Figure 11
(a) The erosion rate of the groove samples with different shapes [61]; (b) The erosion rate of the pit samples with different arrangements [97]; (c) The erosion rate of the samples with composite structures, C stands for curve, G stands for groove, and B stands for bump [66]; (d) The erosion rate of the samples with composite structures, F stands for flat, G stands for groove, and B stands for bump [66]; (e) The erosion rate of the samples with composite structures, V stands for groove, C stands for convex hull (bump), H stands for hexagonal pit, S stands for smooth, and 500 stands for the size of a pit [19]; (f) The erosion rate of the groove samples and smooth samples at different impact angles [63]