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Claas Bierwisch

Fraunhofer IWM, Freiburg, Germany

Position: Team Leader

Department: Manufacturing Processes

Field of research: Engineering (Mechanical engineering)


List of content:

Angles of repose observed in heap (de-)construction

Co-Authors: T. Kraft, H. Riedel, M. Moseler
In a Discrete Element Method (DEM) simulation angles of repose are analyzed which reveal static properties of a granular material. The theoretical maximum angle is related to the internal angle of friction of the material, $\phi = ...

Views: 1111

Die filling of a seal disc cavity

Co-Authors: T. Kraft, H. Riedel, M. Moseler
Dry pressing and subsequent sintering in order to shape metallic or ceramic powders is characterized by its high dimensional accuracy. The homogeneous filling of the die prior to compaction is an important prerequisite for maintai ...

Views: 857

Erosive wear in bent pipes

Erosive wear occurs in many processes involving particles which hit a wall with large relative velocities. Even though the material removal for each impact is very small the collective damage is often significant. The video displa ...

Views: 1035

Discrete and finite element co-simulation

Co-Authors: C. Dehning, T. Kraft
The possibility of coupling discrete element method (DEM) and finite element analysis (FEA) simulations is particularly attractive in order to model contact between granular matter and soft bodies. The coupling takes place at the ...

Views: 1245

Brittle fracture in three point bending test

Simulation of a three point bending test of a silicon crystal. The upper cylinder is pushed downward in a path-controlled trajectory. On contact, the induced stresses on the upper and lower surface are discernible. Tensile stresse ...

Views: 1681

Tire traction

Discrete Element Method (DEM) simulations can be used to model the traction of a tire on a granular ground. The DEM force laws can be parameterized in order to represent various types of grounds ranging from sand over mud to snow. ...

Views: 874

Air polishing of a tooth

Co-Authors: T. Kraft
The movie shows a detailed three-dimensional surface model of a human tooth. The tooth is rotating around its central vertical axis. During the rotation, a stream of size-distributed particles with constant initial velocity hits t ...

Views: 879

Sweeping granular matter with a flexible lamella

Co-Authors: C. Dehning, T. Kraft
The movie shows lamellas of different flexibility which are used to sweep cohesive granular matter by a lateral movement. The effectivity of the sweeping depends strongly on the rigidity of the lamella. Cleaning processes are appl ...

Views: 819

Bulging and buckling of a hose under pressure

Co-Authors: C. Dehning, T. Kraft
The movie shows a fluid in a rigid pipe which is connected to a hose of rubber-like material. A piston moves downward through the pipe thereby pushing the fluid into the hose which is sealed by a disc at the lower end. The hose bu ...

Views: 892

Fluid flow from a hose under gravity

Co-Authors: C. Dehning, T. Kraft
The movie shows a fluid in a rigid pipe which is connected to a hose of rubber-like material. A piston moves towards the left through the pipe thereby pushing the fluid out of the hose. Gravity is accelerating the fluid downwards. ...

Views: 729