MIL-DTL-83140B
4.4.4 Breaking strength. A specimen shall be prepared from each sample of wire rope
selected. Swaged terminations conforming to MIL-DTL-781 (do not use ball end fittings) and
accompanying hardware may be used to facilitate installation of the specimen in the jaws of the
testing machine. The length of wire rope sample under load shall be not less than 10 inches.
Sample length shall be measured from the edge of jaw-style grips, the tangency point of wrap-
style grips, the end of the swaged shank of MIL-DTL-781 terminals or some similar position.
The breaking strength shall be determined by use of a tensile testing machine in accordance with
the applicable requirements of ASTM E8/E8M. The breaking strength shall conform to the
requirements of table I. In the case of failure due to an unsatisfactory end termination, the test
will be disregarded and a new test will be conducted (see 3.9).
4.4.5 Load testing. A specimen from each sample of wire rope selected shall be tested.
The length of wire rope sample under load shall be not less than 10 inches. Sample length shall
be measured from the edge of jaw-style grips, the tangency point of wrap-style grips, the end of
the swaged shank of MIL-DTL-781 terminals or some similar position. The specimen shall be
gradually loaded to the minimum breaking strength of the wire rope as specified in table I. The
load shall be applied for a minimum of five seconds. At the end of the test, the entire wire rope
shall be completely unwound and every wire inspected. The failure of any wire shall be cause
for rejection of the lot represented (see 3.8). A suitable electronic device capable of detecting the
breaking of individual wires during testing may be used instead of unwinding the wire rope (see
4.4.5.1).
4.4.5.1 Load testing (optional). The specimen shall be loaded to the minimum breaking
strength requirement of the wire rope. If no ping (see 6.4.4) is heard, the specimen has passed
the test. If one or more pings are heard, the wire rope specimen shall be considered to have
broken wires or shall be unraveled and any broken wires shall confirm failure of the specimen.
If no broken wires are found, the specimen shall be considered as having passed the test (see
3.8). Specimens with broken wires shall be cause for rejection of the lot represented.
4.4.6 Endurance testing. One endurance test specimen shall be prepared from each lot of
wire rope of the diameters shown in table II. The number of reversals per minute shall be 120
(see figure 3) and the tension loads shall be as indicated in table II for each size of wire rope. The
total travel of the wire rope in one direction shall be 13.5 inches as specified in figure 3. The test
pulleys shall be made of steel and shall conform to the dimensions shown on figure 4. The
application of lubricant to the endurance test samples in addition to the lubricant applied during
the manufacture of the wire rope shall not be permitted either before or during the endurance test
(see 3.10).
4.4.6.1 Endurance test break strength. Following the endurance test of 4.4.6, two
specimens corresponding to the length cycled over the small sheaves shall be tested in accordance
meet or exceed minimum breaking strength for the sample to pass the endurance test.
4.5 Certification. For each contract or order, the wire rope manufacturer shall certify
that the product satisfactorily passed the conformance inspections (see 4.3.1 and 4.3.3) of this
specification. The certification shall include, as a minimum, actual results of the tests specified
herein and shall be retained on file at the manufacturer's facility for a minimum of 7 years.
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