Master thesis: Experimental study of fretting fatigue in additive manufacturing component

Job Description

Are you a master student planning to write your Master Thesis during autumn 2019?

Join us on our journey into the future #FutureMakers#Siemens


Be part of an open and dynamic workplace where professional and personal development is high on the agenda. By making sustainable energy solutions more cost effective, developing new technologies for the future's smart industry we make reality of our vision of a sustainable world.

We are now looking for a student to take on the assignment of “Experimental study comparing the risk for fretting fatigue in a component produced by additive manufacturing to that by a conventional method”

The master thesis work will be carried out partly at the department of Solid Mechanics, KTH, Stockholm, and partly at the department within gas turbine R&D at Siemens Industrial Turbomachinery in Finspång responsible for aeromechanics.

Additive Manufacturing (AM) is a collective name that is used to describe technologies that build 3D objects by adding layer-upon-layer of material, whether the material is plastic, metal or concrete. The AM process for metals can be classified into two categories: powder bed (PB) and flow-based technique. The PB process covers the electron beam melting (EBM) and selective laser melting (SLM), while flow-based method includes the laser-engineered net shaping (LENS), direct metal deposition (DMD) and direct metal laser sintering (DMLS). 

A material produced using an AM technology may attain different properties than a material produced in a conventional way. Among others it is of great industrial interest to understand how the risk for and behavior of contact fretting fatigue will change.

Fretting fatigue is one of the major damage modes in the fan and compressor stages of gas turbines. The compressor blades are joined to the rotating disk through an oblique contact where the mass forces from rotation fixes the blade tail to the disk. The combined normal and cyclic tangential contact loads inevitable lead to the so-called fretting fatigue damage where a fatigue crack may load to the loss of compressor blade and subsequent complete engine failure.

This thesis work aims at studying the contact fretting fatigue behavior of TI6Al4V in combination with alloy steel 259655. The specimens will be manufactured using additive manufacturing (EBM) as well as a conventional method (forging). The goal is to determine the relative fretting fatigue risk in the additive manufactured blade joint compared to the traditional material.

The work will include the design, performance and evaluation of fretting fatigue experiments. The experiments will be evaluated using FEM.

Your Profile: 

You should have good knowledge of:

Solid Mechanics

FEM, preferably in the following programs: ABAQUS or COMSOL.

Analytical and practical skill

Application

Do not hesitate - apply today via siemens.se/jobb ref nr 113303 and no later than June 20. For questions about the master thesis please contact the hiring manager: Patrik Rasmusson, patrik.rasmusson@siemens.com or 070-2079546.

Type of contract: 
Fixed term – approximately 6 months.   

Trade Union representatives:
Veronica Andersson, Unionen, 0122-840 21
Simon Von Eckardstein, Sveriges Ingenjörer, 0122-842 24
Jan Lundgren, Ledarna, 0122-812 33
Kenth Gustavsson, IF Metall, 0122-815 25

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In this recruitment we renounce all calls relating to advertising and recruitment support.



Job ID: 113303

Organization: Gas and Power

Company: Siemens Industrial Turbomachinery AB

Experience Level: Student (Not Yet Graduated)

Job Type: Full-time

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