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- W2014774520 abstract "A new high quality turbine system using monolithic silicon-nitride ceramic is under development. In this study particle impact tests of the silicon-nitride have been tried at room and elevated temperatures with and without tensile load, which simulates centrifugal force of blade rotation. In the experiment 1 mm diameter particle is impacted at velocities up to 900 m s−1. In this paper, critical velocities for bending fracture and Hertzian cracks are examined. Moreover, strength degradation at elevated temperature and spall fracture of the blade are discussed. The main results are: 1) The bending fracture mode critical impact velocity for soft particles is higher than that for hard particles. 2)The impact parameter ϕ for initiation of Hertzian cracks ranges 1.08×10−5 – 1.56×10−5 for the materials tested. 3)Strength degradation at elevated temperature was clearly observed. 4) In the impact tests on blades spall fracture, which was caused by interaction of stress waves, appeared." @default.
- W2014774520 created "2016-06-24" @default.
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- W2014774520 date "1998-06-02" @default.
- W2014774520 modified "2023-09-23" @default.
- W2014774520 title "Experiment on Foreign Object Damage of Gas Turbine-Grade Silicon Nitride Ceramic" @default.
- W2014774520 doi "https://doi.org/10.1115/98-gt-399" @default.
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