Master thesis "Calculation model for bolted joints with spring washers" 




IFE is the worldwide leading manufacturer of automatic entrance systems for railway vehicles. Wouldn’t it be great to play an active part in shaping the future of mobility? 




  • In IFE, a standard bolted joint consists of a hexagon or cap screw, a nut and a spring washer (under the head and under the nut).

  • According to the rail vehicle standard DIN 25201, safety-critical bolted joints must be verified by calculation.

  • The calculation of bolted joints is defined in the internationally recognized guideline VDI 2230. However, VDI 2230 does not consider spring washers.



  • Research of already known calculation approaches for the consideration of spring washers in bolted connections from the technical literature

  • Measurement of the spring characteristic for different spring steel and stainless steel washers used in IFE

  • Determination of a method for the consideration of the spring washer effect in a manual bolt calculation based on VDI 2230

  • Determination of a method for consideration of the effect of the spring washer in an FE calculation with Ansys in accordance with VDI 2230

  • Documentation of the measurements and the developed calculation methods

  • Presentation of the results



  • Studies at a technical university or university of applied sciences

  • Basic knowledge of bolt calculation and finite element analysis

  • Initiative

  • Solution-oriented working method



Continuous innovation pushes the technological progress of our automatic entrance systems, which are geared towards quality, safety and reliability, and distinguishes us as an internationally reliable partner. 
We offer you an exciting and varied job in an international environment as well as an attractive set of benefits. These range from flexible working time models (up to 50% homeoffice) through professional and personal development opportunities to sports and health care programmes.


The collective agreement minimum salary for this position is EUR 2.057,00 gross per month on a full-time basis.



Apply now online if you want to advance in a strong team. We look forward to receiving your application.