Mini lecture: Theories, Experimental Investigations and Numerical Modeling Regarding Crack Growth (Dr. Britta Schramm, Paderborn)

Jan 15
15. Januar 2021 9:00 Uhr bis 16:30 Uhr

Mini Lecture on „Fracture Mechanics“ by Dr.-Ing. Britta Schramm:
Theories, experimental investigations and numerical modeling regarding crack growth

The propagation behaviour of fatigue cracks determines the service life of components and technical structures in many cases. In order to be able to carry out a service life prediction from the fracture mechanical point of view, the knowledge of the stresses within the component enables the determination of a physical value characterizing the stress situation at the crack tip (e.g. stress intensity factor). By comparing with fracture mechanical material parameters statements can be made regarding the growth ability and direction of crack growth as well as the remaining service life until breakage. Furthermore, inspection intervals can be defined.
The seminar focuses especially on the fracture mechanical characterization of metallic materials. Starting with the engineering fundamentals and different propagation concepts of linear-elastic fracture mechanics (LEBM) and elasto-plastic fracture mechanics (EPBM) the experimental determination of corresponding material parameters (such as threshold against fatigue crack propagation ΔKI,th, fracture toughness KI,tC) will be discussed. Furthermore, methods for the numerical simulation of crack growth propagation and further applications and challenges are considered.

Preliminary Agenda:
9:00 Greetings Introduction to cracks in components and technical structures
10:00 Fracture Mechanical Fundamentals (LEBM, EPBM)
11:30 Experimental determination of fracture mechanical material parameters
12:30 Lunch Break
13:30 Numerical Simulation of crack propagation in 2D- and 3D-structures
14:30 Further applications considering influences of material gradation, residual stresses and other challenges
Final Discussion
Expected end around 16:00 / 16:30