continuum damage mechanics, subroutine UMAT, damage accumulation zones 1. Introduction. Description of damage accumulation processes in solids Fr ct re me hanics is the field of solid mechanics that eals the behavior of cr cked bodies subje ted to stresses and strains. These can arise fr m primary applied loads or secondary self-equilibrating str ss fields (e.g., residual stresses). For engineering materials, such as metals, there are two primary modes of fracture: brittle and ductile. The fracture process zo e is the region around the crack tip where dislocation motions, material damage occur. It is a region of nonlinear deformation. Different theories have been advanced to describe the fracture process in order to develop predictive capabilities: Linear Elastic Fracture Mechanics, Cohesive zone models, Nonlinear Fracture Mechanics, etc. (Murakami [1]). © 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.: +89276544393. E-mail address: turkova.ver@yandex.ru * Corresponding author. Tel.: +89276544393. E-mail ad ress: turkova.ver@yandex.ru

* 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.2018.12.183