The project combines advanced methods of experimental dynamics with state-of-the-art methods of fast time-lapse X-ray imaging, achieving unprecedented research capabilities for materials with complex structures during medium and high-speed deformation processes. The flash X-ray source and powerful X-ray tube, along with high-speed imaging equipment (high-speed camera and detectors), are used to study internal processes in materials during impact loading. A significant part of the project focuses on the research of advanced materials with deformation rate-sensitive fillers, with an emphasis on the analysis of fillers composed of non-Newtonian fluids and fluids with nanoparticle inclusions. In this area, the combination of X-ray imaging and instrumented dynamic experiments allows identifying key aspects of material deformation behavior and damage. The project outputs will be used to verify theoretical findings and models focusing on internal processes in materials that are not detectable by conventional methods.
Project Goal:
The aim of the project is to identify key aspects of the deformation behavior of complex materials during medium and high-speed impacts using a combination of innovative experimental methods in dynamics with state-of-the-art methods of fast time-lapse X-ray imaging.
Principal Investigator:
Ing. Tomáš Fíla, Ph.D.
Program:
GAČR (national project)
Project Duration:
2024 - 2027
Principal Investigator:
Ing. Petr Koudelka, Ph.D.
Program:
GAČR (national project)
Project Duration:
2024 - 2026
Annotation:
The project focuses on controlling the propagation of stress waves in additively manufactured metal components composed of at least two different metals with spatially shaped and multiple interfaces produced by the laser powder bed fusion method. This will allow controlling the internal arrangement and shaping of the interface between the two materials. Dynamic loading with different deformation rates using Hopkinson split bars will be used to describe the propagation of stress waves and the absorption of kinetic energy. At the same time, theoretical and numerical modeling of wave reflection/transmission at various geometrically arranged interfaces will be carried out.
Project Goal:
Develop innovative numerical tools for controlling wave processes for advanced multi-material optimization of embedded spatial structures. The obtained results will answer questions about whether it is possible to control the propagation of stress waves using multi-material 3D printing of metals, and which geometric and mechanical parameters have a significant impact on the attenuation and concentration of stress waves.
The primary priorities for nations within seismic belts include earthquake resilient structures, strengthening of vulnerable structures, and the restoration of heavily and moderately damaged constructions. On a global scale, the impact of seismic activity reaches beyond the borders of the affected nation, impacting the entire world. Therefore, the project deals with the implementation of shear thickening fluid (STF) as a vibration-damping system (VDS) as a novel approach for earthquake-resilient structures. STF recently peaked attention in literature for shock/impact absorbing properties. Employing STF as a VDS for low-frequency events (i.e., earthquakes) can upgrade the performance of the structures in certain cases.
Project Goal:
STF4SW aims to achieve:-synthesising of STF, specifically PolyBoronSiloxane (PBS) that will work under low shear rates, -material characterization tests on STF and the application of STF as a vibration damping system (VDS) for real-time applications.
Team Members:
prof. Ing. Ondřej Jiroušek, Ph.D. (řešitel)
Ing. Tomáš Doktor, Ph.D. ; Ing. Jan Falta ; Ing. Tomáš Fíla, Ph.D. (spoluřešitelé)
