1、NOT MEASUREMENT SENSITIVE MIL-DTL-32169 30 November 2004 DETAIL SPECIFICATION WHEEL ASSEMBLIES, POLYURETHANE; FOR THE BRADLEY FIGHTING VEHICLE This specification is approved for use by all Department and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers roadwheels
2、for use on the Bradley Fighting Vehicle. These are metal wheels with bonded polyurethane tires (see 6.1). For the purpose of this specification polyurethane may be any form of thermoplastic or thermosetting resins. The contractor is held fully responsible for the entire assembly/component including
3、non-elastomeric components and fasteners. 1.2 Intentionally Left Blank 2 APPLICABLE DOCUMENTS 2.1 General. The document listed in this section are specified in sections 3 and 4 of this specification or recommended for additional information or as examples. While every effort has been made to ensure
4、the completeness of this list, document users are cautioned that they must meet all specified requirement documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications,
5、 standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense index of Specifications and standards (DODISS) and supplement thereto, cited in the solicitation
6、 (see 6.2). Comments, suggestions, or questions on this document should be addressed to Tank-automotive and Armaments Command, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to standardizationtacom.army.mil Since contact information can change, you may want to verify the currency of this add
7、ress information using the ASSIST Online database at http:/assist.daps.dla.mil AMSC N/A FSC 2630 DISTRIBUTION STATEMENT A. Approved for public release, distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32169 2 SPECIFI
8、CATIONS DEPARTMENT OF DEFENSE MIL-STD-1916 - DOD Preferred Methods For Acceptance of Product. (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.
9、2 Other Government documents, drawings, 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 are those cited in the solicitation. DRAWINGS ARMY 12497867 - Wheel, Soli
10、d Polyurethane Tire. (Copies of these drawings are available from the U.S. Army Tank-automotive and Armaments Command, AMSRD-TAR-E, Warren, MI 48397-5000.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified
11、, the issues of the documents, which are DOD adopted, are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). ASTM INTERNATIONAL ASTM D412
12、- Vulcanized Rubber and Thermoplastics Elastomers Tension, Standard Test Methods (DoD Adopted). ASTM D429 - Rubber Property Adhesion to Rigid Substrates, Standard Test Methods (DoD Adopted). ASTM D624 - Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers, Standard Test Metho
13、ds (DoD Adopted). ASTM D792 - Density and Specific Gravity (Relative Density) of Plastics by Displacement, Standard Test Methods (DoD Adopted). ASTM D2137 - Rubber Property-Brittleness Point of Flexible Polymers and Coated Fabrics, Standard Test Methods (DoD Adopted). ASTM D2240 - Rubber Property -
14、Durometer Hardness, Standard Test Method (DoD Adopted). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32169 3 ASTM D4065 - Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures, Standard Practice (DoD Adopted). (Co
15、pies of these documents are available from ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 or website: http:/www.astm.org) 2.4 Order of precedence. In the event of a conflict between the text of this document and the reference cited herein, the text of this d
16、ocument takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Pre-production. Roadwheel assemblies furnished under this specification shall be products which have been tested and have passed
17、the pre-production tests specified herein. The Pre-Production process is divided into three phases as defined in section 3 of this specification: Phase I, Plant/Facilities Inspection; Phase II, Establishment of Contractors Control Plan and Compound Characteristics; and Phase III, Endurance Tests. Th
18、e procedures and requirements of these phases must be successfully completed and all requirements met prior to a contractor becoming approved. Section 4 of this specification establishes the quality control requirements based on section 3 as applicable to Bradley Vehicle polyurethane roadwheel procu
19、rement contracts. 3.1.1 Control plan. The contractor shall provide a control plan (see 4.5.1) addressing the requirements of this specification that identifies how the contractor intends to conform to this specification. This plan will require Government approval and will be included as part of the
20、Pre-production process. This plan shall be submitted to the Quality Assurance Representative (QAR) and Procuring Activity for review and approval. This control plan should be general in nature, identifying the contractors capability in conforming to the requirements of this specification and should
21、not contain proprietary information. This plan should identify subcontractor control requirements in compliance to this specification as related to polyurethane. 3.1.2 Phase I, plant/facilities inspection. The procuring activity or its authorized agent may conduct plant/facility inspections prior to
22、 the start of any pre-production testing. Subcontractors that provide polyurethane materials for processing shall be subjected to the same inspection and test requirements on that portion of the product/process that is within the subcontractors purview. 3.1.3 Phase II, establishment of contractors P
23、rocess Fingerprint Plan. Prior to the start of pre-production hardware fabrication, the contractor shall establish a Process Fingerprint Plan that describes the entire process used to produce the qualification hardware and the compound characteristics. This plan shall identify the target values and
24、ranges (limits/tolerances) the contractor expects during pre-production hardware fabrication. Once pre-production testing approval is granted, the contractor shall document these values/ranges as comparative data. This Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
25、nse from IHS-,-,-MIL-DTL-32169 4 data will be maintained during subsequent production and used by the Government as evidence of consistency of materials, formula, and manufacturing process. This plan shall bear the signatures of the Government QAR and an authorized representative of the contractor.
26、This plan shall be proprietary to the contractor and remain at the contractors facility but be made available for review by the Procuring Activity or its authorized agent. This information shall not be disclosed in whole or in part for any purpose other than to evaluate the product submitted for pre
27、-production testing. 3.1.3.1 Physical and mechanical properties. The physical and mechanical properties to be used by the contractor as comparative data are as follows: Tensile strength, Elongation, tensile stress, specific gravity, tear strength, low temperature flexibility, and accelerated aging.
28、During production, the contractor shall be required to maintain the production values within the tolerances specified in Table I (see 3.1.3). 3.1.4 Pre-production testing hardware fabrication. The fabrication of the pre-production testing hardware shall be in accordance with the approved Process Fin
29、gerprint Plan. All testing must be conducted in the presence of a Government inspector or its authorized agent, signed off for conformance to the requirements and dated. All records/test results of all lots of polyurethane materials used in preparation of all qualification hardware shall be made ava
30、ilable to the Government QAR upon request. This information shall not be disclosed in whole or in part for any purpose other than to evaluate the product submitted for pre-production testing. The Government reserves the right to conduct these tests at any time to ensure compounds in production are i
31、n conformance to the data established during pre-production testing. 3.1.5. Test records and compound identification. All test records must contain at a minimum, the compound identification and source, test results, test facility identification, dates of tests, and the name of the tester. These reco
32、rds must be signed and dated by the Government QAR or an authorized agent. The contractor will identify the method to be used during Pre-Production testing and utilize the same method during subsequent production testing. Compound numbers must be identified to the component being tested and fully id
33、entified on the applicable test records/data sheets. Any record, data sheet, or certification lacking proper identification, or one that does not contain clear and concise information will not be considered in compliance to these requirements and rejected. 3.1.6. Specimen preparation. Specimens shal
34、l be prepared in accordance with the applicable ASTM and shall be of an equivalent state of cure to that of the polyurethane wheel submitted for endurance testing. 3.2 First article. When specified (see 6.2), a first article sample shall be subjected to first article inspection in accordance with 4.
35、3.4 and 4.4. 3.3 Materials. 3.3.1 Tires. Solid tires shall consist of intractable thermoplastic, rubbery or thermosetting polymeric materials which are black in color and conform to applicable Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-3
36、2169 5 specifications and standards. The intractable thermoplastic, rubbery or thermosetting polymeric material shall not contain any metal mesh, webbing or lattice used as a reinforcement of the solid material. 3.3.2 Wheels. Materials used in metal wheels shall conform to applicable drawings, speci
37、fications, and standards. 3.3.3 Bonding materials. Adhesives, boding agents, cement, gum compounds, and materials furnished under this specification shall produce bonded rubbery or thermoplastic tires that meet or exceed the requirements of the applicable drawing and this specification. 3.3.4 Recycl
38、ed, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cyc
39、le costs. 3.3.5 Construction. Wheel assemblies furnished under this specification shall be in accordance with the applicable drawings (see Drawing 12497867) or as specified by the contracting authority. 3.3.6 Date of origin. Wheel assemblies furnished under this specification shall have been cured a
40、nd bonded a minimum of 30 days immediately preceding date of submission for acceptance. 3.4 Physical and mechanical properties. 3.4.1 Physical properties of roadwheel compounds. Physical property tests, as a minimum, will be conducted on 5 specimens taken and averaged from each compound used in the
41、roadwheels in accordance with the applicable ASTMs as follows and in accordance with Table I: Tensile Strength (ASTM D412), Elongation (ASTM D412), Tear Strength (ASTM D624) and Tensile Stress (Modulus) (ASTM D412). The production tolerances for the physical property tests, based on the average valu
42、es established during pre-production testing, shall be 15 for tensile strength, elongation, tensile stress and tear strength (see 4.9.3, 4.9.5, 4.9.7 and 4.9.10). 3.4.2 Aged properties. Physical property tests as a minimum, shall be conducted on 5 aged specimens in accordance with ASTM D412 and Tabl
43、e II. Accelerated aging shall be conducted for 166 hours (hr) at 158 degrees Fahrenheit (F) within any one specimen. The production tolerance for the change in tensile strength, tear strength, and elongation shall be not more than 15 percent (%) (see 4.9.4, 4.9.6 and 4.9.11). 3.4.3 Hydrolytic stabil
44、ity test. Hydrolytic stability testing shall be performed in accordance with ASTM D412 using Die C dumbbells on samples submitted for pre-production testing. The test shall be performed on cast material. The polyurethane shall retain 75% of the original baseline properties after 14 days and that deg
45、radation is stabilized and does not progress any further. This test shall be performed during pre-production testing to establish the values for Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-32169 6 the fingerprint plan. Values for follow-o
46、n production shall fall within the band established at the time of pre-production testing (see 4.9.8). 3.4.3.1 Procedure. Six specimens shall be immersed in water at 160 F for periods of 7 days and 14 days. The contractor may use either of the following methods; (a) the same test specimen for this t
47、est or (b) use similar/identical individual test specimens. The same bath water must be used in either method. Tensile strength, tear strength, ultimate elongation, modulus, hardness, and adhesion properties shall be determined for each condition to ascertain any degradation of the material. 3.4.4 L
48、eft intentionally blank3.4.5 Peel adhesion of wheel to polyurethane material. Special test specimens shall be fabricated consisting of wheel alloy strips bonded to lengths of the polyurethane. The metal alloy strips shall be 15 inches (in.) long and shall be of the same alloy as that used in the whe
49、el. The polyurethane shall be 15 in. long minimum (min) by 2.000 0.050 in. wide, and shall be of the same composition as that used in the roadwheel. The polyurethane shall be uniformly bonded to the alloy metal strip. The bond shall be formed using identical techniques and bonding agents used to bond the polyurethane to the roadwheel and shall be cured identically (time, pressure, temperature, relative humid
