Kontakt

Dr.-Ing.
Rostislav Chudoba
Mies-van-der-Rohe-Str. 1
Raum 610
52074 Aachen

Tel.: +49 (0)241 80-28150
rostislav.chudoba@rwth-aachen.de

Termine

Mi. 16:30 - 18:00 Uhr
S12 (1385|212)

Mi. 15:15 - 16:00 Uhr
S12 (1385|212)

Beginn: 02.04.2019

Scope

Brittle-Matrix Composites denote wide range of composite materials combining cementitous matrices with tensile reinforcement materials (e.g. steel, carbon, glass, basalt) in various geometrical layouts including  (bars, mats, fabrics or randomly distributed, short fibers). Elementary phenomenon governing the behavior of this class of composites is the interplay of matrix cracking and debonding. Experimental and numerical methods will be used to illuminate the effect of cracking and debonding on the macroscopically observable material behavior.

The gained insight into the correspondence between the material design and the corresponding material- and structural behavior will facilitate the orientation in the rapidly growing field of novel cementitious composites. At the same time, commonalities and differences with respect to the traditional steel-reinforced concrete will be explained using the presented methods. A survey and classification of existing modeling approaches will be provided including the presentation of their limitations and possiblities of their improvement. Students will learn how to find solution strategies spaning the tasks of structural design, safety assessment, numerical analysis and experimental material characterization.

Particularly addressed questions will include

General
  • Classification of structural concrete components based on their composition - matrix / reinforcement (bar, grid, random short fibers)
  • Modeling strategies for the development of brittle-matrix composites (BMC)
Elementary damage and load bearing mechanisms
  • Matrix cracking: experimental observations, stable and unstable crack propagation, numerical and analytical modeling approaches
  • Bond between reinforcement and concrete matrix,experimental and modeling approaches
  • Tensile behavior: strain hardening, sources of ductility,experimental characterization, modeling approaches
  • Bending behavior: tension and compression and bending,construction of failure envelopes for general BMC cross sectional layouts
  • Shear loading: experimental / simplified engineering and numerical approaches,smeared versus discrete crack approaches
Prediction of structural behavior
  • Automated design assessment of structural concrete. Design safety
  • Sources of structural ductility / load bearing reserves / structural redundancy
  • Thin walled shells: interaction of material- and geometrical non-linearity and stability