The experiments of Hatamura & Chijiiwa (1977B) were carried out with a blade length L4=0.2 m, a blade width w=0.33 m, an angle of internal friction φ=38°, an angle of internal friction δ=2/3·φ, an angle of internal friction on the pseudo blade of λ=32°, a dry density of ρs=1.46 ton/m3 and a cutting velocity of vc=0.05 m/sec.
Although the number of experiments of Hatamura & Chijiiwa (1977B) is limited, both the shear angles and the total cutting forces tend to follow the wedge theory for blade angles of 75° and 90°. The direction of the total cutting force measured is more upwards directed (negative angle) than predicted with the wedge theory for the 90° blade. This could mean that the real mechanism is different from the wedge mechanism. The cutting forces however match well.