Discrepancies Associated With The Drag Characteristics Of Primary Fragments
Abstract
In the calculation of the velocity of primary fragments a number of important parameters are involved. Some of these parameters are standard and seemingly well-defined [1-14]. Included in this group would be the drag coefficient, C(sub 0), the fragment density, rho(sub f), the ambient air density, rho(sub air), the fragment diameter, d(sub f), and the fragment mass, m(sub f). In addition to these standard parameters there exist a number of other parameters, which are not completely standard and/or not well-defined. The most important of these is the velocity decay coefficient, k(sub v) [1, 2, 4, 8, 13, 14]*. In three of these references [1, 2, 13] the parameter "caliber density," D, is also introduced. Another parameter is the "presented area," A(sub f) [1-14], along with the "shape factor or ballistic density," k [3, 4, 8], and the "L" parameter [3, 4]. In addition, the fragment "form factor" is utilized in a number of references [2, 10-13]. In a recent study [5], a methodology taken from Reference 4 introduces an "L(sub 1)" parameter, along with a specific value of the shape factor, k. In the development and application of these parameters, both standard and nonstandard, certain apparent discrepancies have developed. The discussion which follows represents a summary of these discrepancies. A complete description of all such parameters and related discrepancies is beyond the scope of this discussion, but such a description is available elsewhere [15].
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2010
- Accession Number
- ADA532300
Entities
People
- Frank B. Tatom
- Michael Swisdak