SPP 2020 - Teilprojekt: Hochauflösende elektronenmikroskopische Untersuchungen zum Ermüdungsverhalten von Hochleistungsbetonen und mehrskalige Modelierung mittels Bonded Particle Model


Project Title
Subproject of SPP 2020: High resolution electron microscopy of fatigue behavior in high performance concrete and multiscale modelling using a bonded particle model
 
Funding Code
SCHM 1473/29-1
 
 
 
 
 
Status
Laufend
 
Duration
01-08-2017
-
31-10-2021
 
GEPRIS-ID
 
 
Project Abstract
The project focuses on two topics: firstly, the examination of structural damage caused by fatigue in cementitious high performance materials using high resolution analytical electron microscopy. The correlation with the inhomogeneities within the material, for example the residues of the plasticizers in the hydrated material, is of special interest. It is our working hypothesis, that in high performance concretes without capillary porosity, the initiation of cracks is caused by such inhomogeneities, whereas in normal strength concrete the initiation of cracks is linked to capillary porosity and the pores within the transition zone. Secondly, the aim of the project is the multiscale modelling of fatigue in high performance concrete using a bonded particle model (BPM). The project concentrates on concrete without capillary pores. The analysis of the structural damage requires very small specimens Tension tests on such small specimens will be performed in a transmission electron microscope. The results of these mechanical tests will be linked to the spatial distribution of the phases within the concrete. The examination of the crack propagation is performed on macroscopic specimens damaged by fatigue. Parts of these specimens will be analyzed by FIB-tomography. This method allows a three-dimensional reconstruction of the structure with very high resolution. Therefore, a large portion of the scientific work will be the development of methods for analyzing concrete with high resolution electron microscopy. These methods will then be made available for the whole DFG priority program. In addition, these examinations will produce fundamental results with regard to structural damage, crack formation and crack propagation in the case of fatigue, for the own modelling as well as for the modelling work of other projects within the DFG priority program.The numerical research work is focused on the development of a multiscale BPM-based simulation approach and on the validation of meso- and macro-scale models for the description of fatigue behavior. The new approach should be able to predict the influence of cyclic loading on mechanical properties; consider the influence of mesoscopic concrete structure on macroscopic behavior; describe initiation and coalescence of micro- and growth of macro cracks, which lead to material destruction.The modeling of investigated samples will be performed with the self-developed simulation framework MUSEN, which will be extended with new calculation algorithms and rheological models. The validation of the simulation results and the estimation of the model parameters will be made based on data experimentally obtained for high-performance concrete and its components. Thereby, information not only about macroscopic material behavior will be used, but also data obtained from electron microscopy will be applied to create, adjust and validate the models.
 

Publications
(All)

Results 1-8 of 8

Issue DateTitleTypeAuthor(s)
12020Fatigue of concrete examined on the nanoscaleChapter/Article (Proceedings)Schaan, Gunnar ; Rybczynski, Sebastian ; Schmidt-Döhl, Frank Michael  ; Ritter, Martin  
22020Fulltext availableOpen AccessNumerical study on the mechanical behavior of ultrahigh performance concrete using a three-phase discrete element modelArticleRybczynski, Sebastian ; Dosta, Maksym ; Schaan, Gunnar ; Ritter, Martin  ; Schmidt-Döhl, Frank Michael  
32019Experimental and numerical investigations of the fatigue behavior of ultra-high performance concreteChapter/Article (Proceedings)Rybczynski, Sebastian ; Schaan, Gunnar ; Dosta, Maksym ; Ritter, Martin  ; Schmidt-Döhl, Frank Michael  
42019DEM calibration for modelling of the fatigue behavior of ultra-high-performance concreteChapter/Article (Proceedings)Rybczynski, Sebastian ; Dosta, Maksym ; Schmidt-Döhl, Frank Michael  
52019Transmission electron microscopy investigations of fatigue induced changes in the cement structure of ultra-high performance concreteChapter/Article (Proceedings)Schaan, Gunnar ; Rybczynski, Sebastian ; Ritter, Martin  ; Schmidt-Döhl, Frank Michael  
62019Transmission electron microscopy investigations of fatigue-induced changes in the cement binder structure of ultra-high performance concreteChapter/Article (Proceedings)Schaan, Gunnar ; Rybczynski, Sebastian ; Ritter, Martin  ; Schmidt-Döhl, Frank Michael  
72019Dem simulation and electron microscopy analysis of the fatigue behavior of ultra-high performance concreteChapter/Article (Proceedings)Schmidt-Döhl, Frank Michael  ; Rybczynski, Sebastian ; Dosta, Maksym ; Schaan, Gunnar ; Ritter, Martin  
82018Crack formation in Ultra High Performance Concrete investigated by electron microscopyConference ProceedingsSchaan, Gunnar ; Ritter, Martin  ; Schmidt-Döhl, Frank Michael