Rheology of composites research group
TalTech priority area
Research classification (Frascati)
Head of the research group
Research group member
Doctoral students
Keyword
mechanics of materials
fiber concrete
fiber orientations
computational rheology
image analysis
3D visualization
Overview
The competences of the group have a broadrange, from constitutive theory over numericalcomputer simulations and image analysis tovirtual reality visualization of scientific data.The main research topic is concerned with themechanical properties of composites containingshort fibres. The core application is steel fibrereinforced concrete, a construction material, theuse of which is gaining momentum in the building industry. The mechanical properties largelydepend on the orientation of short fibres, whichin turn are influenced by the production processof the structural parts made of fibre concrete. Inparticular, the flow of the fresh concrete mass,which is mixed with the fibres, determines thefibre orientations. Analysis of fibre orientationsin experiment samples is done by x-ray computed tomography, fibre orientations are thenextracted from the tomography. The group hasdeveloped its own software for this purpose. Theproduction process of concrete parts, in particular the casting, is simulated using computationalfluid dynamics (CFD) coupled to an orientationequation. Further, simulations of bending testsand split tests are performed with particle baseddiscrete element simulations. On the theoreticalside, the group has developed constitutive modelsfor the influence of the fibre orientations distribution on the mechanical and thermal propertiesof fibre concrete.This involves the research on stereoscopicsemi-immersive 3D visualization (virtual reality), which is conducted on the self-developed“Kyb3” system. The main task of the system isthe visualization of the computed tomography offibre concrete and CFD simulations. It is usedto visually inspect measurement and simulationresults.
Related projects
Related department
Teadusgrupiga seotud publikatsioonid
- Herrmann, H. A constitutive model for linear hyperelastic materials with orthotropic inclusions by use of quaternions // Continuum mechanics and thermodynamics (2021) vol. 33, 4, p. 1375-1384.
https://doi.org/10.1007/s00161-021-00979-4 - Kartofelev, D., Goidyk, O., Herrmann, H. A case study on the spatial variability of strength in a SFRSCC slab and its correlation with fibre orientation // Proceedings of the Estonian Academy of Sciences (2020) 4, p. 298-310 : ill.
https://doi.org/10.3176/proc.2020.4.03 - Lahe, A., Braunbruck, A., Klauson, A. Modified transfer matrix method for steady-state forced vibration : a system of bar elements // Proceedings of the Estonian Academy of Sciences (2020) vol. 69, 2, p. 143–161 : ill.
https://doi.org/10.3176/proc.2020.2.06 - Kartofelev, D., Arro, J.G., Välimäki, V. Insights into the string-barrier interaction dynamics based on high-speed camera measurements // SMC 2020 : Proceedings of the 17th Sound and Music Computing Conference, Torino, Italy, June 24th - 26th 2020. Torino : Sound and Music Computing Network, Xea sas/SMC Network, 2020. p. 169-176.
https://smc2020torino.it/adminupload/file/SMC2020Proceedings.pdf - Vilipuu, M., Kartofelev, D., Kalda, J. Use of simplified bowed string model in physics education : a laboratory experiment // Proceedings of Meetings on Acoustics (2022) vol. 48, 1, art. 025001.
https://doi.org/10.1121/2.0001628 - Kartofelev, D., Arro, J. G., Valimäki, V. Experimental verification of dispersive wave propagation on guitar strings // SMC 2019 : Proceedings of the 16th Sound & Music Computing Conference. Malaga : SMC, 2019. p. 324–331 : ill.
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084386995&partnerID=40&md5=b18526954c2e08531266a8f19f44811e http://smc2019.uma.es/docs/SMC2019_Proceedings.pdf - Goidyk, O., Herrmann, H. Initial results of local strength analysis of a fiber concrete plate by 4-point bending tests // 13th International Conference : Modern Building Materials, Structures and Techniques, May 16–17, 2019, Lithuania. Vilnius : VGTU Press, 2019. p. 306-310 : ill.
https://doi.org/10.3846/mbmst.2019.116 - Lahe, A., Braunbrück, A., Klauson, A. An exact solution of truss vibration problems // Proceedings of the Estonian Academy of Sciences (2019) vol. 68, 3, p. 244–263 : ill.
https://doi.org/10.3176/proc.2019.3.04 - Herrmann, H., Boris, R., Goidyk, O., Braunbrück, A. Variation of bending strength of fiber reinforced concrete beams due to fiber distribution and orientation and analysis of microstructure // IOP conference series : materials science and engineering (2019) vol. 660, art. 012059, 11 p. : ill.
https://doi.org/10.1088/1757-899X/660/1/012059 - Herrmann, H., Beddig, M. Tensor series expansion of a spherical function for the use in constitutive theory of materials containing orientable particles // Proceedings of the Estonian Academy of Sciences (2018) vol. 67, 1, p. 73-92 : ill.
https://doi.org/10.3176/proc.2018.1.04 http://www.ester.ee/record=b2355998*est - Herrmann, H., Goidyk, O., Braunbrück, A. Influence of the flow of self-compacting steel fiber reinforced concrete on the fiber orientations, a report on work in progress // Short fibre reinforced cementitious composites and ceramics. Cham, Switzerland : Springer Nature Switzerland AG, 2019. p. 97-110. (Advanced structured materials ; 95).
https://doi.org/10.1007/978-3-030-00868-0_7 - Herrmann, H., Braunbrück, A., Tuisk, T., Goidyk, O., Naar, H. An Initial report on the effect of the fiber orientation on the fracture behavior of steel fiber reinforced self-compacting concrete // Short fibre reinforced cementitious composites and ceramics. Cham, Switzerland : Springer Nature Switzerland AG, 2019. p. 33-50. (Advanced structured materials ; 95).
https://doi.org/10.1007/978-3-030-00868-0_3 - Herrmann, H., Goidyk, O., Naar, H., Tuisk, T., Braunbrück, A. The influence of fibre orientation in self-compacting concrete on 4-point bending strength // Proceedings of the Estonian Academy of Sciences (2019) vol. 68, 3, p. 337-346 : ill.
http://www.kirj.ee/32397/?tpl=1061&c_tpl=1064 https://doi.org/10.3176/proc.2019.3.12