Uji Machine

Figure 2-26. Energies Affecting Motion of Bolt During Action of Accelerating Lever.

Figure 2-26. Energies Affecting Motion of Bolt During Action of Accelerating Lever.

Fig. 2-26 shows the curve obtained by using this relationship to determine the decrease in the kinetic energy of the barrel. This curve does not represent the energy transferred to the bolt because the remaining blowback action and the incidental losses still must be considered. The effects of the blow-back action and of the incidental losses can not be determined precisely at this time because the bolt motion has not yet been determined. However, both effects are not. very great and can be estimated with a sufficient degree of accuracy to insure small error in the computations. In an actual design problem, the result obtained by using these estimates could be considered to be a first approximation which can be refined if necessary. It was previously estimated that the effect of blowback up to 0.00826 second (when the residual pressure becomes zero) would perform a total work of 11 foot pounds on the bolt. Fig. 2-26 shows how this energy is assumed to be added to the kinetic energy obtained from the barrel. The incidental losses, which have been estimated as 50 foot pounds, are

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