1.1 该测试方法涵盖了弯曲测试铜和铜合金带材样品的技术，以确定产品的可成形性或在特定半径周围形成弯曲时抗开裂的能力。失效的标准是弯曲凸面上出现裂纹。 1.2 此弯曲试验仅限于0.003的带材 0.031英寸（0.076 mm至0.79mm（包括0.79mm）厚。 1.3 弯曲试验的成形半径或冲压半径应由制造商或供应商与买方协商确定。该冲压半径通常等于或大于被测带材的合金、回火和厚度组合的最小弯曲半径而不会失效。 1.4 单位-- 以英寸表示的值- 磅单位应视为标准单位。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 该弯曲试验提供了关于铜和铜合金带在形成时的可成形性或抗开裂能力的信息。 5.2 这种测试方法可以用作质量控制工具，以确定材料是否会形成给定的半径。 5.3 这种测试方法在研究和开发中也很有用，可以提供数据，用于选择能够安全形成给定零件几何形状的弹簧材料。 5.3.1 感兴趣的成形特征是可以在没有裂纹或其他不可接受的表面条件的情况下形成的最小弯曲半径( 8.4 )。该半径R是测试中使用的冲头鼻部的曲率半径。 5.3.2 此外，测试后弯曲角度与90°之间的差异提供了后- 形成回弹。 5.4 只有当零件的几何形状、冲头和模具设计、润滑、冲压速度和其他材料特性等所有因素都已知时，这些结果才适合直接应用于设计和制造。

1.1 This test method covers the technique of bend testing copper and copper alloy strip samples to determine product formability or the ability to resist cracking when forming a bend around a specific radius. The criterion for failure is the occurrence of cracks on the convex surface of the bend. 1.2 This bend test is limited to strip from 0.003 in. to and including 0.031 in. (0.076 mm to and including 0.79 mm) thick. 1.3 The forming or punch radius for the bend test shall be determined by agreement between the manufacturer or supplier and purchaser. This punch radius is typically equal to or greater than the minimum bend radius without failure for the alloy, temper and thickness combination of the strip being tested. 1.4 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard. 1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This bend test provides information as to the formability or the ability of copper and copper alloy strip to resist cracking when being formed. 5.2 This test method can be used as a quality control tool to determine if material will form to a given radius. 5.3 This test method is also useful in research and development to provide data for use in selecting a spring material that will safely form to the geometry of a given part. 5.3.1 The forming characteristic of interest is the smallest bend radius that can be formed without cracks or otherwise unacceptable surface conditions ( 8.4 ). This radius, R, is the radius of curvature of the nose of the punch used in the test. 5.3.2 In addition, the difference between the angle of the bend after testing and 90° provides a measure of post-forming springback. 5.4 The results are suitable for direct application in design and manufacturing, only when all factors such as the geometry of the part, punch and die design, lubrication, stamping speed, and other material properties are known.