MIL-DTL-17191E(SH)
TABLE III. Axial dynamic stiffness requirements Continued.
Mount type
Axial load (lb)
Dynamic stiffness (lb/in)
15P1200A and 15P1200B
1200
19931 to 36483
15P2000A and 15P2000B
2000
33219 to 60805
3.4.3 Static strength. Mounts, when tested in accordance with 4.4.2.2, shall not show any appreciable
permanent deformation of metal parts or damage such as separation, tears, cracks, or breaks in or between
component parts.
3.4.4 Fatigue. Mounts, when tested in accordance with 4.4.2.3, shall not show evidence of failure of the
resilient element, bond, and metal parts.
3.4.5 Drift. The mounts shall not have a loss in height greater than 0.012 inch when tested in accordance with
3.4.6 Delamination and porosity. When tested in accordance with 4.4.2.5, the resilient element shall not show
evidence of porosity or separation into distinct layers or laminations.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 Qualification inspection. Qualification inspection shall be performed on finished mounts (see 4.2.2) and
their associated rubber compounds (see 4.2.1). Refer to 3.1 and 6.3. If the manufacturer is seeking qualification for
all mount types (see 1.2.1), then the four mount types specified in table VI shall be subjected to qualification
inspection. If the manufacturer is seeking qualification for one mount type, then only that mount type and
associated rubber compound shall be subjected to qualification inspection.
4.2.1 Qualification inspection of the rubber compounds. Specimens described in table IV shall be produced
from the four classes of rubber compounds which are mixed for the manufacture of mounts subjected to
qualification inspection. Refer to 4.2.2 for mount types subjected to qualification. The manufacturer shall certify
that the specimens are of the same material and equivalent cure (and bond) as the mounts to be tested for
qualification. These specimens shall be subjected to the tests specified in table V to determine compliance with
3.3.3.2. If all test specimens meet all requirements, then mounts shall be tested for qualification in accordance with
TABLE IV. Rubber specimens for qualification.
Quantity
Specimen description
Property to be measured
6
ASTM D412, Die C: from sheets 0.08±0.01 by 6 by 6 inches
Tensile strength and ultimate
elongation (initial and aged)
3
Rectangular: 0.08±0.01 by 1 by 2 inches
Resistance to oil
3
Cylinder: 0.125±0.005-inch thickness by 1.597±0.005-inch
Adhesion to metal
diameter bonded to metal plates
4
Cylinder: 0.49±0.02-inch thickness by 1.14±0.02-inch
Hardness and compression set
diameter
5
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