The Delft Sand, Clay & Rock Cutting Model, 2019a

Rock Cutting Charts.
W.6 Brittle Tensile Failure based on Brittle Tensile Shear Angle.
90
B: Shear Angle β vs. Blade Angle α, Based on Tensile Failure
Shear Angle β (Degrees)
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Blade Angle α (Degrees)
φ=00°
φ=05°
φ=10°
φ=15°
φ=20°
φ=25°
φ=30°
φ=35°
φ=40°
φ=45°
© S.A.M.
Figure W-35: The shear angle β as a function of the blade angle α and
the internal friction angle φ for shear failure, corrected.
B: Brittle Tensile Hor. Force Coefficient λ HT vs. Blade Angle α
20
Brittle Tensile Horizontal Force Coefficient λ HT (-)
18
16
14
12
10
8
6
4
2
0
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Blade Angle α (Degrees)
φ=00°
φ=05°
φ=10°
φ=15°
φ=20°
φ=25°
φ=30°
φ=35°
φ=40°
φ=45°
© S.A.M.
Figure W-36: The brittle (tensile failure) horizontal force coefficient λHT, corrected.
Copyright © Dr.ir. S.A. Miedema TOC Page W-155 of 228