Národní úložiště šedé literatury Nalezeno 4 záznamů.  Hledání trvalo 0.01 vteřin. 
Deformation characteristics of chopped fibre composites subjected to quasi-static tensile loading
Šleichrt, J. ; Adorna, M. ; Neühauserová, M. ; Fenclová, N. ; Petráňová, Veronika
This work presents deformation behaviour of cost effective chopped fiber composites. Use of chopped fibre is advantageous for manufacturing however complex shape parts production technology could be challenging. Batches of samples with different fibres composition were subjected to uni-axial tensile loading to obtain overall materials properties and inspection of proper manufacturing based on local deformation inhomogeneities. Both crossbeam displacement and optical strain measurement were used for elastic characteristics evaluation. Deformation response was derived from full-field optical strain measurements based on digital image correlation method. Relatively large variation of mechanical properties testing of samples was found.
Identification of damaged zones in C/PPS specimens subjected to fatigue loading based on high-resolution thermography
Koudelka_ml., P. ; Kytýř, Daniel ; Fenclová, Nela ; Šperl, Martin
In this study high resolution thermography is used for identification of damaged zones in Carbon fiber/polyphenylene sulfide (C/PPS) long fiber composite specimens with induced impact damage subjected to tensile fatigue loading. Image processing techniques were applied on thermographs from all loading cases to obtain segmented images of the damaged location that were then used for\ncalculation of the heated area. Results show that the considered method can be used to identify heated area in the vicinity of damage with high confidence at low number of cycles where no significant fatigue effect is present in the material.
Experimentální stanovení creepových vlastností a chování při uniaxiálním namáhání materiálu C/PPS vyrobeného z pelet
Kytýř, Daniel ; Fíla, Tomáš ; Šleichrt, Jan ; Fenclová, Nela
Primárním úkolem zprávy je popis creepového chování sady vzorků vyrobených z peletek po inovaci výrobní technologie. Pro měření deformací byla použita primárně bezkontaktní optická metoda doplněna lokální tenzometrií. Pro popis creepového chování vzorků byl použit Findleyho model.
Hardness distribution mapping in low carbon pipeline steel using semiautomatic evaluation of Vickers indentation measurement
Doktor, T. ; Fenclová, N. ; Kytýř, Daniel ; Valach, Jaroslav
This paper deals with evaluation of hardness fields using Vickers indentation device and a semi-automatic software tool for local hardness distribution mapping. Spec- imens from low carbon pipeline steels were investigated. Dense grids of Vickers imprints were created on the specimens’ surface. Image data of the surface were acquired by a high resolution flatbed scanner with resolution 6400 dpi. The imprints were measured using an custom-developed image processing tool, and from the obtained geometrical characteristics local hardness values were derived. From the local hardness values and their coordinates the hardness field in the whole specimen was interpolated.

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