Master Thesis | Mechanical Integrity | Experimental Study of Fretting

Master Thesis | Mechanical Integrity | Experimental Study of Fretting Fatigue

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The assignment:

The master thesis work is a collaboration between the WE EI department at Siemens Energy in Finspång, and the department of Solid Mechanics, KTH, Stockholm. The WE EI department is responsible for aeromechanics within gas turbine R&D.

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). 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 performance and evaluation of fretting fatigue experiments. The experiments will be carried out at the department of Solid Mechanics, KTH, Stockholm. The experiments will be evaluated using FEM.

Your Profile:

The project fits you who have good knowledge of…
* Solid Mechanics
* FEM, preferably in ABAQUS
* Analytical and practical skill

Why should you be working at Siemens?

Siemens Energy is one of the world’s leading energy technology companies. The company works with its customers and partners on energy systems for the future, thus supporting the transition to a more sustainable world. With its portfolio of products, solutions and services, Siemens Energy covers almost the entire energy value chain – from power generation and transmission to storage. The portfolio includes conventional and renewable energy technology, such as gas and steam turbines, hybrid power plants operated with hydrogen, and power generators and transformers. More than 50 percent of the portfolio has already been decarbonized. A majority stake in the listed company Siemens Gamesa Renewable Energy (SGRE) makes Siemens Energy a global market leader for renewable energies. An estimated one-sixth of the electricity generated worldwide is based on technologies from Siemens Energy. Siemens Energy employs 91,000 people worldwide in more than 90 countries and generated revenue of around €29 billion in fiscal year 2019. In Sweden Siemens Energy has 2600 employees in 10 locations.

At Siemens we value diversity by inclusion and by cooperating with people with different mindset, background, experience, competence and personal traits – in all organisational levels.

Read more about Siemens here:

www.siemens-energy.com.

Application

Do not hesitate - apply today via https://jobs.siemens-energy.com/jobs, refnr 221411 and no later than November 6^th. For questions about the role please contact recruiting manager Karamveer Singh Kumar +46 (122) 82772 or for questions about the recruitment process contact Eva Nilsson on eva.e.nilsson@siemens.com

Place of work: Finspång

Trade Union representatives:
Veronica Andersson, Unionen, 0122-840 21
Simon Von Eckardstein, Sveriges Ingenjörer, 0122-842 24
Jan Lundgren, Ledarna, 0122-812 33
Jonny Persson, IF Metall, 0122-817 69