Abstract
This work aims to fully understand mechanisms of damage and fracture modes generated in a nitrogen carbide plate subjected to repeated particle impact. In the experiment, a nitrogen carbide plate, 30×30×5 mm^3, is subjected to repeated impact by glass, steel and alumina balls, and then, the impact number to fracture of the plate and a strain-time history at the center of the back surface are measured. In the glass ball impact, corn crack is initiated, but not in the steel ball impact. SEM observation on the impact surface shows that indentation due to plastic deformation is formed and inside the indentation, a ring crack is initiated. In addition, observation through an ultrasonic microscope reveals that a corn crack is initiated in one side after one shot of a ceramic ball and then after the five shots, a corn crack is initiated in both the sides.
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