1、 A- A-5 248 b = 74 03b2232 522 1 INCH-POUND 1 A-A-52 486 January 18, 1994 Superseding MIL-M-45907A(AT) 13 December 1984 COMMERCIAL ITEM DESCRIPTION MOUNT, SHIPPING CONTAINER, RESILIENT: SHOCK AND VIBRATION DAMPING The General Services Administration has authorized the use of this commercial item des
2、cription (CID) as a replacement or MIL-M-45907A(AT), which is canceled. ABSTRACT engines , transmissions and axles) when transported in reusable metal shipping containers. SALIENT CHARACTERISTICS This CID covers resilient mounts used to support major components (such as a. Description. Mounts furnis
3、hed under this CID are intended for use in securing major components of military vehicles (engines, transmissions, etc.) in reusable shipping containers. The mount functions as a shock absorber and vibration damper between the container and the component mounted therein. The specific shape, dimensio
4、ns, and characteristics of each mount shall be defined by its drawing (see note a). b. Materials. Materials shall be as specified herein and in the applicable resilient mount drawing. All material shall be uniform in quality and free from defects which could adversely affect performance or serviceab
5、ility of the mounts. The use of recovered materials made in compliance with regulatory requirements is acceptable providing that all requirements of this CID are met (see note c). elements of the mounts shall be an appropriate elastomer compounded to meet the specified performance requirements. 1. E
6、lastomers. The elastomeric material comprising the resilient 1 Beneficial comments, recommendations, additions, deletions clarifications, etc. and any other data which may improve this document should be sent by letter to: U.S. Army Tank-Automotive Command, ATTN: AMSTA-GDS, Warren, MI 48397-5000. AM
7、SC N/A FSC 5340 DISTRIBUTION STATEMENT A. Approved for public release: distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52486 W 9999974 0362233 469 A-A- 5 2 48 6 The mechanical properties of the steel used in the manufac
8、ture 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. accordance with commercial practice. The thread form, number of threads per inch, and class of fit shall be
9、as specified on applicable drawings. 2. Steel plates and studs. 3. Threaded parts. Mounting stud threads and tapped holes shall be in I 4. Design and construction. The design and construction of each resilient mount shall be in accordance with its drawing and this CID, such that it properly perfoms
10、its intended function. type designed for shear loading in the vertical plane. The resilient mounts shall be of the 5. Interchangeability. All mounts furnished under this specification shall bp dimensionally and functionally interchangeable with all other such mounts having the same part number. with
11、 the applicable drawing. All metal components of the mounts shall be completely bonded to the resilient element with which each makes contact. 6. Dimensions. All resilient mount dimensions shall be in accordance 7. - Bond. c. Perf ormance. 1. Static load and proof load deflection. The mounts shall e
12、xhibit static load and proof load deflection characteristic8 (spring rates) in accordance with the values specified in the applicable drawing. 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 mount
13、s 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
14、 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 reco
15、rded 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 aariage, such as cuts, tears, bond separation, or metal deformation. Suggested test 2. Dynamic performance. A pair of moun
16、ts 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. that shown in figure 2, the mounts shall be capable of withstanding, without damage, vibration at the freq
17、uencies, amplitudes and for the duration 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 th
18、e vertical shear axis of the mounts. Vibration pickups shall be mounted on both the dummy load and the input platform. a. Vibration resistance. When tested on a set up similar to 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52486 m 9999974 0
19、162234 3T5 m A-A-52486 1 DIRECTION OF LOAD FIGURE 1. Static load deflection. 7 FIGURE 2. Vibration test. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5248b 9999974 0362235 233 A-A- 5 2 4 8 6 b. Resonance vibration frequency. When tested on a
20、 set up similar to that shown in figure 2, and after being subjected to vibration at 0.06 inch double amplitude over a frequency range of 2 to 60 cycles per second (cps), the mounts shall be such as to preclude a natural or resonant vibration frequency within the carrier (railway or motor freight) v
21、ibration frequency range of 2 to 7 cps. to that shown in figure 2, the mounts shall be capable of withstanding, without damage, a total duration period of 21 + 2 minutes when exposed for 3 sweeps to the frequency range of 2 to 60 cps and return to 2 cps. time shall be 7 + 1 minutes. Vibration shall
22、be steady state for 15 minutes when the resonant frequency is above 20 cps. permitted to avoid overheating of elastomeric mounts. center of gravity system along the vertical axis end cri accelerometer mounted on the dummy load directly over the center of gravity, the shock test shall be carried in a
23、 set up similar to the one in SC c2a. shall be dropped flat to a hard non-yielding surface three times from a height of 12 + 1/2 inches. The mounts shall evidence no damage and no shock greater than i5 9s shall be registered. 4. Durability. The mounts shall be capable of withstanding, without eviden
24、ce of damage, 50 drops from a height of 18 + 0.5 inches. The contractor shall perform appropriate drop tests t verify conformance to this requirement. c. Resonance vibration fatigue. When tested on a set up similar Each sweep Intermittent dwell testing is 3. Shock attenuation. With the mounts and du
25、mmy load forming a The entire assembly d. Environmental requirements. 1. Accelerated aging. After exposure to accelerated temperatures of 158 to 160 degrees Fahrenheit (OF) for a period of 7 days, two mounts from the first batch of 1000 and two from each-subsequent batch of 2000 shall be allowed to
26、cool to room temperature and then shall meet the requirements of SC cl within 20 percent of the original room temperature values. The contractor shall devise and perform accelerated aging at temperature tests to verify conformance to this requirement. 2. Low temperature. The mounts shall evidence no
27、 damage and no shock greater than 35 gs shall be registered when the entire assembly, after being subjected to a teniperature of -38O to -40F for 16 hours, is still or immediately after being removed from the cold chamber and subjected to SC c3 test. 3. High temperature. The mounts shall evidence no
28、 damage and no shock greater than 15 gs shall be registered when the entire assembly, after being subjected to a temperature of 158O to 16OoF for not less than 4 hours, is removed from the ventilated oven and subjected to SC c3 test. e. Identification and markings. The mounts shall be marked for ide
29、ntification in accordance with the drawing for the specific part number. cure date (month and year) and the manufacturers identification code (CAGE) shall also be molded into the resilient element. examined during inspection to verify conformance to the identification requirements herein. The The mo
30、unts shall be visually . 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-52486 m 9999474 OLb2236 178 A-A-5 2 4 8 6 QUALITY ASSURANCE PROVISIONS a. Responsibility for inspection. The contractor is responsible for the performance of all inspectio
31、ns (examinations and tests). first article sample shall be inspected to verify conformance to the salient characteristics in this CID. Government shall not relieve the contractor of the obligation to supply items that are fully representative of those inspected as a first article sample. c. Contract
32、or certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this commercial item description and that the product conforms to the producers own drawings, specifications, workmanship standards, and quality assurance
33、 practices. Items with known defects shall not be submitted for Goverment acceptance. such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract. PRESERVATION, PACKAGXNG, PACKING, LABELING, AND MARKING 9 b. First article inspecti
34、on. Unless otherwise specified (see note a), a Approval of the first article sample by the The Government reserves the right to require proof Of Preservation, packaging, packing, labeling and marking for the desired level shall be as specified in the contract (see note a). MOTES (This section contai
35、ns information of a general or explanatory nature that a. Ordering data. Acquisition documents must specify the following: may be helpful but is not mandatory.) O 1. Title, number, and date of this CID. 2. Title, number and revision letter of the applicable engineering drawing for the resilient moun
36、t. 3. Arrangements for first article inspection or whether first article is not required. 4. Applicable level and packaging requirements. b. Cross-reference data. Resilient mounts conforming to this CID are i.nterchangeable/substitutable with resilient mounts conforming to MIL-M-45907A(AT) dated 13
37、December 1984. c. Regulatory requirements. The offeror/contractcr is encouraged to use recovered materials in accordance with Public Law 94-580 to the maximum extent practical. MILITARY INTERESTS: C!ustodian Army - AT Review activities CIVIL AGENCY COORDINATING ACTIVITY: GSA-FSS Preparing activity: Army-AT DLA - IS DISC - EHC 5 (Project 5340-2093) I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
