The fatigue properties of thermo-mechanically treated and machined aluminum alloy 7475-T7351 have been studied. The applied advanced machining strategy induced intensive plastic deformation on the machined surface under defined cutting conditions. Therefore, a detailed study of 3D surface topography was performed. Advanced characterization of the material structure and electron back scattered diffraction mapping of selected chemical phases were performed, as well as energy dispersive X-ray analysis of the surface. Advanced mechanical properties of the material were investigated in situ with a scanning electron microscope that was equipped with a unique tensile fixture. The fatigue results confirmed an evident dispersion of the data, but the mechanism of crack nucleation was established. Fracture surface analysis showed that the cracks nucleated at the brittle secondary particles dispersed in the material matrix. The surface topography of samples that had been machined in wide range of cutting/deformation conditions by milling has not proved to be a decisive factor in terms of the fatigue behavior. The incoherent interface and decohesion between the alumina matrix and the brittle secondary phases proved to significantly affect the ultimate strength of the material. Tool engagement also affected the fatigue resistance of the material.
Virtual reality is quickly evolving technology which is starting to push not only in entertainment but also in other disciplines like an automotive, machine or aircraft industry. Due to ever higher teaching demands of these problematics virtual reality is one of the ways how to increase teaching efficiency. This paper aims to create a virtual laboratory with an interactive model of a machine tool. Head-mounted display and controllers from Oculus were used for the visualization and interaction with the machine tool. The interactivity of model lies in the opportunity of assembling and disassembling basic parts of the machine tool to elementary construction parts. This enables to the interested person better and faster understanding of construction problematics of machine tools which contribute to the improvement of the teaching effectiveness.
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