16.法律服务-投资协议(增资).docx
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1、Designation: E8/E8M16aAmerican Association State Highway and Transportation Officials Standard AASHTO No.: T68 An American National Standard Standard Test Methods for Tension Testing of Metallic Materials1 This standard is issued under the fi xed designation E8/E8M; the number immediately following
2、the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval. This standard has been approved
3、 for use by agencies of the U.S. Department of Defense. 1. Scope* 1.1 These test methods cover the tension testing of metallic materials in any form at room temperature, specifi cally, the methods of determination of yield strength, yield point elongation, tensile strength, elongation, and reduction
4、 of area. 1.2 The gauge lengths for most round specimens are re- quired to be 4D for E8 and 5D for E8M. The gauge length is the most signifi cant difference between E8 and E8M test specimens. Test specimens made from powder metallurgy (P/M) materials are exempt from this requirement by industry- wid
5、e agreement to keep the pressing of the material to a specifi c projected area and density. 1.3 Exceptions to the provisions of these test methods may need to be made in individual specifi cations or test methods for a particular material. For examples, see Test Methods and Defi nitions A370 and Tes
6、t Methods B557, and B557M. 1.4 Room temperature shall be considered to be 10 to 38C 50 to 100F unless otherwise specifi ed. 1.5 The values stated in SI units are to be regarded as separate from inch/pound units. The values stated in each system are not exact equivalents; therefore each system must b
7、e used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appr
8、o- priate safety and health practices and determine the applica- bility of regulatory limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards:2 A356/A356M Specifi cation for Steel Castings, Carbon, Low Alloy, and Stainless Steel, Heavy-Walled for Steam Tur- bines A370 Test Methods and D
9、efi nitions for Mechanical Testing of Steel Products B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products B557M Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric) E4 Practices for Force Verifi cation of Testing M
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