1、C i t MIL-W-87127 (USAF) AMENDMENT 1 6 April 1981 .i MILITARY SPECIFICATION WEBBING, TEXTILE, TUBULAR, P.ARA-WD, INTERMEDIATE MODULUS - This amendment forms a part of Military Specification MIL-W-87127 (USAF) , 17 May 1978. PAGE 9 TABLE IV, Column 3, line 7: Add “3/“. - After footnote 2/: design as
2、specified in 4.4.1 through 4.4.1.4. test values, the higher values obtained with either the double pin jaws or the split drum jaws, separately, are acceptable.“ Add “3/ Testing may be done using double ph jaw In case of dispute of Add the following new paragraphs: “4.4.1 Double pin and jaw design. 4
3、.4.1.1 Alternate jaw design. The alternate jaw design is identi- fied as the double pin jaws of the design specified in Figures 1 through 7, 4.4.1,2 Machine adjustment. Mount the jaws with careful attention to rotational and axial alignment. Set the speed of the moving jaw at 15 1/4 inch per minute
4、and the initial jaw separation such that the distance between the tangent points where the specimen first touches the primary (large diameter) pins is 12 t 0.1 inch. 4.4.1.3 Specimen size and number. width of the tape or webbing and 60 inches long. Test five specimens or enough to get five acceptabl
5、e breaks. defined as one which occurs in the unsupported length of the speci- men between the primary pin tangent contact points or at the contact points, but not within the material which is wrapped around each double pin jaw. Each specimen shall be the full An acceptable break is 4-4.1.4 Specimen
6、mountinq. Wrap the specimen around the primary and secondary pins of each jaw as shown in Figure 8. Be careful to keep all legs of the specimen in alignment with the direction of stress application, and successive wraps exactly in line, For materials having a strength less than 500 lbs./inch of widt
7、h, or for stronger materials which are not breaking acceptably, insert a double layer of cotton fabric (Cloth, Silesta, Cotton, MIL-C-326) FSC-8305 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-87127 (USAF) . AMENDMENT 1 between the two layer
8、s of Kevlar which pass around the primary pin in both top and bottom jaws.“ Add Figures 1 through 8. Cus t od ian : Air Force - 11 Preparing Activity: Air Force - 11 (Proj ect 83054764) i . Page 2 of 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
9、-11 BORE FOR PRESS FIT OF 3/4 PIN NOMINAL , I 3 .I2 I NOIES : - 1. Bore holes in sets to ensure . hole al iyniiient. 2. Heat-treat 3f4 D pin before boring. 3. Minimum interference-fit between pin and hole - .O01 pep ihch dia. 4. Type 303 stainless steel - material. ., 5. Quantity requi red - 4. 6. D
10、imensions are in inches. Tolerances: fractions + 1/64, decimals - + .005, and angles 5 1/4“. Deburr and break all edgesto .O05 maximum. Concentricity on common diameter: within .O03 tir. All surfaces to be machined to mis of 125. Threads are class 2. Normality, squareness, and parallelism of all sur
11、faces to be within .O05 per inch ta maximum of .O10 per surface. _- - . c. i. FIGURE 1. Side plate. Page 3 of 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. -I* a o Cu * ,* ma *WW oaa P LZ I I. I I 1 FIGURE 2. Primary pin. Page 4 of 10 T Provid
12、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-W-87127 13 83 999770b O448333 3 O I- I- lu L QI .c ! I T 1 FIGURE 3. Secondary pin -. - Page 5 of 10 . . . .; . . . ,-. Provided by IHSNot for ResaleNo reproduction or networking permitted without license
13、 from IHS-,-,-MIL-W-87127( USAF) AMENDMENT 1 . n c a L 1 a e I li FIGURE 4. Attachment pin. Page.6 of 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-, - - MIL-W-87L27 1) 83 m 7779706 0448335 7 m HIL-W-87127(USAF) MkbHErUT 1 I-. L I FIGURE 5. Atta
14、chment block. Page 7 of 10 I o. ZiNm Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-W-87127 CL3 83 E 9999906 0448336 9 m MIL-W-87127( USAF) AT4ENDMENT 1. . .- -I c Q B L . ,- - f L FIGURE 6. Instron connector pin. Page 8 of 10 .- Provided by IH
15、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-W-7L27 1) 3 sl 9999906 0448337 O m El1 L-W-87 27 ( USAF 1 AMENDMENT 1 THREAD PIN INTO BLOCK BOTTOM THREADS AND BACK OUT TO ATTAIN HOLE AS SHOWN ! NOTES : I 1. Press side plates on to pins to attain specified sep
16、aration. 2. Ends of pins should be flush with outside surface of side plates after pressing . 3. Pins must be parallel, side plates must be parallel and pins must be perpendicular to side plates after pressing. 4, See Figure 1 , Note 6. Double pin jaw - assembly. FIGURE 7. Page 9 of 10 - - - 7 Y* /
17、- - - - _- - - _- _- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-r MIL-W-87L27 13 83 9999906 0448338 2 I41 L-W-87127 (USAF) AMENDMENT i UPPER JAY TO UNIVERSAL AND LOAD CELL PRIMARY PIN SECONDARY PIN GAUGE 1 *“ LENGTH . SPECIHEN I LOWER JAW TO CROSSHEAD -i . . .- _ FIGURE 8. .Test configuration for double pin jaw, : :r I .- *. Page 10 of 10 *U& GOVERNMENT PRINTING OFFICE: 1981-709-023/2428 /,- Y. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
