RockTalk: Latest Research & Challenges in GeosciencesCopyright: © L. Greiner
What is the current state of research in the geosciences? What topics and issues are researchers working on? What influence do digitalisation and climate change have on the geosciences?
The Division of Geosciences and Geography proudly presents the lecture series RockTalk: Latest Research & Challenges in Geosciences. The lecture series will present current research results and the latest challenges in the geosciences. The lectures are aimed at all interested parties.
Do you have a topic suggestion or are you particularly interested in a geoscientific topic? Then contact us! We look forward to your suggested topics!
A new approach to solid mechanics based on thermodynamics
The previous solid mechanics is based on concepts of the 18th century. In the period of 1840-1870 there were tremendous developments in both physics and mathematics that are not possible without a modern, energetic understanding of deformation as a three-dimensional physical process. They are part of every engineering course. These concepts are still missing in continuum mechanics. It will be shown that the core concepts of the previous theory, stress and strain, are meaningless from a modern point of view, and that the previous continuum mechanics has no valid working term. Elastic deformation is inherently a change of state in the sense of the first law of thermodynamics. Conventional thermodynamics is written in scalars (P, V, T) and is therefore implicitly isotropic. The new approach builds on potential theory; it is thermodynamic theory in vector field form (f, r, T). This allows anisotropic boundary conditions to be modeled. A new thermodynamic state variable was discovered that occurs only under anisotropic loading. In addition, a kinematic bifurcation was discovered in the transition from elastic-reversible to irreversible material behavior. Together they explain a large number of previously puzzling observations in all types of material behavior (elastic, plastic, viscous, fracture). The calculated eigendirections especially for "simple shear" are fully confirmed by observations. The new approach explains a large number of observations such as conjugate fracture shears in gneisses, S-C microstructure and tongue folds in plastic shear zones, and turbulence in viscous flow.
- Referent: Dr. Falk Koenemann
- Date: Thursday, 12.10.2023, 18:30
- Place: LIH 504, Lochnerstraße 4-20
- Language: german
|1953||born in Heidelberg|
|1975-1980||Study of geology in Göttingen, diploma|
|1980.1986||Studies in USA, materials science and mathematics|
|1987-1990||Employment in the industry|
We look forward to your participation!
|06.07.2023||Prof. Dr. Florian Wagner||More than colorful images: Subsurface structures, properties and processes from multi-method geophysics|
|15.06.2023||Prof. Dr. Georg Strauch||115 years of sediment accumulation in the Eifel Mountains|
|Dr. Juliana Troch||How to build a supervolcano: The role of fluids in large silicic magma reservoirs|
|03.11.2022||Jun.-Prof. Dr. Nicole Richter||
The efforts to investigate the highly active but remote volcanoes of the South Sandwich Islands
|18.05.2022||Prof. Dr. Mirijam Zobel||Modern Crystallography - interfaces, disorder and material properties|
|28.04.2022||Prof. Dr. Rolf Bracke||The Geothermal Roadmap for Germany|