MIL-STD-2105D
28 MN/m2 (4061 psi). The combination of concrete and the steel plate must be constructed such that no free water is retained
on top of the steel plate. Any and all unwanted debris (e.g., snow, ice, leaves) shall be removed from the impact surface prior to testing. The steel plate shall be positioned to facilitate safe handling of dropped munitions.
The impact surface shall be flat and level, i.e., horizontal to within two degrees and not deformed from previous impacts to the point that it affects the impact angles or causes separation from the concrete support. The impact surface and recover area shall be positioned to facilitate safe handling of dropped munitions.
Drop test facilities commonly consist of a large concrete block, effectively 20 times the mass of the test item, faced with a smooth steel plate. Major repair, overhaul, or new construction of facilities must observe the above requirements.
5.1.4.4 Orientation and number of drops. A minimum of three separate drops at different impact orientations, as noted below, shall be conducted. Additional drops may be conducted, as determined by the Lifecycle Environmental Profile or leading Service's requirements. The actual sample size, i.e. number
of individual munition items subjected to test, is package
dependent (see figure 2). The test item is to be released (dropped) such that it will approximate, within two degrees off-axis, an initial impact in the following minimum orientations:
Major axis vertical, nose down ↓ Major axis vertical, base down ↑ Major axis horizontal, →
Drop tests should be carried out in order of decreasing likelihood of producing unwanted events. No test item shall be dropped more than once.
5.1.4.5 Conditioning and pre-stressing. For the purpose of this document, conditioning is defined as the steady state temperature an item achieves and maintains throughout the test procedure, typically -65°F (-54°C) and +160°F (+71°C).
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