MIL-STD-1660A APPENDIX E
E.1 SCOPE
PENDULUM-IMPACT TEST
E.1.1 Scope. The following procedure is applicable for determining the ability of unit loads to resist horizontal impacts and for determining the ability of the packaging and packing methods to provide protection to the contents when the unit load is impacted. This Appendix is a mandatory part of the standard. The information contained herein is intended for compliance.
E.2 APPARATUS
E.2.1 Pendulum-impact tester. A pendulum-impact tester which consists of a platform suspended from a height at least 16 feet above the floor by four or more ropes, chains, or cables; and a bumper consisting of a flat, rigid concrete, or masonry wall, or other equally unyielding flat barrier. The bumper shall be 18 inches high, wide
enough to make full contact with the end of the unit load, and shall have sufficient mass to resist the impacts without displacement. The impact surface shall be oriented perpendicular to the line of swing of the platform. The platform shall be large enough to support the unit load, and when hanging free, shall have its top surface approximately 9 inches above the floor, and its leading edge at least 3 inches from the surface of the bumper. The suspension chains shall be vertical and parallel so that when the platform is pulled straight back it will rise uniformly but remain at all times horizontal and parallel to the floor.
E.3 SPECIMEN
E.3.1 Contents. One unit load and its contents shall constitute a single specimen. The unit load shall be loaded for the test with the interior packing and the actual contents for which it was designed. If use of the actual contents
is not practical, a dummy load shall be substituted to simulate such contents in weight, shape, and position in the
container. The contents, or dummy load, shall be blocked, braced, and cushioned in place as for shipment. E.4 CONDITIONING OF SPECIMEN
E.4.1 Test specimen. Unless otherwise specified (see 6.2), no special conditioning of the test specimen shall be necessary.
E.5 PROCEDURE
The specimen shall be placed on the platform with the surface which is to be impacted projecting beyond the front end of the platform so that the specimen just touches the vertical surface of the bumper. The platform shall be pulled back so that the center of gravity of the pack is raised to the prescribed height, and then shall be released to swing freely so that the surface of the unit load impacts against the bumper (see figure E-1). When the test is conducted to determine satisfactory performance of a unit load and unless otherwise specified (see 6.2), each specimen shall be subjected to one impact to each side and each end that has a horizontal dimension of less than 9.5
feet. Unless otherwise specified (see 6.2), the vertical height of drop shall be 9 inches, which results in a velocity of
7 feet per second at impact. A record shall be made of any changes or breaks in the unit load, such as apparent racking, nail pull, or broken parts and their locations. The packing (blocks, braces, cushions, or other devices) and
the contents shall be examined carefully and a record made of their condition. E.6 NOTES
a. This test is meant to simulate severe railroad humping or other accidental handling impacts. It is intended
that the pendulum-impact test shall be used only on unit loads that are susceptible to accidental end impacts. The pendulum impact was designed specifically for large and/or heavy shipping containers or unit loads that are likely to be handled mechanically rather than manually. Details are given with the qualification, "unless otherwise
specified", in paragraphs regarding:
(1) Conditioning of specimens (see E.4). (2) Number and height of drops (see E.5).
b. When the pendulum-impact test is performed to evaluate the protection provided for the contents, the rigidity of a dummy load should closely approximate that of the actual contents for which the packaging within the unit load was designed.
Source: https://assist.dla.mil -- 3D1ownloaded: 2014-09-28T13:04Z Check the source to verify that this is the current version before use.
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