Equivalent Bending Moment For Fluctuating Load is the torsional moment which, if acting alone in the fluctuating load manner, would produce in a circular shaft the shear stress. And is denoted by Mf. Equivalent Bending Moment For Fluctuating Load is usually measured using the Newton Millimeter for Torque. Note that the value of Equivalent Bending Moment For Fluctuating Load is always positive.