Siemens Energy

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This master thesis investigates two common ways of representing driving forces for crack growth in finite element (FE) fracture analyses: (i) applying explicit crack-face tractions and (ii) prescribing residual stresses/strains. The work will compare how these approaches influence computed fracture parameters (stress intensity factors) across representative geometries and loading scenarios relevant to high temperature components. A second focus is to develop robust global-local (sub-modeling) workflows to capture local crack-tip fields with high fidelity while keeping overall models computationally efficient. The scope of the work may be extended to investigate the stress redistribution that may occur on a cracked body and its influence on crack growth.

How You’ll Make an Impact

• Perform a literature and best-practice review on modelling crack growth drivers: crack-face tractions versus residual stress/strain fields.

• Define representative case and establish verification benchmarks (closed-form solutions/handbooks where available).

• Implement FE analyses to compute stress intensity factors (K) using Franc3D/Abaqus.

• Quantify differences between loading representations (tractions vs. residual fields) on crack-tip parameters, crack path/angle selection (mixed-mode), and predicted growth life via Paris/Walker or TMF/creep-fatigue laws.

• Assess pitfalls such as double-counting loads, non-self-equilibrated residual fields, path dependence with plasticity, and contact-induced shielding/anti-shielding.

• Develop submodeling procedures: map global displacements/temperatures to local crack models, transfer residual stresses or equivalent boundary conditions, and evaluate accuracy vs. full-scale reference solutions.

• Deliver modelling guidelines, parameter identification steps for residual fields, and a decision framework indicating when each approach is appropriate in high temperature applications.

What You Bring

• Currently enrolled in a master's program in mechanical engineering, materials science, aerospace engineering, or a related field.

• Solid understanding of solid mechanics and constitutive modelling (elastic-plasticity, creep/viscoplasticity, cyclic plasticity).

• Knowledge of fracture mechanics (LEFM/EPFM).

• Experience with finite element analysis (e.g., Abaqus/Ansys) and scripting for data reduction/parameter fitting (e.g., Python, MATLAB).

• Familiarity with high-temperature materials (e.g., Ni-based superalloys) and thermo-mechanical fatigue concepts is a plus.

• Strong analytical mindset, attention to detail, and clear technical communication skills.

About the Team

In our team (Computer Aided Engineering of Combustion Systems) we have many talented and highly educated engineers with different backgrounds and responsibilities. We strive to support each other and build a strong technical knowledge within the team. We collaborate closely with the turbine and compressor MI department, and our team includes specialists in the field who are available to provide support.

Our Gas Services division offers Low-emission power generation through service and decarbonization. Zero or low emission power generation and all gas turbines under one roof, steam turbines and generators. Decarbonization opportunities through service offerings, modernization, and digitalization of the fleet.

Who is Siemens Energy?

At Siemens Energy, we are more than just an energy technology company. With ~100,000 dedicated employees in more than 90 countries, we develop the energy systems of the future, ensuring that the growing energy demand of the global community is met reliably and sustainably. The technologies created in our research departments and factories drive the energy transition and provide the base for one sixth of the world's electricity generation. 

Our global team is committed to making sustainable, reliable, and affordable energy a reality by pushing the boundaries of what is possible. We uphold a 150-year legacy of innovation that encourages our search for people who will support our focus on decarbonization, new technologies, and energy transformation. 

Find out how you can make a difference at Siemens Energy: https://www.siemens-energy.com/employeevideo

Our Commitment to Diversity

Lucky for us, we are not all the same. Through diversity, we generate power. We run on inclusion and our combined creative energy is fueled by over 130 nationalities. Siemens Energy celebrates character – no matter what ethnic background, gender, age, religion, identity, or disability. We energize society, all of society, and we do not discriminate based on our differences.

Application

Don’t hesitate – apply via the Apply button, id nr 283722 no later than 2025-11-11.

Ongoing selection is applied, the role might be filled before last application date.

For questions about the role, please contact the supervisor Jordi Loureiro on jordi.loureiro@siemens-energy.com or recruiting manager Emma Moschner on emma.moschner@siemens-energy.com

For questions about the recruitment process please contact the responsible recruiter Ermina Imamovic on ermina.imamovic.ext@siemens-energy.com

We refrain from all contact with staffing and recruitment companies, or advertising brokers.

Location: Finspång

Trade Union Representatives:
Unionen, unionen.finspang.se@siemens-energy.com
Sveriges Ingenjörer & SACO, asi.se@siemens-energy.com
Ledarna, Anders Fors, anders.fors@siemens-energy.com
IF Metall, Mikael Malmgren, mikael.malmgren@siemens-energy.com

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