MIL-PRF-20092M
FIGURE 1. Specimen positioned in test apparatus for fatigue test.
4.5.10.3 Procedure. The specimen shall be folded crosswise and inserted between the two compression
plates; skin side out, if there is more skin on one side. The opening between the compression plates shall be
adjusted to two times the thickness of the unfolded specimen. The specimen shall be examined visually without
magnification for cracks in the outer folded edge. The assembly shall be aged for 22 + 1/4 hours at 158 + 2°F.
After aging, the specimen shall again be examined visually for cracks.
4.5.11 Tensile strength and ultimate elongation. Three test specimens, 1 inch by 6 inches by 1/2 inch
(plus or minus 0.0625) shall be cut from the top portion of the material. The length of the test specimens shall be
parallel to the length of the material and the cut edges shall be perpendicular to the top surface and free of ragged
edges. The specimens shall contain no scrim reinforced laminae. If the item to be tested is assembled of scrim
reinforced laminae, three additional specimens cross-sectional (through all laminae) shall be required. The tensile
strength and ultimate elongation of the test specimens shall then be determined in accordance with ASTM D 3574,
Test E.
4.5.12 Cemented seam strength.
4. 5.12.1 Specimen. The specimen used in this test shall be of any convenient length and shall have a
cross-section of 1/2 by 1 inch. The cemented seam shall be across this cross-section, duplicating production as
nearly as practical. Where the mattress is of laminae construction, a multiplicity of cemented seams shall be
included.
4.5.12.2 Apparatus. The following apparatus shall be used:
(a) Testing machine in accordance with ASTM D 412.
(b) Aging chamber in accordance with ASTM D 573.
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