National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Mechanické vlastnosti vláknových uhlíkových kompozitů
Začal, Jaroslav
Carbon fibre reinforced composites (CFRP) are construction material, which is viewed as a perspective for its ratio of mechanical properties to weight. In recent years the research was focused on implementing the carbon-based composites among smart materials. Nevertheless, extent and volume of use of these composites in technical practice is still not up to the potential, which this modern material offers. One of substantial reasons is the lack of adequate instruments for continuous manufacturing quality control and for mechanical condition monitoring of ready-made construction parts. For this reason the presented dissertation thesis is focused on effectiveness enhancement of detection of deformation response in composites subjected to mechanical loading with uniaxial tension with employment of passive acoustic emission (AE) detection, optical method for detection of surface deformation fields digital image correlation (DIC) and electron microscopy scanning electron microscopy (SEM). Combination of used methods proved as a robust instrument for identification and monitoring of entire degradation process in composite material in course of mechanical loading.
Vývoj konstrukce školního nábytku pro rozvojové země
Začal, Jaroslav
Thesis is focused on design of production, material specifications and construction technology simplifications of school chairs and seats for developing countries. The use of locally available materials and equipment of local industry with application of low-technology manufacturing processes are emphasized. In developing areas this functional school furniture represents the basic comfort for pupils and facilitates the learning process. The thesis consists of three parts. The first part is focused on and deals with experimental assessment of mechanical parameters of various rectangular joint designs. In this case joints are stress-loaded in transversal direction. The second (practical part) of the thesis deals with designing the functional shape of seats with use of joints described and tested in the first part. The third part of thesis deals with manufacturing of designed chair model due to specifications mentioned in first part of thesis and also with design of simple tool for manufacturing the joints with low-end and low-cost technology. Further the thesis introduces my own design of simple seat construction made from massive wood material manufactured by low-end technology with regards to achieving the due specifications. The task of this thesis is to design the viable manufacturing process of seats and chairs from raw wood and scrap material. Essential part of thesis is also manufacturing of seat prototype and simplified model of proposed mortise and tenon drill. The thesis encloses the literature overview, experiment methodology, description of potentially usable and really used materials. In last chapter the testing results are summarized and the sample of manufacturing is documented.

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