Master Thesis stress-time histories
vor 4 Wochen
Beschreibung der Stelle
Berufsfeld
R - RESEARCH & DEVELOPMENT - R1 - F&E-Management
Stellentitel
Master Thesis stress-time histories (m/w/d)
Vertragsart
Praktikum & Abschlussarbeit
Aufgabenbeschreibung
„Determination of temperature and stress-time histories for thermally loaded pipes“
Your work will contribute to the determination of stress-time histories for thermo-mechanical piping loads.
Contents of the master thesis (topic) are as follows:
Framatome disposes of decades of experience in the fatigue monitoring of power plant components based on the local measurement of the operational thermo-mechanical loads. The methods are subject to permanent amendment, improvement and development.
The load measurements can be based on thermocouples arranged in measurement sections which are attached to the outer wall of the pipe, on displacements or – as part of latest development efforts – on electromagnetic transducers (EMAT’s). Although the load measurement is fairly local there is always the task of transferring the load information to the location of interest (i.e. the location of potential fatigue damage) and at least to the inner wall of the pipe. Subsequently, the stress-time-history of the complete stress tensor at the relevant location has to be derived and is used for rainflow cycle counting and calculation of partial and cumulative fatigue usage factors (CUF’s). The speed of execution is another related topic and subject of Framatome’s Fast Fatigue Evaluation (FFE) solution.
The work will emanate from a comprehensive literature study including the latest published research and development results of local fatigue monitoring. Based on the acquired knowledge a solution for the determination of inner wall temperatures, displacements and stresses is to be developed. Input data are available information on outer wall and / or mean wall temperatures and / or displacements. The analytical solution with Bessel’s functions of Albrecht [1] is to be taken explicitly into account. Furthermore, artificial intelligence (AI) approaches for supporting the problem solution have to be checked. The proposed solution is to be implemented in a well documented, quality controlled and further usable software (Python). The speed of execution is to be proven. For validation purposes the available results of measurements at a pipe test rig subjected to different defined thermal transients are to be used. The applicability for fast transients is to be shown in particular.
Proposals of integrating the established solution into the existing fatigue assessment modules are to be made.
All steps have to be specified and documented. Further proposals for improvement should be made. The final thesis will meet the requirements of integrating the module in the existing fatigue monitoring system.
Anforderungen
highly motivated student of mechanical engineering, technical mechanics or maths fluent in English basic knowledge of thermodynamics and strength of materials advanced knowledge of analytical and numerical mathematics independent, structured and purposeful work under regular supervision basic knowledge of Finite Element Method (ANSYS) solid knowledge of technical software development (Python)
Regelmäßige Arbeitszeit
Vollzeit
Qualifikation
Höchster Bildungsabschluss
Abitur
Berufserfahrung
In Ausbildung / Berufseinstieg
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