Abstract
The paper shows that when forces are applied to a mass which is connected to another mass by a stressed member, the “stressing forces” (i.e. the forces which must be considered when stressing the connecting member) are not the applied forces, but are fluctuating forces comprising the applied forces modified by vibratory forces at the natural frequency of the system.
The relative intensity of these vibratory forces depends upon the rate of application of the applied forces, and the period for which they are sustained, compared with the natural periodic times of the system to which the forces are applied.
Formulae are given for assessing the “stressing” forces under different conditions of application of the applied forces, and a graphical method of obtaining “stressing” force curves corresponding to applied force curves is described.
The application of the theory to some of the forces occurring in internal combustion engines is illustrated by a series of curves.
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