1、NASM 1312-21-1997 Fastener Test Methods, Method 21_NASMl3 12-2 1 29 August 1997 ADOPTION NOTICE NASM13 12-21, “Fastener Test Methods Method 21 Shear Joint Fatigue Constant Amplitude” was adopted on 29 August 1997 for use by the Department of Defense (DoD). Proposed changes by DoD activities must be
2、submitted to the DoD Adopting Activity: Commander, Naval Air Warfre Center Aircraft Division, Code 414100B120-3 Highway 547, Lakehurst, NJ 08733- 5 100. DoD activities may obtain copies of this standard fiom the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 1
3、91 1 1-5094. The private sector and other Government agencies may purchase copies fiom the Aerospace Industries Association, 1250 Eye Street W, Washington, DC 20005. NASM1312-21 Should be used instead of MI”-1312-21, which was cancelled on 29 August 1997. Custodians: Navy - AS Air Force - 1 1 Army -
4、 AV Preparing activity: Navy - AS (Project No. 53GP-0285-21) Review Activities: Navy - AS, SH Air Force - 11 Army - AV, AR DLA - IS COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD i COPYRIGHT 1997 AEROSPACE IND
5、USTRIES ASSOCIATION OF AMERICA, MC ALLRIGHTS RESERVED . 1 I NASM1312-21 I STd$RD 0. . PRACTICE FASTENER TEST METHODS METHOD 21 SHEAR JOINT FATIGUE CONSTANT AMPLITUDE Aerospace Industries Associa tim THE INITIAL RELEASE OF THISDOCUMENT SUPERSEDES MIL-STD-1312-21 DESIGNATION FOR THIS TEST METHOD REMAI
6、NS MIL-STD- 13 12-2 I I . FSC 53GP SHEET 1 OF 22 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 AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RES
7、PECTMG (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 Information Handling ServicesNATIONAL AEROSPACE STANDARD i COPYRIGHT 199
8、7 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED , j NASM13 12-21 FOREWORD This standard sets forth a standard test procedure for determining the shear joint fatigue of fasteners at room temperature. i I SHEET 2 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR
9、 ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALJFY SUPPLIERS OR CERTIFY CONFORMANCE OF mMS 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
10、OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Services ._ . STD-AIA/NAS NASML3L2-21-ENGL 1997 03187q3 0505207 845 D Paramaph 1 . 1.1 2 . 2.1 2.1.1 2.2 3 . 4 . 4.1 4.1.1 4.1.1.1 4.1.1.1.1 4.1.2 4.1.2.1 4.1.2.1.3 4.
11、1.2.3 4.1.2.4 4.1.3 4.2 4.2.2 4.2.3 4.2.4 4.2.5 4.2.5.1 4.2.5.2 4.2.5.3 4.2.5.4 4.2.6 4.2.6.1 4.2.6.2 NATIONAL AEROSPACE STANDARD . COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA MC ALL RIGHTS RESERVED NASM13 12-21 .I . TABLE OF CONTENTS Sheet SCOPE . 5 Appllcablllty . 5 . REERENCED DOCU
12、MENTS . 5 Government documents . 5 Specifications. standards and handbooks . 5 Other publications . 5 DEFINITIONS . 6 GENERAL REQUIREMENTS . 6 Test apparatus . 6 Fatigue test machine loading system . 6 Calibration . 6 Elastic calibration . 6 Statlc alignment 9 Equipment . 9 Alignment cells . 9 Proce
13、dure . 9 Alignment example . 9 Fixtures., . 12 Test specimens . 12 Method of loading . 12 Preparation . 12 Strip material mechanical properties . 12 Fastener holes . 17 Hole diameter . . 17 . Copntersunk fastener holes . I 17 . Protdding fastener holes . .# :,.l.!b. . 17 Fastener orientation . 17 As
14、sembly . 17 Fastener installation., . 17 Sheet gap . i . 17 . . I Yi .i . I .r, SHEET 3 APPROVAL DATE AUGUST 1997 USE OF OR RELlANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS .
15、AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUlTABlLlTY 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 ServicesN
16、ATIONAL AEROSPACE STANDARD i COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED )I s : NASM1312-21 ,J i i:, I, 18, TABLE OF CONTENTS (Continued) ,M! O(? III Paragraph ! Sheet 4.2.6.3 Fastener head seating . - . 17 5 DETAIL REQUIREMENTS. . . . . . . . . . . . . . . .
17、. . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 5.1 Test procedures . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . ,. . . . . . . . . . . . . . . . . , . . . . . . . . . 17 5.1.1 Installation . . . .
18、 , . . . . . . 18 5.1.2 Test condltrons . . . .,. . . . 18 5.1.2.1 Joint static strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., . . . . . . . . . . . . . . . . . . . . . . .18 5.1.2.2 Load level . . . . . . . . . . . . . . . . . . . . . . . . . . . , . , . . .
19、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 5.1.2.3 Fatigue test type . 18 5.1.2.4 Load ratio . . . . . . . . . . . . . . . . . . . . . . . . . , . . . , . , . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . .18 5.1.2.5 Test speed . . , . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . , . . . . . . . . . . . . . . . . . . . . . . .18 5.1.2.6 Specimen restraints . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 5.1.2.7 Failure . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . , . , . . . , . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . .18 . 6. NOTES. . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . .2 1 6.1 Test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 1 6.2 Preparation of data . . . . . . . . . . . . . . . . . . . . . . . . 22 FIGURES Figure Sheet 1. Elastic calibration devices . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . ,
24、 . . . . . . . . , . . . . . . . . . . . .7 2. Typical load cell circuits. . . . . . . , . . . . . . . . . . . . . . . . . . 8 3. Typical equipment used for checking alignment. . 11 4 Typical alignment cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , .
25、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . .13 5. Lap joint specimen - single shear 100% load transfer . a . 14 6. Specimen detail, low load transfer test specimen joint ., . I. . . . . . . . . , . . . . . . . . . . . . . 15 8. Specimen restraint fixture (flexure pivot/90 offs
26、et) . . . . . . . .1 i. . . .J,. . . . . . . . . . . . . . . . . . . -19 7. Spechen detail, no load transfer test specimen joint. . . . . . ;c .i i.! 1. . . . . . . . . . . . . . 16 11 i . 1 I 9. Specimen restraint fixture (sandwich,type) . . . . . . . , ,. . . . . . . . . . . . . . . . . . . . , .
27、. . . . .20 SHEET 4 APPROVAL DATE AUGUST 1997 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 O
28、R TRADEMARK RIGHTS. USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD . COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOC
29、IATION OF AMERICA, MC ALL RIGHTS RESERVED * NASM1312-21 ,I , 1 .* 1,1 ADplicability. This test method covers the procedure and apparatus required for testing the shear joint fatigue of fasteners at room temperature. 2. REFERENCED DOCUMENTS 2.1 Government documents. 2.1,l Specifications. standards an
30、d 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), form a part of this standard to the extent specified here
31、in. SPECIFICATIONS FEDERAL QQ-A-250/5 Aluminum Alloy Alclad 2024, Plate and Sheet TT-P-1 757 Primer Coating, Zinc Chromate, Low Moisture Sensitivity MILITARY MIL-P-6808 Primer Coating, Zinc Chromate, Process for Application of MIL-T-9046 Titanium and Titanium Alloy, Sheet, Strip and Plate (Copies of
32、 specifications, standards, handbooks, drawings and publications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publicatobs. The following document(s) forms a part of thi
33、s ,$&ation to the extent specified herein. The issues of the documents which are indicated as DODadhpted shall be the issue in the current DoDISS and the supplement thereto, if applicable. I I SHEET 5 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRE
34、LY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED 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. CO
35、PYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD i COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICq INC ALL RIGHTS RESERVED ,I G NASMl3 12-2 I 1 I 1, AMERICAN MY FOR TESTING AND MATERIALS (ASTM) , i 6 I1
36、 ASTM E4 Load Verification of Testing Machines -8 . !* ASTM E8 Metallic Materials, Tension Testing of ASTM E74 Verification of Calibration, Devices for Verifying Testing Machines (Applications for copies should be addressed to the American Society for Testing and Materials, 19 16 Race Street, Philadelphia, PA 19 103 .) 3. DEFINITIONS Not applicable. 4. GENERAL REQUIREMENTS 4.1 Test amaratus. 4.1.1 Fatime test machine loadinp system. The dynamic loading system shall be accurate within *2 percent of the programmed maximum load, for load greater than 10% of the range of the machine. The
