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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Time lapse tomography of fracture progress in silicate-based composite subjected to the loading a combination with acoustic emission scanning
 Kumpová, Ivana ; Kytýř, Daniel ; Fíla, Tomáš ; Veselý, V. ; Trčka, T. ; Vopálenský, Michal ; Vavřík, Daniel
The initiation and propagation of a fracture in quasi-brittle materials (such as silicatebased composite) is an increasingly discussed topic for which various methods of research have been developed/applied. As the quasi-brittle silicate-based composite compounds are very non-homogenous, the mechanism of the crack initiation and propagation can be very different even for samples with the\nidentical geometry. One possible approach to study the fracture mechanism in quasi-brittle materials is to use several different experimental techniques in a single experiment and perform detail analysis to identify generally valid fracture process phenomena. In this work, a simultaneous monitoring of fracture\nprocess zone formation and propagation by three different methods is presented and discussed. A three point bending test was performed on a notched silicate composite specimen. During the loading process, a highly accurate force displacement dependence was recorded accompanied with X-ray radiography,\nX-ray computed tomogra-phy and acoustic emission scanning.
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Mikro radiografické měření rozvoje materiálového poškození
 Vavřík, Daniel ; Jakůbek, J.
Studies concerning the functionality and integrity of the loaded materials require information about crack tip evolution. The X-ray Dynamic Defectoscopy (XRDD) has spatial resolution of the micrometric scale thanks to usage of microspot X-ray source, high resolution detector system and advanced processing of radiographic data.
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