Karriere am WZL


Masterarbeit oder Bachelorarbeit oder Projektarbeit

am Forschungsbereich Technologie der Fertigungsverfahren, Abteilung Umformen, Research Group Forming Technologies

Fatigue analysis of hammered materials by means of finite element modelling

Initial situation

The component surface layer is often the most heavily stressed area of a metallic workpiece. For this reason, local modification of the component surface is recommended to improve the workpiece properties such as fatigue strength. One way of improving the mechanical properties in the surface layer is to use mechanical surface layer machining processes such as machine hammer peening (MHP) .

MHP is an incremental forming process, which is characterized by high-frequency impacts of a spherical plunger head on a workpiece surface. This induces compressive residual stresses in the workpiece, smoothes the surface and achieves strain hardening in the component surface layer.

Load test benches are used to investigate the influence of MHP on the fatigue life of hammered workpieces. These test rigs allow the analysis of fatigue strength, for example, using a large number of hammered workpieces. However, the extensive experimental test series and the high use of materials make the determination of fatigue strength a very time- and cost-intensive subject.

A possible approach to reduce the high temporal and monetary effort is the use of numerical methods such as the finite element method (FEM). The FEM enables the analysis of stress-strain states on loaded components and thus allows conclusions to be drawn about localized load peaks which are responsible for component failure. Due to the innovative character of the MHP, the effects of hammered surface layers on the fatigue properties of the components have not yet been investigated.

The aim of this work is therefore to create an FE model for the calculation of fatigue strength of hammered workpiece surface layers based on the finite element (FE) software ABAQUS and its extension FE-SAFE.

Bid is made:

- Independent time management
- Comprehensive support
- Clearly defined tasks
- Familiarization with the FE software ABAQUS and its extension FE-SAFE
- Support in career planning and internship search
- Interest in the FEM
- Motivation and commitment
Zeitaufwand: 11,00 Arbeitsstunden

Robby Mannens, M.Sc. RWTH Aachen
Cluster Produktionstechnik 3A 342
Tel.: +49 241 80-28244
Fax: +49 241 80-628244
Mail: R.Mannens@wzl.rwth-aachen.de