1.1 这些试验方法包括锻造和铸造铝和镁合金产品的拉伸试验，铝箔除外 2. ，由试验方法得出 E8M ，涵盖所有金属材料的张力测试。 注1: 这些公制测试方法等同于测试方法中的测试方法 B557 ，并且在技术内容上兼容，但圆形试样需要更长的标距。 注2: 可能需要在特定材料的单独规范或试验方法中对这些试验方法的规定进行例外。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 4.1 拉伸试验提供了材料在单轴拉伸应力下的强度和延展性信息。 在某些情况下，这些信息可能有助于材料比较、合金开发、质量控制和设计。 4.2 从零件或材料的选定部分加工成标准尺寸的试样的拉伸试验结果可能并不完全代表整个最终产品的强度和延展性或其在不同环境中的使用行为。 4.3 这些测试方法被认为是令人满意的商业货物验收测试，并已在贸易中广泛用于此目的。

1.1 These test methods cover the tension testing of wrought and cast aluminum- and magnesium-alloy products, excepting aluminum foil 2 , and are derived from Test Methods E8M , which cover the tension testing of all metallic materials. Note 1: These metric test methods are the equivalents of those in Test Methods B557 , and are compatible in technical content except for the requirement of longer gage lengths for round specimens. Note 2: Exceptions to the provisions of these test methods may need to be made in individual specifications or test methods for a particular material. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 4.1 Tension tests provide information on the strength and ductility of materials under uniaxial tensile stresses. This information may be useful in comparisons of materials, alloy development, quality control, and design under certain circumstances. 4.2 The results of tension tests of specimens machined to standardized dimensions from selected portions of a part or material may not totally represent the strength and ductility properties of the entire end product or its in-service behavior in different environments. 4.3 These test methods are considered satisfactory for acceptance testing of commercial shipments and have been used extensively in the trade for this purpose.