1、MIL-S-ZLlLSLlA 93 9797906 OlL4L L W MIL-S-24154A( SHIPS) 10 March 1967 SUPERSEDING MIL-S-24154( SHIPS) 30 July 1965 (See 6.8.) MI LI TARY SPECIFL CATION SYNTACTIC BUOYANCY MATERIAL FOR HIGH HYDROSTATIC PRESSURES I. SCOPE 1.1 Scope. - This specification covers requirements for rigid syntactic buoyanc
2、y materials used to provide buoyancy for deep ocean submerged research vehicles, and other related applications. following typss, as specified (see 6.2). I. 2 Classification. - The syntactic byoyancy material shall be of the i f r Type I - For 4,500 p.s.i.g. hydrostatic pressure. Type II -For 10,000
3、 p.s.i.g. hydrostatic pressure. 2. APPLICABLE DOCUMENTS 2.1 The following document, of the issue in effect on date of invitation for bids or request for proposal, forms a part of the specification to the extent specified herein. STANDARD MI LI TARY MIL-STD-414 - Sampling Procedures and Tables for In
4、s-ction by Variables For Percent Defective. (Copies of specifications, standards drawings , and publications required by suppliers in connection with specific procurement functions should be obined from the procuring activity or as directed by the contracting officer.) FSC 9330 -I Licensed by Inform
5、ation Handling ServicesMIL-S-24154A( SHIPS) I 2.2 Other Dub1ications.- The following documents form a Dart of this specification to the extent specified herein. Unless otherwise indicated, the issue 5n effect on date of invitation for bids or request for prooosal shall apply. AMERICAN SOCIETY FOR TE
6、STING AND MATERIALS (ASTM) D63 - Tensile Properties of Plastics. D695 - Compressive Properties of Rigid Plastics. D732 - Shear Strength of Plastics. DI622 - Apparent Density of Rigid Cellular Plastics. (Application for copies should be addressed to the American Society for Testing and Materials, 191
7、6 Race Street, Philadelphia, Pa. 19103,) OFFICIAL CLASSIFICATION COMMITTEE Uniform Freight Classification Rules. (Application for copies should be addressed to the fficial Classification Committee, 1 Park Avenue at 33rd Street, New York, N. Y, 10016.) (Technical society and technical association spe
8、cifications and standards are generally available for reference from librapiec. distributed among technical groups and using Federal agencies. ) They are also 3.1 Qualification. - The syntactic buoyancy material furnished under this specification shall be.products which are qualified for listing on
9、the applicable qualified products list at the time set for opening of bids (see 4.2 and 6.6). 3.1 . 1 For qualification, the physical properties of the syntactic buoyancy msteri.al shall conform to tables I and II before and after exposure to the test cycles of 4.6.6 and 4.6.7. I. 2 Licensed by Info
10、rmation Handling ServicesMIL-S-24L54A 73 7977706 OLL8483 5 t i Table I - Physical requirements before and after 1,000 cycle hydrostatic exposure (qualification tests only). Property I/ Density (max,)(block)- (lbs/cu , f t, ) module with skin Densi ty (max ) (lbs/cu. f t. ) specimen Water absorption
11、(max.) (percent, by weight) Uniaxial ui tima te compressive strength bs/sq,in. (min.) 0.2 percent offset uniaxial compressive stress, lbs. /sq . in. (min. ) Compressive modulus lbs ,/sq , in, (min. ) Tensile strength lbs.lsq.5n. (min.) Shear strength lbs ./sq. in. (min ) Bulk modulus (min.) lbs .-/s
12、q. in. Hydrostatic compressive strength, lbs./sq. in. (min. ) - - Hydrostatic compressive , strength, ma. reduction from initial before ex- posure strength, percent - Ty Before exposure 38 38 - 7,000 5,000 300,000 1,500 2,000 275 , O00 9,000 - Before !XD osur e 44 44 - 12,500 10,000 also, water abso
13、rption, after exposure uniaxial compressive strength, after exposure 0.2 percent offset uniaxial compressive stress, and after exposure compressive modulus can be determined from another set of specimens. 2/ After 1,000 cycles of hydrostatic exposure between O .to 4,500 p.,c.i.g. 1/ After 1,000 cycl
14、es of hydrostatic exposure between O to 10,000 p.6.i.g. Licensed by Information Handling ServicesMIL-S-ZYLSYA 73 W 7779706 OLL4Y 7 I MIL-S-24I54.A (SKIPS) - !Syp.e I Type II 2/ exeosure exoosur figure 1 graphically shows stratification. This provides nine specimens for determining density and initia
15、l compressive properties and nine for providing water absorption and after exposure compressive properties, representing each of the non stratified sections. shear specimens shall be randomly selected from the top-corner specimen, middle- corner, bottom-corner, middle-edge, and middle center. Five t
16、ensile, three bulk modulus and three hydrostatic compressive strength specimens shall be randomly selected from the remaining 12 by 12 by 4 inch section shown on figure I. top-center, top-edge, top-corner, middle-center, middle-edge, middle- Five . .- 4.4.2 SamDliw for qualitsr conformance inspectio
17、n. inspected for conformance with 4.5.2. - All modules shall be 4.4.3 Sampling for quditsr conformance testing. - From each lot, modules Modules tested shall represent largest (in volume) production sizes, shall be selected in accordance with MIL-STD-414, Section B at an A.Q.L. of 4.0 percent. unles
18、s otherwise specified (see 6.2). , 4.4.4 Selection of individual specimens. - From each sample module selected shall be taken for each of the destructive tests specified The total number of specimens for each test shall contain I in 4.4.3, one specim individual specimen). an approxmately equal numbe
19、r representing the top, middle, and bottom of the sample . modules. For example, specimens shall be selected from the top of one module, the . middle of the second module, the bottom of the third module, etc., to obtain a . representative sample. 4.5.3 (see footnote !? of table II for properties whi
20、ch can be determined with an 4.4.5 Acceptable quality level. - Lots shall be accepted or rejected on the basis of an acceptable quality level (A.Q.L. ) of 4.0 percent for each test separately. Procedures of MIL-STD-414, Section B shall be followed, , 6 t . _ . _I . . . . . . . # I Licensed by Inform
21、ation Handling ServicesMIL-.S-24154A( SHIPS) I :i i i 6 t. i 4.5 Quality conformance insDection and tests. - 4.5.1 Lo& - For the purpose of sampling, examination and test, a lot shall consist of one batch of microspheres and resin mixed at the same time in the same mixer and subsequently poured into
22、 molds to form one or more modules. 4.5.2 fiamination, - Fkch module shall be examined for size and form, dimensional tolerance, and defects and workmanship to determine conformance with the requirements of this specification. with the requirements of this specification shall be cause for rejection.
23、 Any module found not to be in conformance 4.5.3 Quality conformance tests. - Quality conformance tests shall consist of the tests specified in 4.6 except that 4.6.7.1 shall not apply. properties of test specimens shall meet all the reqrements of 3.2 (table II ). The tests of 4.6.9 and 4.6.10 shall
24、be run only on the first, middle and last lot or as specified (see 6.2). Physical 4.6 Test methods. - Each individual test value shall be reported. 4.6.1 Selection of test specimens. - Test specimens shall be selected as specified in 4.4.1 for qualification tests and 4.4.4 for quality conformance te
25、sts. . 4.6.2 Standard test specimen. - Unless otherwise specified (see 6.2), the standard I-inch diameter by 2-inch long cylindrical test specimen shall be used. “he dimensional tolerance shall be plus or minus 0.1 inch. 4.6.3 Conditioning of test specimens. - Test specimens shall be conditioned in
26、a standard laboratory atmosphere of 23O 2 I .loc. (73.4.O 5 2F. ) and 50 +, 2 percent relative humidity for a minimum of 24 hours prior to testing. 4.6.4 Test conditions. - Tests shall be conducted in a standard laboratory atmosphere of 23O +, l.lC. (73.4O + 2OF.) and 50 5 2 percent relative humidit
27、y unless otherwise specified in the testing method or in this specification. 4.6.5 Tests for density. - 4.6.5.1 With resin skin. - Prior to sectioning the sample, the overall density of the sample with the skin (see 4.2.1) shall be determined. sample to the nearest 0.1 inch and calculate the volume
28、in cubic inches, and weigh to the nearest I .O gram. Calculate density by: Measure the X 3.81 = Density (lbs./cu.ft. ) Weight of sample (grams)- Volume of sample (CU. in.) P - Licensed by Information Handling Services- MIL-S-24154A 73 W 7777706 OLLq 4 W MIL-S-24154A( SHIPS) 4.6.5.2 Density of specim
29、ens (without resin skin). - One-inch diameter by ( j 2-inch long cylindrical test specimens shall be used to determine the density of the syntactic material in accordance with ASTM 1622. 4.6.6 EXU osure tests. - Before physical tests are performed, the appropriate specimens shall be exposed continuo
30、usly in a liquid for one week at &500 p.s.i.g. hydrostatic pressure for type I and at 10,000 p.s.i.g. hydrostatic pressure for type II. Unless otherwise specified (see 6.2), the exposure liquid for immersion tests shall be tap water. 4.6.7 Liquid absomtion. - -Ese l-inch diameter by 2-inch long test
31、 specimens to test liquid at 75 +, 10 F. for 10 seconds (see 4.6.6). dry in a paper towel and immediately weigh to the nearest milligram, specimens for one week in the test liquid at 4,500 p.s.i.g. hydrostatic pressure for type I and at 10,000 p.s.i.g. hydrostatic pressure for type II, specimens fro
32、m the test fluid, wipe dry in a paper towel and immediately weigh to the nearest milligram. Wipe specimen -ose Remove Calculate liquid absorption by: - initial X I00 = percent liquid absorption by weight Initial weight ,!+*6,7.l 1,000-cscie fatime test (for aualification onlsl*- Percent water absorp
33、tion after exposure to a 1,000-cycle fatigue testahall be obtained after exposure to the following fatigue cycle: (a) Expose 1-inch diameter b 2-inches long test specimens to test liquid at 75 t. 10 K . for 10 seconds. Wipe specimen dry in a paper towel and immediately weigh to the nearest milligram
34、, E-ose specimens for 1,000 cycles in the test liquid in accordance with the following test cycle: 4. minute rise in hydrostatic pressure: 1, From atmospheric to 4,500 p.s.i.g. for type I only. From atmospheric to 10,000 p.s.i.g. for type II only, 4,500 p.s.i.g. for 12 minutes for type I Only. 10,00
35、0 p.s.i.g. for 12 minutes for type II only. 1000 psi so that: 2. Hold pressure at: 3. Release pressure at a rate of approximately 10 seconds/ Pressure is reduced to atmospheric in 45 +,JO seconds Pressure is reduced to atmospheric in 100 +, 20 seconds for type I material only. for type II material o
36、nly. ifold 4 minutes at atmospheric pressure. 4. 5. Repeat for 1,000 cycles. (b) Rmve specimens from the test fluid after completion of the 1,000 cycle tests. Wipe dry in a paper towel and immediately weigh to the nearest milligram. water absorption in accordance wth formula in 4.6.7. Calculate 8 c
37、Licensed by Information Handling ServicesI .- - I r i f 4.6.8 ,Uniaxial compre5sive tests.- One.-inch diameter by 2-inch long test specimens shall be tested in accordance with ASTM D695 to determine the compressive strength, 0.2 percent offset compressive stress, and the compressive modulus. 4.6.9 T
38、ensile strength.- The tensile strength test shall be in accordance with ASTM 0638 using one-half inch thick, type II specimens as described therein. (See 6.4). 4.6.10 Shear strength.- The shear strength shall be determined in accordance with ASTM D732. 4.6.11 Bulk modulus.- This method describes the
39、 procedure for determining the bulk modulus of a syntactic buoyancy material by means of a piston volume displcement method. 4.6.11.1 ADDaratus.- The following apparatus shsll be used. Cylinder and piston (see 6.5) Hydrostatic pressing chamber. I.D. = 21 inches. 0,D. = 44 inches. Working height = 10
40、 inches. Pressure rating = 15,000 p.s.i.g. Tonnage required = 29.8T. Chamber material - AIS1 4340 H.T. to 140,000 p,s.i.,Y.S. Piston seal: . Buna N “0“ ring with teflon backups. 4.6.11.2 Test mecimen.- The size of the test specimen shall be 4 by 4.6.1 1.3 Procedure.- The procedure shall be as follow
41、s: I* by 1s inches (148 rol.). (a) The high grade alloy steel cylinder is partially filled with 500 ml. of .ter (fresh distilled water), gnd a stainless steel.block measuring 4 by 1-1/2 %y 1-1/2 inches (I ml) is inserted into the chamber. The water in the cylinder is then compressed by %e Fiston to
42、4,500 p.s.i.g. on a compression machine for type I and to 10,OOO p.s.i.g. for type II using a rate of cross-head travel of 0.05 in./min. valume of the water is recorded automatically on the machine chart. a recorder). (b) (c) The piston displacement and hence the change in (A dial gage may be used i
43、n lieu of 9 c, Licensed by Information Handling ServicesI 3 MIL-S-24354A73 m 7777906 O338490 2 m MIL-S-2&I 54A( SHIPS) (d) The steel block is removed and the syntactic specimen is introduced into the cylinder with the same volume of water present. subjected to 4,500 p.s,i.g. hydrostatic pressure on
44、the comprcasion machine for type Iand to 10,000 p.s.i.g. for type II using a rate.of cross-head travel of 0.05 in./min. (e) The combination of water and syntactic specimen is also 4.6.1 1.4 Calculations.- Calculations shall be made as follws: (a) (b) The volume change of the syntactic specimen is th
45、en determined by substracthg the compression of the water from the compression. of the combination. A correction is made for water absorption by weighing the specimen before and after exposure. (The weight gain is converted to volume and substracted from the actual AVs below.) (c) The relationship b
46、etween the volume change of water and volume change of the syntactic meteria1 may be expressed in the followkng way: k=-d=-( AV Avc - vs Avw ) vS Where : k = compression. = change in pressure Avs = change in volume of syntactic material (corrected for absorbed water). Avc = change in volume of combi
47、nation, syntactic material aiad water. mw = change in volume of water. Vs = original volume of syntactic material. Where: Bulk modulus is EB = & - V.s AVs 4$6.12 Hydrostatic comwessive strength, - The hydrostatic compressive strength test shall be determined as specified in Appendix A. 4.7 Inspectio
48、n for pre-paration for delivery. - Packaging, packing, and marking shall be inspected to assure compliance with section 5 of this specification. 10 /- I Licensed by Information Handling Servicesfor products which are at the time set for opening of bids, qualified for inclusion in applicable Qualifie
49、d Products List QPL 24.154 whether or not such products have actually been so listed by that date. is called to this requirement, and manufacturers are urged products that they propose to offer to the Federal Government tested for qualification, in order that they may be eligible to be awarded contracts or orders for the products covered by this specification, The activity responsible for the qualified products list is the Naval Ship Engineering Center, Department of the Navy, Washington, D.C. 20360, and information pertaining to qualification of pro
