On-the-fly fast X-ray tomography inspection of the quasi-brittle three point bending test

0465016 - ÚTAM 2017 RIV FR eng A - Abstrakt
Kumpová, Ivana - Vopálenský, Michal - Fíla, Tomáš - Kytýř, Daniel - Vavřík, Daniel - Pichotka, Martin - Jakůbek, Jan - Veselý, V.
On-the-fly fast X-ray tomography inspection of the quasi-brittle three point bending test.
IEEE Nuclear Science Symposium and Medical Imaging Conference. Strasbourg: IEEE, 2016.
[2016 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC. 29.10.2016-05.11.2016, Strasbourg]
Grant CEP: GA ČR(CZ) GA15-07210S
Institucionální podpora: RVO:68378297
Klíčová slova: on-the-fly fast X-ray tomography * time-lapse radiography * photon counting detector * fracture process zone
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

Measurement and visualization of the fracture process zone (FPZ) in silicate composites is essential for understanding how crack is formed and how it is propagating through the material. Although there have been already realized several time-lapse radiography and tomography experiments during the three point bending of silicate composites with conventional imaging techniques in the past, crack initiation and propagation is so fast that it is very difficult to capture sufficient spatial information in the exact moment when this process is occurring. Nowadays, progress in X-ray imaging instrumentation, especially single photon counting CdTe Timepix detectors with a fast parallel readout, allows to highly speed up the acquisition of the tomographic data while keeping the intrinsic resolution of tens of micrometres and high efficiency even for higher energies. Not surprisingly, also the time lapse tomography is moving towards this direction with the expectation of better results in shorter time. Tomography of relatively fast processes is becoming realistic even in laboratory conditions using commercially available micro-focus X-ray tubes. As an example of such a fast tomography, results of on-the-fly series of tomographic experiments performed on the specimen subjected to continual three point bending test allowing monitoring of the three dimensional spatial distribution of a crack initiation and propagation and evaluation of FPZ models is presented.
Trvalý link: http://hdl.handle.net/11104/0265103