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The work principles, failure modes, material selection, heat treatment process of rotary forging dies are researched in this paper. When working, the dies not only bears great pressure and long time high temperature, but also bears alternating stress caused by repeated heating and cooling which can easily lead to heat fatigue crack. Selecting proper die material and using appropriate heat treatment...
The NHMFL presently has three series-connected-hybrid (SCH) projects, two of which are entering a construction phase. The design of the SCH outsert magnets is based on a CICC configuration using cable of multi-filamentary Nb3Sn and Cu strands inside a stainless steel jacket cooled by forced flow supercritical helium at 4.5 K. The outsert coil design is presented along with the design criteria for...
The model of growth of a fatigue crack in conditions of dynamic compression has been developed. Features of fatigue cracks nucleation and development in steels with various structure have been revealed. It has been found out that preferable directions of crack development are the grain borders or boundary surface between structural components. Nonmetallic inclusions are places of primary microcrack...
Free oscillation technique (FOT) is widely used for research and diagnostics of fatigue cracks in metal parts, for revealing former in bolted and rivet joints etc. The main criteria for mechanical state evaluation using FOT is shift of natural frequency maxima in Fourier spectrum toward lower frequencies with increasing size of discontinuity. In this work with use of designed software for wavelet-analysis...
Free oscillation technique (FOT) is widely used for research and diagnostics of fatigue cracks in metal parts, for revealing former in bolted and rivet joints etc. The main criteria for mechanical state evaluation using FOT is shift of natural frequency maxima in Fourier spectrum toward lower frequencies with increasing size of discontinuity. In this work with use of designed software for wavelet-analysis...
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