A-A-52486
2. Steel plates and studs. The mechanical properties of the steel used in the manufacture of mount plates and studs shall be such as to enable these components to withstand, without damage, the stresses applied in connection with the performance requirements specified herein.
3. Threaded parts. Mounting stud threads and tapped holes shall be in accordance with commercial practice. The thread from, number of threads per inch, and class of fit shall be as specified on applicable drawings.
4. Design and construction. The design and construction of each resilent mount shall be in accordance with its drawing and this CID, such that it properly performs its intended function. The resilent mounts shall be of the type designed for shear loading in the vertical plane.
5. Interchangeability. All mounts furnished under this specification shall be dimensionally and functionally interchangeable with all other such mounts having the same part number.
6. Dimensions. All resilent mount dimensions shall be in accordance with the applicable drawing.
7. Bond. All metal components of the mounts shall be completely bonded to the resilent element with which each makes contact.
c. Performance.
1. Static load and proof load deflection. The mounts shall exhibit static load and proof load deflection characteristics (spring rates) in accordance with the values specified in the applicable drawing. Suggested mounting configurations are shown on figures 1 and 2. This shall be demonstrated by testing two initial production samples from the first batch of 1000 mounts and two from each subsequent batch of 2000. Prior to recording test data, the mounts shall be statically deflected twice in the shear direction a distance as recommended by the mount manufacturer for that mount During a third deflection, load readings shall be recorded at one inch deflection. The loading rate for the static load shall be 0.5 to 1 inch per minute until the specified maximum deflection is reached. The loading rate for the proof load shall be 25 ± 5 inches per minute until the specified maximum deflection is reached and held at maximum deflection for 30 to 60 seconds. The recorded loads for both static and proof loads shall be within drawing ranges. During and after testing, the sample mounts shall show no evidence of performance deterioration and no damage, such as cuts, tears, bond separation, or metal deformation.
2. Dynamic performance. A pair of mounts from the first batch of 1000 mounts and a pair from each subsequent batch of 2000 mounts shall perform as specified following, while supporting a load as specified in the applicable drawing.
a. Vibration resistance. When tested on a set up similar to that shown in figure 2, the mounts shall be capable of withstanding, without damage, vibrations at the frequencies, amplitudes and for the durations of periods specified in salient characteristic (SC) c2b and c2c. the dummy load shall be equal to the weight the mounts are required to support statically in the specific container application. Vibration shall be conducted only in the direction parallel to the vertical shear axis of the mounts. Vibration pickups shall be mounted on both the dummy load and the input platform.
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