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Engineering Design Fundamentals and Single Flat Joint Characteristics 231

10

9
8 7
Mean interface pressure, ton/in 2 6 5 4 Equivalent solid G/L M/L Unloading

curve in

2 3 each case
M/G
M/M Scale-m in
1
0 200 400
Deflection normal to joint
(a)

10
9 8 G/G SC/SC Sh/Sh
Mean interface pressure, ton/in 2 7 6 5 4 Equivalent solid Loading Unloading

1 3 2
0
0 200 400 0 200 400 0 200 400 600 800
Deflection normal to joint, min
(b)
G: Ground L: Lapped M: Milled
SC: Scraped Sh: Shaped
Figure 6-10 Effects of surface finishes on joint deflection: (a) Mild steel joint and (b) cast
iron joint (by Thornley and coworkers).

Type of surface finish. Figure 6-10 shows the effects of the type of sur-
face finish on the joint deflection. It is obvious that the surface finish has
a considerable effect on the joint deflection during the first loading, but
no effect on those of unloading procedures at all.