1、NASM 1312-6-1997 紧固件试验方法6 硬度_NASMl3 12-6 29 August 1997 ADOPTION NOTICE NASM13 12-6, “Fastener Test Methods Method 6 Hardness” was adopted on 29 August 1997 for use by the Department of Defense OD). Proposed changes by DoD activities must be submitted to the DoD Adopting Activity: Commander, Naval A
2、ir Warfare Center Aircraft Division, Code 4141OOB120-3 Highway 547, Lakehurst, NJ 08733-5100. DoD activities may obtain copies of this standard from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 1 1-5094. The private sector and other Government agenci
3、es may purchase copies fiom the Aerospace Industries Association, 1250 Eye Street W, Washington, DC 20005. NASM13 12-6 Should be used instead of MIL-STD-13 12-6, which was cancelled on 29 August 1997. Custodians: Navy - AS Air Force - 11 Army - AV Preparing activity: Navy - AS (Project No. 53GP-0285
4、-06) 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 COPYRIOHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERlCq MC ALL RIGHTS RESERVED NASM
5、l312-6 STANDARD PRACTICE FASTENER TEST METHODS METHOD 6 HARDNESS Aerospace Industries Association THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MIL-STD- 13 12-6 DESIGNATION FOR THIS TEST METHOD REMAINS MIL-STD-1312-6 LIST OF CURRENT SHEETS NO. NEW NEW NEW NEW NEW NEW NEW NEW NEW NEW REV. 10 9 8 7
6、6 5 4 3 2 1 FSC 53GP SHEET 1 OF 10 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 REPRESENTAVON OR CLAIM RESPECTING (1) TH
7、E SUlTABlLITY 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 ServicesSTD.AIA/NAS NASM3332-b-ENGL 1997 .I 0338743 05D50L7 05T
8、NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED NASM-13 12-6 FOREWORD This standard sets forth a standard test method to determine the hardness of all types of structural fasteners. SHEET 2 APPROVAL DATE AUGUST1997 USE OF OR RELIANCE UP
9、ON 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 RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR A
10、PPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, MC ALL RIGHTS RESERVED NASM-13 12-6 TABLE OF CONTE
11、NTS Paragraph 1 1.1 2 . 3 . 4 . 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.2 4.2.1 4.2.2 4.2.3 4.2.4 5 . 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.1.6 6 . 6.1 Table I . SCOPE . 4 . Applicablllty . 4 REFERENCED DOCUMENTS . 4 DEFINITIONS . 4 GENERAL REQUIREMENTS . 4 Test apparatus . 4 Rockwell hardness teste
12、r . 4 Rockwell superficial hardness tester . 4 Micro hardness tester . 4 Calibration . 4 Condition of indenter . 5 Micrometer microscope . 5 General . 5 Surface condition . 5 Flatness . 5 Mounted specimens . 5 Test specimens . 5 DETAIL REQUIREMENT . 7 Test procedures . 7 Choice of scale . 7 Specimen
13、 . 7 Number ofimpressions . 7 Location of impressions . 7 Rockwell hardness and Rockwell superficial hardness . 7 Micro hardness . 8 NOTES . 9 Test reports . 9 Recommended standard hardness test for fasteners . 6 SHEET 3 APPROVAL DATE AUGUST1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE
14、 STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS . AIA MAKES NO REPRESENTATION OR CLAIM RESPECTINO (I) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT O
15、R TRADEMARK RIGHTS . COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC ALL RIGHTS RESERVED NAS” 13 12-6 1. SCOPE 1.1 Applicabilitv. This test method
16、covers a procedure for testing fastener hardness. This method is applicable to all types of structural fasteners: single and multiple piece, blind, threaded and nonthreaded. 2. REFERENCED DOCUMENTS Not applicable. 3. DEFINITIONS Not applicable. 4. GENERAL REQUIREMENTS 4.1 Test apparatus. 4.1.1 Rockw
17、ell hardness tester. This instrument measures an increase in depth of penetration fiom a minor to a major load. Two combinations of indenter and major load are recommended. The B scale utilizes a 1/16-inch ball penetrator with a major load of 100 kilograms. A diamond brale (a spherical-tipped conica
18、l diamond of a 120-degree angle and 0.2-millimeter tip radius), with a major load of 150 kilograms, is required for the-C scale. 4.1.2 Rockwell superficial hardness tester. The superficial hardness tester is similar to the instrument specified in 4.1.1, except that the indentation is much shallower.
19、 The 30T scale utilizes a 1/16-inch ball penetrator with a major load of 30 kilograms, while the 30N scale utilizes the diamond brale with a 30-kilogram load. 4.1.3 Micro hardness tester. A micro hardness tester shall be used when the size or configuration of the test piece does not permit testing o
20、n the Rockwell (normal or superficial) equipment. It shall be used also for molded specimens (where dial gage hardness is subject to the errors of unrecovered vertical motion of the specimen upon release of the major load), or where variation of hardness in small distances is being investigated. The
21、 penetrator is a diamond square pyramid with a face angle of 136 degrees (diamond pyramid hardness PH) or a diamond rhombus pyramid with 172 degrees included angle (hoop). 4.1.4 Calibration. Each tester shall be calibrated with standard test blocks for the applicable testing scales in use and the te
22、st results recorded on a daily basis during tester usage. Calibration cards shall be available at the machines. Minimum distance between the impressions during calibration shall be in accordance with 5.1.4. SHEET 4 APPROVAL DATE AUGUST1997 USE OF OR RELIANCE WON THIS DOCUMENT OR ANY AEROSPACE STANDA
23、RD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CWM RESPECTMG (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK
24、 RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA MC ALL RIGHTS RESERVED NAS 13 12-6 4.1.5 Condition of indenter. Indenters shall be periodicall
25、y checked under a microscope for defects. Flattening of steel ball indenters or cracking and chipping of diamond indenters results in error in the hardness numbers. 4.1.6 Micrometer microscope. For micro hardness testing, a micrometer microscope is required. This instrument shall be so constructed t
26、hat the length of the diagonals of an impression in a properly surface-finished specimen can be measured to within *0.0005 millimeter or *OS percent, whichever is larger. 4.2 Test specimens. 4.2.1 General. The part will be sectioned with parallel surfaces of the specimen prepared by filing, sanding,
27、 grinding, or polishing or a combination thereof as specified and tabulated in table I. Care shall be taken so as not to overheat or work-harden the surface. 4.2.2 Surface condition. For the greatest accuracy, the surface of the specimens should be flat, normal to the axis of the indenter, and repre
28、sentative of sound metal. Plating, scale, paint, or grease shall be removed and the part should be sanded or sectioned. The better the surface condition, the more reliable the hardness reading. The more shallow the indentation, the more critical the surface condition. 4.2.3 Flatness. Wherever possib
29、le, the unmounted specimen shall be machined or ground to obtain two flat, parallel (within 3 degrees) surfaces. Hardness readings are taken on one of the two flat surfaces. Sufficient material shall be removed from this surface to eliminate surface effects such as decarburization, plating, oxides,
30、surface irregularities, or a shear edge. Mer surface preparation, the specimen shall be a minimum of ten times as thick as the depth of the impression to avoid an anvil effect. 4.2.4 Mounted specimens. Parts that cannot be machined with two parallel surfaces (because of size or configuration) shall
31、be imbedded in a thermosetting or thermoplastic material and prepared by sanding and polishing. Precautions shall be taken to ensure parallel (within 1 degree) surfaces . of the mount so that symmetrical indentations are obtained. SHEET 5 APPROVAL DATE AUGUST1997 USE OF OR RELIANCE UPON THIS DOCUMEN
32、T OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF KEMS 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 THE
33、RETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling ServicesSTD.AIA/NAS NASM3332-h-ENGL 1997 D 0338743 U505023 580 M NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, MC ALL RI
34、GHTS RESERVED NAS” 13 12-6 TABLE I. Recommended standard hardness test for fasteners. SHEET 6 APPROVAL DATE AUGUST1997 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 STANDAR
35、DS. 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 Aerospace Industries Association of America, Inc. (AIA NAS)Licensed by Information Handling Servic
36、esSTD.AIA/NAS NASPlL3LZ-b-ENGL LY? 0338743 0505022 417 NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA. INC ALL RIGHTS RESERVED NAS 13 12-6 5. DETAIL REQUIREMENTS 5.1 Test procedures. 5.1.1 Choice of scale. Select a suitable scale (see table I) and use the prop
37、er load and penetrator. The largest load shall be used that is consistent with the dimensions of the specimen and with the maximum allowable size of impression for the indenter. 5.1.2 Specimen. All hardness tests shall be made on a single thickness of the material. 5.1.3 Number of impressions. Size
38、of specimen permitting, four impressions shall be made on each specimen and the first impression should be disregarded. Each of the remaining readings and the averages should be recorded. 5.1.4 Location of impressions. The minimum distance between the center of the impression and the edge of the spe
39、cimen shall be equal to 2-1/2 times the diameter (or the diameter of the enclosing circle) of the impression. There shall be a minimum distance of 5 diameters between centers of the impressions made with a ball penetrator, and at least 2-1/2 diameters between centers made with a conical or pyramidal indenter. For impressions made with a Knoop indenter, the minimum distance from the center of the impression and edge and between centers shall be two times the length of the minor axis. 5.1.5 Rockwell hardness and Rockwell
