Peak Shear Strength and Shear Impulse
This study used the shear strength and shear impulse of
Napier grass stem as the evaluation indexes for Napier
grass stem in the cutting-off process. Figure 2 shows the
typical force-time curve in the impulse-cutting of stem. The
maximum shear force on the force-time curve is Fmax, and
the shear strength τm is defined as: