1、NASM 1312-20-1997 Fastener Test Methods, Method 20 single shear_STD.AIA/NAS NASML312-20-ENGL 3777 0338743 0505430 329 NASM13 12-20 29 August 1997 ADOPTION NOTICE NASM1312-20, “Fastener Test Methods Method 20 Single Sheaf was adopted on 29 August 1997 for use by the Department of Defense OD). Propose
2、d changes by DoD activities must be submitted to the DoD Adopting Activity: Commander, Naval Air Warfare Center Aircraft Division, Code 414100B 120-3 Highway 547, Lakehurst, NJ 08733-5 100. DoD activities may obtain copies of this standard fiom the Standardization Document Order Desk, 700 Robbins Av
3、enue, Building 4D, Philadelphia, PA 191 11-5094. The private sector and other Government agencies may purchase copies from the Aerospace Industries Association, 1250 Eye Street W, Washington, DC 20005. NASM13 12-20 Should be used instead of MIL-STD-13 12-20, which was cancelled on 29 August 1997. Cu
4、stodians: Navy - AS Air Force - 1 1 Army - AV Preparing activity: Navy - AS (Project No. 53GP-0285-20) Review Activities: Navy - AS, SH Air Force - 1 1 Army - AV, AR DLA - IS COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Servicest !NASM1312-20
5、STGW PRACTICE ,. FASTENER TEST METHODS METHOD 20 SINGLE SHEAR THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MIL-STD-13 12-20 DESIGNATION FOR THIS TEST METHOD REMAINS MIL-STD-13 12-20 FSC 53GP SHEET 1 OF 14 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS
6、 ENTIRELY VOLUNTARY AIA DOES NOT QUALIIV SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTINO (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK R
7、IGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Services STD.AIA/NAS NASML3L2-2O-ENGL L997 0338743 0505374 594 I NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED I4 ,I , , , NA
8、SM13 12-20 !I i 1 , ny II ,ln I FOREWORD ., This standard sets forth a standard test method to define the procedure and apparatus for testing fasteners in single shear, I 4, I, SHEET 2 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA
9、 DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerosp
10、ace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Servicesi NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED ,I , I, NASM 13 12-20 :1 1 py J , ;n I TABLE OF CONTENTS 1. 1.1 2. 2.1 2.1.1 2.2 3. 4. 4.1 4
11、.1.1 4.1.2 4.1.2.1 4.1.2.2 5. 5.1 6. 6.1 Fimre la. Ib. 2a. 2b. 3a. 3b. Sheet SCOPE . . 5 Applicability . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,. . . . . . . . . . . . .5 REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . , . . .
12、. . . . . . . . . . . . . . . . . . . . . .5 Government documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .: . . . . . . . . . . , . 5 Specifications, standards and handbooks . . . . . . 5 Other publications . . . . . . . . 5 DEFINITIONS . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,. . . . . . . . . . . . . . . . . . . . . . . . . .5 GENERAL REQUIREMENTS . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Test apparatus . . . . . . . . . . . . . . . . . .
14、 . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Testing machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . , . . . . . . . . . . .
15、. . . . . . .6 Test fixtures . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . .6 Test plate . . . . . . . . . . , . , . . . . , . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . , . . . . . . . . . . . . . . .6 Holding fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 DETAIL REQUIREMENTS . . . . . . . , . . , . . . . . . . . . . . . . . . . .
17、 . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . .6 Test procedures . . . . . . . . . . . . . , . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 NOTES . . . , . , . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , .8 FIGUR
19、ES I I. I Sheet Test fixture assembly and set-up . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . .9 Shear test fixture details . . 10 Test fixture assembly . . 1 1 Shear test fixture details . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Shear fixture assembly . 13 Shear test fixture details . . 14 I. I. SHEET 3 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA D
21、OES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATlON OR (2) THE EXISTENCE OF OR APPLICABILlTy THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospac
22、e Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Servicesi NATIONAL AEROSPACE STANDARD COPYRIOHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, MC ALL RIGHTS RESERVED I , 1 I , NASMl3 12-20 Il i 6 I # J ,:II I I TABLES Table Sheet I. Single shear load rates ., .
23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 I d. I, SHEET 4 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER
24、AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CWM RESPECTING (1) THE SUITABILITY OF lTEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information
25、Handling ServicesSTD.AIA/NAS NASML332-20-ENGL L777 I 0338743 0505377 2T3 I i . NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED t . , NASMl3 12-20 y i 1, ) #:U 1. SCOPE 1.1 Applicabilitv. This test method outlines the procedure and appar
26、atus for testing fasteners in single shear. I 1.2 While this method primarily is for testing fasteners that cannot be tested in double shear, if used for those fixture types and lengths amenable to double shear testing, the double shear test is considered the referee method. 2. REFERENCED DOCUMENTS
27、2.1 Government documents. 2.1.1 Specifications. standards and handbooks. Unless otherwise specified, the following specifications, standards and handbooks of the issue listed in the current Department of Defense Index of Specifications and Standards (DoDISS) and the supplement thereto (if applicable
28、), form a part of this standard to the extent specified herein. STANDARD MILITARY MIL-STD-45662 Calibration System Requirements (Copies of specifications, standards, handbooks, drawings and publications required by contractors in connection with specific acquisition hnctions should be obtained fiom
29、the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following document) forms a part of this specification to the extent specified herein. The issue of the documents which are indicated as DOD adopted shall be the issue in the current,DoDISS and the suppl
30、ement thereto, if applicable. , AMERICAN SOC1ETY FOR TESTING AND MATERIALS (ASTM) . 1. 1 I. J; i 1 II ASTM E 4 Load Verification of Testing Machines (Applications for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) 3. DEFINITIO
31、NS Not applicable. SHEET 5 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE WON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAlM RESPECTING (1) THE SUITABI
32、LITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Servicesi NATIONAL AEROSPACE STANDARD OCOPYRIOHT 1997 AEROSPACE INDUSTFUE
33、S ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED ,I , I , 4 I ., NASMl3 12-20 y 1 I py J I.4 4. GENERAtkE(IWREMENTS 4.1 Test apparatus. 4.1.1 TestinP machine. The testing machine shall be capable of applying a compressive load at a controllable rate. The machine shall conform to the requirements of
34、 MIL-STD-45662. Its accuracy shall be verified every six months by a method complying with ASTM E 4, using a calibration device which shall have been calibrated by the National Bureau of Standards not more than two years prior to its use. The loads of the fasteners tested shall be within the loading
35、 range of the testing machine as defined in ASTM E 4. 4.1.2 Test fixtures. 4,1.2.1 Test plate. The test plates shall be as shown in Figures 1,2, 3 or equivalent. Plates must maintain the following essential properties: a. The hole diameter for installation formed fasteners, shall be as specified in
36、the product specification or (D + 0.001) + 0.002 - 0.000, where D is the maximum fastener shank diameter for cylindrical body fasteners. b. The hole shall be perpendicular to the test plate within fifteen minutes of arc. c. The hole shall be radiused at one end to provide clearance between fastener
37、head and shank fillet. d. The hole shall be chamfered or broken 0.005/0.010 in the shear plane. e. Unless specified otherwise the width of the shear blade at the fastener contact area shall be 1/2 D + 0.010 - 0.000. 4.1.2.2 Holding; hiure. The holding fixture shall be equivalent to Figureslli h or 3
38、. Fixtures shall be capable of providing shear loading while preventing rotation of the fastener. Shear loading shall remain perpendicular to the longitudinal axis of the fastener throughout the complete test. I 5. DETAIL REQUIREMENTS 5.1 Test procedures. The ultimate single shear strength shall be
39、obtained as follows: a. Fasteners shall be installed in the test plates in accordance with the recommendations SHEET 6 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUC
40、ED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CWM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Inf
41、ormation Handling Servicesi NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, MC ALL RIGHTS RESERVED (i ,I , , NASM1312-20 py ,*U of the manufacturer, using approved installation equipment. Unless specified otherwise, no preload shall be used, except where such
42、preload is a necessary consequence of fastener installation. I b. The specimen shall be installed in the jig and placed between the compression heads of the testing machine. When hydraulic testing machines are used, care shall be exercised to locate the jig at the center of the piston. Caution shoul
43、d be exercised to prevent excessive preload. It is recommended that the preload nuts be torqued to 2 in./lbs maximum. c. The test load is then applied at a uniform load rate as specified in Table I. The ultimate strength is determined by increased deformation of the specimen without increased load.
44、Load rates for oversized fasteners (including blind bolts) shall be the same as for normal size fasteners of the corresponding nominal size. Load rates for larger or smaller size fasteners shall be calculated as 100,000 pounds per minute per square inch of nominal shear area. A tolerance of f10 percent shall apply on the load rate. Nominal shear area is equal to the nominal shank area for load rate calculation only. TABLE I. Single shear load
