MIL-DTL-46177C(MR)
APPENDIX A
BALLISTIC TESTING OF STEEL PLATE AND SHEET, WROUGHT, HOMOGENEOUS
A.1
SCOPE
A.1.1 Scope. This appendix covers the requirements for ballistic testing of
wrought homogeneous steel plate and sheet from l/8 to less than l/4 inch
inclusive in thickness. When there is a mutual agreement between contractor and
procuring activity, this appendix becomes a mandatory part of this specification
and the information contained herein is intended for compliance.
A.2
APPLICABLE DOCUMENTS
A.2.1
Government documents.
A.2.1.1 Other Government documents, drawings, and publications. The following
other Government documents, drawings, and publications form a part of this
document to the extent specified herein. Unless otherwise specified, the issues
are those cited in the solicitation.
USATECOM TOP 2-2-7l0
Ballistic Tests of Armor Materials
ITOP 4-2-805
Projectile Velocity and Time of Flight Measurements
(Application for copies should be addressed to the Defense Technical Information
Center, 8725 John J. Kingman Road, Suite 0944, Fort Belvoir, VA 22060-6218.)
A.3
DEFINITIONS
A.3.1 Ballistic limit, protection criteria (V50BL(P)). The V50BL(P) may be
defined as the average of an equal number of highest partial penetration velocities
and the lowest complete penetration velocities which occur within a specified
velocity spread. The normal up-and-down firing procedure is used. A 0.020 in.
thick 2024 T3 sheet of aluminum is placed 6 ± 1/2 inch behind and parallel to the
target to witness complete penetrations. Normally, at least two partial and two
complete penetration velocities are used to complete the BL(P). Four, six, and
ten-round ballistic limits are frequently used. The maximum allowable velocity span
is dependent on the armor material and test conditions. Maximum velocity spans of
60, 90, 100 and 125 feet per second are frequently used.
A.3.2 Complete penetration, (CP). A complete penetration occurs when the
impacting projectile, or any fragment thereof, or any fragment of the test specimen
perforates the witness plate, resulting in a crack or hole which permits light
passage when a 60-watt, 110-volt bulb is placed proximate to the witness plate.
A.3.3 Fair impact. An impact should be considered fair when an unyawed fragment
simulator or test projectile strikes an unsupported area of the target material
at a specified obliquity at a distance of at least two projectile diameters from
any previous impact or disturbed area resulting from an impact, or from any
crack, or from any edge of the test specimen.
A.3.4 Partial penetration, (PP). Any impact which is not a complete penetration
should be considered a partial penetration.
15
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business