Wear Performance of Bionic Dimpled-Shape Pistons of Mud Pump

Figure 4

Surface wear patterns of pistons with different dimple diameters in the service life test: (a) L-Standard piston, (b) L-D1 piston, (c) L-D2 piston, and (d) L-D3 piston. (a′, b′, c′, d′) are partial enlarged pictures of (a, b, c, d).

(a)

(a′)

(b)

(b′)

(c)

(c′)

(d)

(d′)