PSI- Issue 9

Alexandre Chmel et al. / Procedia Structural Integrity 9 (2018) 3–8 Chmel et al. / Structural Integrity Procedia 00 (2018) 000–000

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was lesser than that of two other tested ceramics. This means that intergranular fracture in the former material produced a denser network of cracks but affected to a lesser extent the strong crystallite host. Nesheva et al. (2009) suggested that the phase state of the layers between crystallites might vary from amorphous to polycrystalline in dependence of relative size of crystallites and layers. A transition from the purely plastic yielding to cracking manifested itself also in the impact damaging experiments. The FL time series (Fig. 2) evidenced that the impact-induced failure in ZnS ceramics involves two stages. A primary response on the striker embedding into ceramics (~ 100 µs) was caused by the plastic deformation realized through the motion of dislocations producing the strong local electric fields, McCloy and Potter (2013) and Bredikhin and Shmurak (1979). The electron-hole recombination with light emission occurred from the moment of the contact between the loaded striker and sample. As the ultimate deformation achieved, a fault with propagating cracks nucleated. The intensive bond breakage at the latter stage caused a secondary FL excitation from the reconfigured electronic structure. 4. Conclusion The photoluminescence data evidenced that the particle damaging of ZnS–CVD ceramics, which was performed with the abrasive treatment, does not affect significantly crystallites because of plasticity of intercrystallite substance, in which the impact-induced tension dissipates. Undamaged crystallites retain their optical properties that is do not exhibit additional absorbance. The decrease of the transmissive capability under particle impacts occurs predominantly due to light scattering on the newly-formed surface irregularities. References Bredikhin, S.I., Shmurak, S.Z., 1979. 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