No. 99MBB122A
18-36
18.5.28 Rvk (JIS2001, ISO1997, VDA, Free): Valley depth
From the lines that are obtained by selecting 2 points (point A and point B) on the BAC
(material-ratio profile) that differ in mr value by 40%, obtain the line with the smallest
inclination. Set point C and point D to be the points where the obtained line intersects the
lines at mr = 0 and mr = 100. Set point E to the point on the BAC with the same slice level
as point D, and then set point F to the point were the BAC and the slice level at mr = 100
intersect. Next, set point G along mr = 100, so that the area enclosed by line segment DE,
line segment DF, and curve EF and the area of triangle DEG are the same. Rvk is the
distance between point D and point G. (Valley depth)
Rvk
D
G
H
C
A
B
E
A2
A1
Rk
Rvk
Mr1 Mr2
40%
J
F
Rpk
I
mr[c] (%)
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