MTU Aero Engines develops, manufactures, sells and services commercial and military propulsion systems for airplanes and helicopters, as well as industrial gas turbines. The key to our success is developing the propulsion systems of tomorrow —even more economical, lower in emissions and quieter. With roughly 10,000 employees, we are present around the world, but we make our home in Germany. You, too, can become part of our dedicated Team:
Write of a master thesis (m/f/d): Three Dimensional Mixed-Mode Crack Propagation Calculations without Updated Stress Fields
Aircraft engines are influenced by different environmental circumstances. The occurrence of Foreign Object Damage at airfoils is unavoidable during operation. To take this into account a damage tolerant design is necessary. Part of the substantiation of damage tolerance are 3D crack propagation analyzes. At MTU this is done by a finite element method based in-house tool called Cracktracer3D.
To determine the crack propagation direction the K-values have to be calculated. Within the code collapsed elements are implemented. With the help of these elements the elastic singularity at the crack front can be represented and the K-values can be determined. Once calculated the crack front can be updated. This updated crack front has to be introduced into the original geometry free of cracks. For a complete analysis many calculation increments are necessary. Since the introduction of the updated crack front is time consuming a different K-value calculation based on the uncracked stress field was implemented.
The purpose of the master thesis is the validation of a K-value determination procedure which is based on the uncracked stress field. Furthermore potentials for code acceleration shall be investigated and implemented. Additionally a geometry dependent shape factor based on an 1D crack propagation approach shall be investigated.
- Determination of geometry dependent shape factors
- Validation of an uncracked stress field based K-value determination for LCF calculations with the help of test examples
- Identification of robust calculation parameters
- Determination and implementation of code acceleration potentials
- Application of real engine components and comparison to Cracktracer3D calculations
- Major in engineering, mathematics or physics
- Experience with the finite element method
- Knowledge in mechanics, especially fracture mechanics
- Programming experience in FORTRAN, C, C++, Python or related languages
- Willing to get familiar with an existing code
- Duration: 6 months
- Insights into practical work in aviation as an innovative, high-tech industry
- Exciting jobs that carry responsibility and are performed in an atmosphere of team spirit
- A personally assigned contact and individual support services
- Flexible working hours and compensatory time off
- Networking opportunities
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