1、POUNDS MIL-PRF-9884F 27 Mav 1997 SUPERSEDING 28 December 1984 MIL-H-98 84E PERFORMANCE SPECFICATION PAD, ENERGY DISSIPATOR This specification is approved for use by the Department of the Army, Natick Research, Development, and Engineering Center, and is available for use by all Departments and Agenc
2、ies of the Department of Defense (DoD). 1. SCOPE 1.1 Scope. This specification covers the performance and acceptance requirements for a pad which dissipates the energy at impact of items that are airdropped. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in s
3、ections 3 and 4 of this specification. This section does not include documents cited in other sections of the specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must
4、meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. (None). Beneficial comments (rtcommendations, additions, deletions) and any pertinent data which may be used in improving this document should be addre
5、ssed to: U.S. Army Natick Research, Development, and Engineering Center, Attn: SSCNC-E, Natick, MA 01760-5018 by using the Standardization Document Improvement Proposal D Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 1670 Licensed by Information Handling ServicesProvide
6、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-SBB4F m 9999906 2055669 489 MIL-PRF-9884F 2.3 Non-Government publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise specified, the iss
7、ues 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). TECHNICAL ASSOCIATION OF THE PULP AND PA
8、PER INDUSTRY (TAPPI) Standard T44 1 - Water Adsorptiveness of Sized (Non-Bibulous) Paper and Paperboard (Cobb Test) (Applications for copies should be addressed to the Technical Association of the Pulp and Paper Industry Standards, Technology Park, PO Box 1051 13, Atlanta, GA 30348). 2.4 Order of pr
9、ecedence. In the event of a conflict between the text of this document and the references cited herein, the text 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 First a
10、rticle. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.1.1. 3.2 ODerating requirements. The energy dissipator pad shall satisfj the following user- oriented requirements. 3.2.1 Dynamic aushing stress. The energy dissipator pad shali have a dyna
11、mic crushing stress of 6300 i 900 pounds per square foot to 70% minimum strain, and the stress strain curve shaii be essentially rectangular. 3.2.2 Rebound energy. The rebound energy of the energy dissipator pad shall not exceed 8% of the absorbed energy to a 70% minimum strain. 3.2.3 Static load. T
12、he energy dissipator pad shall support a 4000 pound per square foot minimum static load. 3.2.4 Cutability. The energy dissipator pad shall be capable of being cut into segments, by hand, with a knife. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
13、- MIL-PRF-9884F = 9999906 2055670 &TO W MIL-PFW-98 84F 3.3 Interface and interoDerabilitv requirements. 3.3.1 Dimensions The energy dissipator pad shall be 36 inches by 96 inches 2 1/2 inch and the thickness shall be 3 inches 2 1/16 inch. 3.3.2 Surfaces. The top and bottom surfaces of the energy dis
14、sipator pad shall be capable of being bonded to other pads or bonded to wood using adhesive paste (NSN 8040-00-273-8713) (see 6.6). 3.4 Supriort or ownershir, requirements. 3.4.1 Weight. The weight of one cubic foot of the energy dissipator pad shall not exceed two pounds. 3.4.2 Water resistant. The
15、 energy dissipator pad shall be resistant to water without degradation of the energy dissipating characteristics of the pad. 3.4.3 Moisture content. The percent of moisture of the energy dissipator pad shall not exceed 12%. 3.4.4 Water adsorptiveness. The energy dissipator pad shall have a maximum w
16、ater adsorptiveness of 1 O0 grams per square meter. 3.5 Environmental requirements. The energy dissipator pad shall .be fiinctional in ambient temperatures from -4OOF to +125!F. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
17、 a. First article inspection (see 4.1.1) b. Conformance inspection (see 4.1.2) 4.1.1 First article inspection. When a first article inspection is required (see 3.1 and 6.2), the first article shall be examined for all the verifications listed in table I. 4.1.2 Conformance inspection. Conformance ins
18、pection includes those examinations and tests from table I as defined in the contract or purchase order (see 6.2 and 6.4). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-SBBYF SSSSSOb 2055b71 037 MlL-PRF-98 84F TABLE1 Verifi Title OPERATI
19、NG REQUIREMENTS Dynamic crushing street Rebound energy Static load cutability INTERFACE AND INTEROPERABILITY REQUIREMENTS Dimensions surfbces SUPPORT OR OWNERSHIP REQUIREMENTS weight Water resistant Moisture content Water adsorptiveness ENVIRONMENTALREOUIREMENTS &n methods Requirements 3.2 3.2.1 3.2
20、.2 3.2.3 3.2.4 3.3 3.3.1 3.3.2 3.4 3.4.1 3.4.2 3.4.3 3.4.4 3.5 Verification 4.3 4.3.1 4.3.1 4.3.2 4.3.3 4.4 4.4.1 4.4.2 4.5 4.5.1 4.5.2 4.5.3 4.5.4 4.6 4.2 Verificatio n metu . Verification methods can include visual examination, measurements, testing, certicaion and similarity to previously-approve
21、d or previously-qualified designs. 4.2.1 Verification alternab va. The manufacturer may propose alternative test methods, techniques, or equipment, including the application of statistid process control, or cost-effective sampling procedures to ver performance. The contract may sp& alternatives that
22、 replace verifications required by this specification. 4.3 Operat ne requ irements verification. All user requirements shall be verified as follows: t 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-PRF-7884F 0b 2055b72 T73 MIL-PRF-9 8 84F 4.3
23、.1 Dvnamic crushin- stress and rebound energ verification. The sample unit shall consist of two specimens, each 16 inches by 18 inches, cut from each of five pads selected at random from the lot. One specimen shall be cut from one end of the pad, and the second from the opposite end. The two specime
24、ns fiom each pad shall be bonded or taped to each other to form a &inch thick sample unit. Each sample unit shall be tested for dynamic crushing stress and rebound energy to a 70% minimum strain. Each sample unit shall be impacted by a mass with a contact area of at least 16 inches by 18 inches at a
25、 velocity of 28 to 30 feet per second that will crush to at least 70% of the sample thickness. Veri that the crushing stress for each sample unit is 6300 essentially rectangular for a minimum of O to 70% strain. The rebound energy shall not exceed 8% of the absorbed energy to a 70% minimum strain. A
26、 retest is permitted if one of the five sample units tested fail to meet the requirements. The number of sample units for a retest shall be eight. Veri that seven of the eight retest samples meet the requirements specified above. 900 pounds per square foot to 70% minimum strain and the stress-strain
27、 curve shall be 4.3.2 Static load verification. A specimen 12 inches square, shall be cut from a pad selected at random from the lot. A 4000-pound minimum static load shall be applied uniformly on the top surface of the specimen and allowed to sit for a minimum of 5 minutes. Veri that the specimen d
28、oes not deflect greater than 1/16 inch. 4.3.3 Cutability verification. The specimen shall be one pad selected at random. A pad used for cutting the specimens in 4.3.1 may be used. Ver cutability using a parachute riggers knife (2-1/2 inch minimum blade). The pad shall be capable of being cut by hand
29、, in two separate pieces, across the width with two strokes of the knife. If necessary, &er the first cut, cut across the pad again on the same side or turn the pad over and cut in line with the first cut. The pad may be folded into two pieces by bending along the first cut line and cutting along th
30、e fold line. 4.4 Interface and interoDerabilitv verification. All interface and interoperabiiity requirements shall be verified as follows: 4.4.1 Veri, by measuring that the dimensions of the energy dissipator pad are 36 inches by 96 inches 2 1/2 inch, and the thickness is 3 inches 2 1/16 inch. Thes
31、e dimensions are necessary to be compatible with current field manuais and methods of storing. 4.4.2 Surface bonding verification. The surfaces of the energy dissipator pad shall be capable of being bonded to each other and to pieces of wood using the adhesive paste cited in current field manuals (s
32、ee 6.6). Veri that there is no shifting or movement of the pads after adhesive has dried. 4.5 Support or ownership verification. All support or ownership requirements shall be verified as follows: 4.5.1 Wei-ht examination. Veri, by weighing, that one cubic foot of the energy dissipator 5 Provided by
33、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-98 84F pad weighs no more than two pounds. 4.5.2 Water resistant verification. A specimen, 8 inches by 24 inches, shall be cut from a pad selected at random fiom the lot. If the top and bottom of the energ
34、y dissipator pad has a covering protecting the core, puncture it in not less than six places on both sides (if applicable) to allow water to enter into the core structure. Immerse the specimen in tap water at room temperature for a minimum of 60 minutes. The top of the specimen shall be at least 1 i
35、nch below the surface of the water. After the immersion period, remove the specimen from the water and shake to remove excess water. If equipped with a protective covering, remove either the top or bottom covering. Verify that there is no separation failure greater than 2 inches in any direction bet
36、ween the covering and the core. If there is a cover on the opposite side, remove it. Separate the core structure across the width of the specimen in three places. Verify that the method of securing the core structure is not affected by water immersion. Not more than one failure shall occur in any on
37、e of the three separations. 4.5.3 Moisture content verification. Cut two specimens, each measuring 16 inches by 18 inches, fiom opposite ends of each of five pads randomly selected from the lot. Subject each specimen to approximately 360F in a drying oven for a period of 2 hours minimum. Each specim
38、en shall be weighed to the nearest 114 ounce, both prior to and &er being dried. For each specimen, the percent of moisture shall be computed by dividing the loss of weight after heating by the weight before heating and multiplying by 100. Ver that the percent of moisture of the pad shall not exceed
39、 12%. Samples required shall have been manufactured at least 24 hours prior to being subjected to this verification. 4.5.4 Water adsorptiveness verification. If paper or similar water adsorptive material is used for the core, water adsorptiveness of each side of the material shall be determined. Ver
40、i in accordance with TAPP1 Standard T44 1 at an exposure time of 5 minutes minimum. Results for each exposure shall be determined to the nearest 0.01 gram and the average of 10 results calculated for each side. The maximum water adsorptiveness for each side shall be 100 grms per a square meter. 4.6
41、Environmental certification. The contractor shall cedi that the energy dissipator pad is finctional at ambient temperatures of -40F to +125“F. 5. PACKAGING 5.1 Packaginq. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When actual packag
42、ing of materiel is to be performed by DoD personnel, these personnel need to contact the responsible packaging activity to ascertain requisite 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-9884F packaging requirements. Packaging requireme
43、nts are maintained by the Inventory Control Points packaging activity within the Military Department or Defense Agency, or within the Military Departments System Command. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automated packaging files, CD-ROM
44、 products, or by contacting the responsible packaging activity. 6. NOTES (This section contains information of a general or explanatory nature which may be helpful, but is not mandatory). 6.1 Intended use. The energy dissipator pad is cut into sections and made into stacks which are used as impact e
45、nergy dissipators for airdrop of supplies and equipment rigged on platforms and delivered by parachute to troops in the field. 6.2 Acquisition requirements. Acquisition documents must spec the following: a) Title, number, and date of this specification. b) Issue of DoDISS to be cited in the solicita
46、tion, and, if required the specific issue of individual documents referenced (see 2.3). c) When a first article is required (see 3.1,4.1.1 and 6.3). d) Sampling for conformance inspection (see 4.1.2 and 6.4). e) Packaging requirements (see 5.1). 6.3 First article. When requiring a first article insp
47、ection, contracting documents should provide specific guidance to offerors. This guidance should cover whether the first article is a first article sample, a first production item, or the number of test items. These documents should also include specific instructions regarding arrangements for exami
48、nations, approval of first article test results and disposition of first articles. Pre-solicitation documents should provide Government waiver rights for samples for first article inspection to bidders offering a previously- acquired or tested product. Bidders offering such products who wish to rely
49、 on such production testing must furnish evidence with the bid that prior Government approval is appropriate for the pending contract. 6.4 Conformance inspection. Mordable conformance inspection with confidence varies depending upon a number of procurement risk factors. Some of these factors include contractor past performance, government schedules and budget, product material and design maturity, manufacturing capital
