MIL-DTL-17191E(SH)
4.4.2.3 Fatigue test. The test apparatus shall be capable of imparting constant sinusoidal deflection to the
mount. A suitable vibration shaker with accompanying frame or Universal Testing Machine shall be used for
conducting this test. The mount shall be secured to the mounting bracket of the machine and subjected to
400,000 cycles of 3/16-inch deflections measured from a neutral unloaded position. The ±3/16-inch cycling shall be in
the axial direction at the rate of 175 cycles per minute.
4.4.2.4 Drift test. The mount shall be loaded for 96 hours with weight equal to the mount upper load rating.
The loss of height in the resilient element measured 1 hour after application of load and again at the end of the
period shall be measured with a gauge having 0.001-inch sensitivity. The difference in the two readings shall
determine compliance with 3.4.5. Tests shall be conducted at room temperature of 80±5 °F. Refer to figure 4 for a
diagram of a typical drift test setup.
GAUGE
MOUNT
FRAME
WEIGHT
FIGURE 4. Drift test arrangement.
4.4.2.5 Delamination and porosity test. A mount shall be cut into two parts and examined for porosity. The cut
parts shall be immersed in Toluene (ACS reagent grade, ≥99.5 percent) for 24±¼ hours at a temperature of 80±5 °F.
After removal from Toluene, the sections of the mount shall be examined to determine evidence of separation into
distinct layers or laminations.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point s packaging activities within the Military Service or
Defense Agency, or within the military service s system commands. Packaging data retrieval is available from the
managing Military Department s or Defense Agency s automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The mount types covered in this specification are intended to isolate shock and vibration on
surface ships and submarines.
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