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11.5: Experiments of Hatamura and Chijiiwa (1977B)

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    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.

    Screen Shot 2020-08-24 at 6.29.57 PM.png
    Figure 11-11: The shear angle of Hatamura & Chijiiwa (1977B) versus the calculated shear angles, with and without wedge.
    Screen Shot 2020-08-24 at 6.30.44 PM.png
    Figure 11-12: The shear angle, wedge angle and mobilized external friction angle calculated with wedge.

    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.

    Screen Shot 2020-08-24 at 6.31.45 PM.png
    Figure 11-13: The total force of Hatamura & Chijiiwa (1977B) versus the calculated total force, with and without wedge.
    Screen Shot 2020-08-24 at 6.34.26 PM.png
    Figure 11-14: The direction of the cutting force of Hatamura & Chijiiwa (1977B) versus the calculated force direction, with and without wedge.

    This page titled 11.5: Experiments of Hatamura and Chijiiwa (1977B) is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Sape A. Miedema (TU Delft Open Textbooks) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.