Our lab is always looking for motivated students wishing to discover computational solid mechanics through challenging research topics and/or practical applications. We try to provide unique project subjects, tailored to the student and related to research relevant to the laboratory, such as:
The complete list of available projects can be found below shortly before each semester. We often engage in collaborations with other labs and universities. We are also open to suggestions for project topics. If you have an idea for a project you wish to do within our lab, don’t hesitate to contact us.
Master’s semester projects – Spring 2024
For master’s theses and more semester projects, you can contact [email protected]. Don’t hesitate to check out previous projects on infoscience.
Deep drawing is common process in high volume production of sheet metal components for the automotive and consumer goods industry. In this process, a sheet is pulled into a forming die by the mechanical action of a punch, secured in place between the die and the binder. The complexity of the parts feasible depends on the deformation and fracture bulk properties of the sheet material used. But in addition, the friction in the contact areas between the sheet and the forming tools plays a very crucial role. Intriguingly, friction can be beneficial as it controls the flow, preventing wrinkles. However, excessive friction will cause splitting of the parts.
In this project, mechanical strip draw tests are used as experiments to quantify the friction response of combinations of contact partners typical for deep drawing, i.e., sheet metal, tool and lubricant (tribological system). Previous investigations demonstrate that the friction response to different testing conditions, such as contact normal pressure and sliding velocity is quite nonlinear and cannot be sufficiently described by simple linear models such as Coulomb friction. Furthermore, it was concluded that the frictional shear stress distribution in the contact area of a strip-draw tests is inhomogeneous.
The objective of this work is the development of a reverse engineering method for the inhomogeneous frictional shear stress distribution in a strip-draw tests. Based on this method, existing and new strip-draw tests shall be evaluated. The resulting data base shall be analyzed, and, under consideration of continuum mechanical principles, a suitable new frictional contact model shall be derived, which is able to model the behavior observed in the experiments. If time allows, the new contact model shall be implemented as user subroutine into an existing FEA code. Finally functioning of the code is demonstrated in simulation examples.
This project is undertaken in collaboration with Novelis Switzerland, a leading supplier of highly specialized aluminum sheet products for the automotive industry.
Earthquakes can be devastating, both in terms of human and material damage. Although their existence has been known since the dawn of time, the physics of earthquakes is still poorly understood. Natural faults and earthquake characteristics are known to follow scaling power-law. The origin of this phenomenon has strong implications on the physical mechanisms driving slip events. However, it is not yet clear. The emergence of complexity can be related to the disorder of the system. Understanding if the observed complexity comes from the inherent complexity of the frictional motion or the system’s complexity is essential to better understand – and one day eventually predict – earthquakes. It has been shown numerically with a simple system without any disorder that resulting slip events follow a power-law distribution for the small events – like natural slip events – and a log-normal distribution for the larger ones. This project aims to study how adding disorder in this simple system will influence the transition between the power-law and the log-normal distribution of slip events. To do so, the student will use a finite element software developed in the lab (Akantu).
Extreme loads on solids lead to the formation of a multitude of cracks that propagate, branch and coalesce to form fragments. This process is called dynamic fragmentation. This process is of importance in many domains of engineering, where it is fundamental to predict the outcome of high velocity impacts or explosions. Often, one would like to extract statistics such as fragment size distribution. This project will feature experiments on object breaking into pieces to extract experimental statistics on fragments. The student will then use a finite element software (Akantu) to simulate crack propagation using different methods such as phase-field modelling of fracture or cohesive elements. The statistics obtained numerically will be compared to the experimental ones to highlight the advantage and limitations of the different simulation methods.
The impact of a drop on a solid surface is a canonical problem in fluid mechanics of fundamental significance in numerous natural and industrial processes, such as ink-jet printing, aircraft icing and spray cooling. Recently we found out soft solids display a similar behavior when colliding with a rigid surface. Namely, the contact is not made on the tip, but on an annular radius, with air trapped in between. This project will explore the scenario of highly viscous droplets and soft solids impacting on each other. The student will use the finite element software (Comsol Multiphysics) to simulate the dynamics using knowledge of both fluid and solid mechanics. Depending on the interest of the student the project will focus either on full 3D simulations to capture symmetry breaking or on axisymmetric ones to investigate the feasibility of using level-set or phase field simulation for droplet-air interface.