1、Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandardsnavy.mil, with the subject line “Document Comment”. Since contact
2、information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. AMSC N/A FSC 5342 INCH-POUND MIL-DTL-19379C(SH) 10 September 2013 SUPERSEDING MIL-M-19379B(SHIPS) 21 March 1961 DETAIL SPECIFICATION MOUNTS, RESILIENT, M
3、ARE ISLAND TYPES 11M15, 11M25 AND 10M50 This specification is approved for use by the Naval Sea Systems Command and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers Mare Island Rubber Laboratory type resilient mounts use
4、d to support equipment on surface ships and submarines. This specification includes requirements and verification tests for the rubber compound and fully assembled mounts. 1.2 Classification. 1.2.1 Types (see 6.2). 11M15 Nominal resonant frequency of 11 Hertz at 15 pounds with a load range from 9 to
5、 15 pounds. 11M25 Nominal resonant frequency of 11 Hertz at 25 pounds with a load range from 15 to 25 pounds. 10M50 Nominal resonant frequency of 10 Hertz at 50 pounds with a load range from 25 to 50 pounds. 1.2.1.1 Non-magnetic designation. The suffix “NM”, following the mount type, designates non-
6、magnetic construction. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples.
7、 While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, stan
8、dards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-407 - Visual In
9、spection Guide for Rubber Molded Items (Copies of this document are available online at http:/quicksearch.dla.mil/ or https:/assist.dla.mil.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19379C(SH) 2 2.2.2 Other Government documents, drawi
10、ngs, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. NAVAL SEA SYSTEMS COMMAND (NAVSEA) DRAWI
11、NGS 803-1385824 - Mounts, Resilient Mare Island Type (Copies of this document are available from the applicable repositories listed in NAVSEA S0005-AE-PRO-010/EDM. Copies of NAVSEA S0005-AE-PRO-010/EDM are available from the Naval Logistics Library, 5450 Carlisle Pike, Mechanicsburg, PA 17055 or onl
12、ine at https:/nll.ahf.nmci.navy.mil.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM D395 - Standa
13、rd Test Methods for Rubber Property Compression Set ASTM D412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers Tension ASTM D429 - Standard Test Methods for Rubber Property Adhesion to Rigid Substrates ASTM D471 - Standard Test Method for Rubber Property Effect of Liquids A
14、STM D573 - Standard Test Method for Rubber Deterioration in an Air Oven ASTM D792 - Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement ASTM D1229 - Standard Test Method for Rubber Property Compression Set at Low Temperatures ASTM D1566 - Standard Te
15、rminology Relating to Rubber ASTM D2240 - Standard Test Method for Rubber Property Durometer Hardness ASTM D5992 - Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods (Copies of these documents are available from ASTM International, 100 Barr Harb
16、or Dr., P.O. Box C700, West Conshohocken, PA 19428-2959 or online at www.astm.org.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the t
17、ext of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. Mounts furnished under this specification shall be products that are authorized by the qualifying act
18、ivity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3). 3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the materia
19、l meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.3 Mount design. Mounts shall meet requirements of this specification and be constructed in accordance with 803-1385824. In addition to requirements contained in this specificat
20、ion, typical static load-deflection, radial dynamic stiffness, and damping performance are provided for guidance in 6.5. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19379C(SH) 3 3.4 Materials. 3.4.1 Metal. Mount metal components shall be
21、manufactured from steel or manganese bronze as specified (see 6.2). Metal shall be in accordance with the appropriate specification listed in 803-1385824; substitutions are permitted when approved by NAVSEA. Components shall be formed into shape and finished in accordance with the dimensions and all
22、owable tolerances specified in 803-1385824. 3.4.2 Rubber. 3.4.2.1 Resilient element. The resilient element of finished mounts shall be fabricated of oil resistant compounds utilizing polymerized chloroprene as the basic material and molded into the form as shown in 803-1385824. 3.4.2.2 Physical requ
23、irements. Physical properties of the cured rubber compound used in the resilient element shall meet all requirements specified in table I. TABLE I. Physical requirements. Property Mount type Verification method 11M15 and 11M25 10M50 1. Tensile strength (minimum) before aging 2200 psi 2800 psi 4.4.1.
24、1 2. Ultimate elongation (minimum) before aging 650% 575% 4.4.1.1 3. Tensile strength (minimum) after oven aging at 194 F 2100 psi 2700 psi 4.4.1.1 and 4.4.1.7 4. Ultimate elongation (minimum) after oven aging at 194 F 600% 525% 4.4.1.1 and 4.4.1.7 5. Compression set (maximum) after oven aging at 19
25、4 F 40% 34% 4.4.1.2 and 4.4.1.7 6. Cold compression set (maximum) 50% 60% 4.4.1.3 7. Hardness 385 485 4.4.1.4 8. Volume change in oil (maximum) 15% 4.4.1.5 9. Adhesion to metal (minimum) 450 psi 550 psi 4.4.1.6 10. Specific gravity Within 0.02 of the value measured during qualification 4.4.1.8 3.5 P
26、erformance and construction requirements for finished mounts. 3.5.1 Construction requirements. Mounts shall be constructed in accordance with 803-1385824. In addition, there shall be no backrinding, blisters, tears, cracks, or other defects on the outer surface of the resilient element. MIL-STD-407,
27、 in conjunction with ASTM D1566, may be used to assist in identifying defects in the resilient element (see 4.3.3.1). 3.5.2 Dynamic stiffness. The dynamic stiffness of mounts, when tested in the axial direction in accordance with 4.4.2.1, shall be within the specified limits of table II. Provided by
28、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19379C(SH) 4 TABLE II. Axial dynamic stiffness requirements. Mount type Requirement limits Axial load (lb) Dynamic stiffness (lb/in) 11M15 9 190 to 230 12 181 to 224 15 166 to 214 11M25 15 283 to 398 18 27
29、8 to 403 22 269 to 404 25 260 to 403 10M50 25 459 to 590 33 438 to 562 42 429 to 557 50 414 to 553 3.5.3 Static strength. When tested in accordance with 4.4.2.2, mounts shall not show any separation, break in or between component parts, debonding, or permanent deformation of metal parts. 3.5.4 Fatig
30、ue-drift. When tested in accordance with 4.4.2.3, mounts shall not show any indication of damage to the resilient element, rubber-to-metal bond, and metal parts. The drift occurring to the type 11M15, 11M25, and 10M50 mounts during these tests shall not exceed 0.017, 0.025, and 0.040 inch, respectiv
31、ely. 3.5.5 Delamination and porosity. When tested in accordance with 4.4.2.4, the rubber shall not show evidence of porosity, separation into distinct layers, or laminations. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a.
32、 Qualification inspection (see 4.2). b. Conformance inspection (see 4.3). 4.2 Qualification inspection. The inspection and tests specified herein are required to qualify mounts produced by a manufacturer for inclusion in the Qualified Products List (QPL) for this specification. Refer to 3.1 and 6.3.
33、 Qualification inspection shall be performed on finished mounts and the rubber compound. 4.2.1 Qualification inspection of the rubber compound. Specimens described in table III shall be produced from the rubber compound which is mixed for the manufacture of all mounts subjected to qualification insp
34、ection. The manufacturer shall certify that the specimens are of the same material and equivalent cure as the mounts tested for qualification. These specimens shall be subjected to the tests specified in table IV to determine compliance with 3.4.2.2. If any specimens tested fail to meet any requirem
35、ent, all mounts manufactured for qualification from rubber batches represented by that specimen shall be rejected. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19379C(SH) 5 TABLE III. Rubber specimens for qualification. Quantity Specimen d
36、escription Property to be measured 6 ASTM D412, Die C from sheets 0.080.01 by 6 by 6 inches Tensile strength and ultimate elongation (initial and aged), specific gravity 3 Rectangular: 0.080.01 by 1 by 2 inches Resistance to oil (volume change in oil) 3 ASTM D429, Method A Cylinder: 0.1250.005-inch
37、thickness by 1.5970.005-inch diameter Adhesion to metal 5 Cylinder: 0.490.02-inch height by 1.140.02-inch diameter Hardness and compression set TABLE IV. Qualification tests on rubber specimens. Property Verification method Requirement 1. Initial tensile strength 4.4.1.1 3.4.2.2 (table I, no. 1) 2.
38、Initial ultimate elongation 4.4.1.1 3.4.2.2 (table I, no. 2) 3. Tensile strength after oven aging 4.4.1.1 and 4.4.1.7 3.4.2.2 (table I, no. 3) 4. Ultimate elongation after oven aging 4.4.1.1 and 4.4.1.7 3.4.2.2 (table I, no. 4) 5. Compression set after oven aging 4.4.1.2 and 4.4.1.7 3.4.2.2 (table I
39、, no. 5) 6. Cold compression set 4.4.1.3 3.4.2.2 (table I, no. 6) 7. Hardness 4.4.1.4 3.4.2.2 (table I, no. 7) 8. Volume change in oil 4.4.1.5 3.4.2.2 (table I, no. 8) 9. Adhesion to metal 4.4.1.6 3.4.2.2 (table I, no. 9) 10. Specific gravity 4.4.1.8 3.4.2.2 (table I, no. 10) 4.2.2 Qualification ins
40、pection of finished mounts. If rubber specimens meet all requirements associated with qualification inspection (see 4.2.1), then finished mounts shall be subjected to qualification inspection to determine compliance with 3.3, 3.5, and 803 1385824. Four mounts for each type manufactured shall undergo
41、 qualification testing. Two mounts shall be tested in accordance with table V. The remaining two mounts shall be tested in accordance with table VI. Mounts shall be tested in the sequence shown in each table. TABLE V. Qualification tests on finished mounts, group one. Property Verification method Re
42、quirement 1. Physical appearance, dimensions and materials 803-1385824 and table X 3.5.1 2. Dynamic stiffness 4.4.2.1 3.5.2 3. Static strength 4.4.2.2 3.5.3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-19379C(SH) 6 TABLE VI. Qualification
43、tests on finished mounts, group two. Property Verification method Requirement 1. Physical appearance, dimensions and materials 803-1385824 and table X 3.5.1 2. Dynamic stiffness 4.4.2.1 3.5.2 3. Fatigue-drift 4.4.2.3 3.5.4 4. Delamination and porosity 4.4.2.4 3.5.5 4.3 Conformance inspection. Confor
44、mance inspection shall be performed on each production lot. 4.3.1 Lot. For the purpose of sampling for conformance inspection, a lot shall contain all mounts of one type produced at the same time in the same facility under the same conditions with the same batch of rubber compound. A lot number shal
45、l be assigned to the mounts and shall not be repeated in any one quarter. The lot number with elastomer cure date (quarter, year) shall be traceable to the rubber batch number, manufacturing/process control records, and conformance documentation. The lot number along with cure date shall be permanen
46、tly marked on each mount (refer to 803-1385824) and be included on all shipping documents, packages, and shipping containers. 4.3.2 Conformance inspection of the rubber compound. The specimens identified in table VII shall be prepared for each mount lot produced. The specimens shall be made from the
47、 same batch of rubber compound mixed for the manufacture of mounts in the lot. The specimens shall be certified to be of the same material and equivalent cure as the corresponding lot of finished mounts. These specimens shall be subjected to verification tests specified in table VIII to determine co
48、mpliance with 3.4.2.2. If any specimens tested fail to meet any requirement, all mounts in the lot represented by that specimen shall be rejected. TABLE VII. Rubber specimens for conformance inspection. Quantity Specimen description Property to be measured 3 ASTM D412, Die C from sheets 0.080.01 by
49、6 by 6 inches Tensile strength and ultimate elongation, specific gravity 1 Cylinder: 0.500.02 inch height by 1.140.02 inch diameter Hardness TABLE VIII. Conformance tests on rubber specimens. Verification test Test method Requirement 1. Initial tensile strength 4.4.1.1 3.4.2.2 (table I, no. 1) 2. Initial ultimate elongation 4.4.1.1 3.4.2.2 (table I, no. 2) 3. Specific gravity 4.4.1.8 3.4.2.2 (table I, n
