By United States. Naval Facilities Engineering Command
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I. Mott, A Theoretical Formula for the Distribution of Weights of Fragments, which gives a lower value for initial velocity than that predicted by Gurney's equation. Therefore, for design purposes it is conservative to base initial velocity calculations upon the Gurney equation. b. Variation of Fragment Velocity with Distance. The primary concern for design purposes is the velocity with which the fragment strikes the protective structure. At very short distances from the detonation (about 20 feet), the striking velocity can be assumed to be equal to the initial velocity.
M. Swisdak is reproduced here. A detailed description of the work is provided in the report titled Explosion Effects and Properties: Part 1, Explosion Effects in Air, NSWC/WOL TR-116. 08-34 b. Configuration of Charge and Interpretation of Different Parameters. Figure 18 shows the configuration of the charge and the interpretation of the different parameters required for the data presented in this section. 25 and 40. Because of the scatter in the experimental pressure data used to construct Figures 19 through 24 and the uncertainties involved in making the necessary extrapolations, the curves in this section should be considered accurate only to within +/-30 percent.
Primary Fragments. The topics listed above are dealt with in brief in this section. More detailed information is provided in the texts and documents referenced in this manual. Design examples are provided in paragraph 12 to help the user understand the procedures outlined in this section. b. Related Criteria. In blast resistant design, the principal effects of the explosive output to be considered are blast pressures and primary fragments. Usually, the blast pressures are the governing factor in the determination of the structure's response.