1.1 本试验方法规定了通过固定悬臂、恒定挠度（即恒定位移幅度）型试验机测定铜合金平板或弹簧材料条反向或重复弯曲疲劳性能的要求。该方法仅限于厚度为0.005英寸的平板或带材。至0.062英寸。（0.13 mm至1.57 mm），疲劳寿命范围为10 5. 至10 8. 循环，以及试验期间应力-应变关系没有显著变化的条件。 注1: 这意味着，在测量精度范围内，材料的荷载-挠度特性不会随循环次数而变化。 没有明显的循环硬化或软化。 1.2 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.3 以下安全危险警告仅适用于本试验方法中所述的试验方法。 1.3.1 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、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法中所述的弯曲疲劳试验提供了有关铜合金平板和弹簧材料带材抵抗裂纹发展或一般机械劣化的能力的信息，这些裂纹或机械劣化是由相对大量的循环（通常在10%范围内）引起的 5. 至10 8. )在恒定位移的条件下。 5.2 本试验方法主要是一种研究和开发工具，可用于确定材料变化对疲劳强度的影响，并为在重复应变循环条件下选择铜合金弹簧材料提供数据。 5.3 只有当所有设计因素（如载荷、零件几何形状、应变频率和环境条件）已知时，结果才适合直接应用于设计。由于收集数据所需的时间和精力，该测试方法通常不适用于检验测试或质量控制测试。

1.1 This test method establishes the requirements for the determination of the reversed or repeated bending fatigue properties of copper alloy flat sheet or strip of spring materials by fixed cantilever, constant deflection (that is, constant amplitude of displacement)-type testing machines. This method is limited to flat sheet or strip ranging in thickness from 0.005 in. to 0.062 in. (0.13 mm to 1.57 mm), to a fatigue life range of 10 5 to 10 8 cycles, and to conditions where no significant change in stress-strain relations occurs during the test. Note 1: This implies that the load-deflection characteristics of the material do not change as a function of the number of cycles within the precision of measurement. There is no significant cyclic hardening or softening. 1.2 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 that are provided for information only and are not considered standard. 1.3 The following safety hazard caveat pertains only to the test methods(s) described in this test method. 1.3.1 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. 1.4 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 The bending fatigue test described in this test method provides information on the ability of a copper alloy flat sheet and strip of spring material to resist the development of cracks or general mechanical deterioration as a result of a relatively large number of cycles (generally in the range 10 5 to 10 8 ) under conditions of constant displacement. 5.2 This test method is primarily a research and development tool which may be used to determine the effect of variations in materials on fatigue strength and also to provide data for use in selecting copper alloy spring materials for service under conditions of repeated strain cycling. 5.3 The results are suitable for direct application in design only when all design factors such as loading, geometry of part, frequency of straining, and environmental conditions are known. The test method is generally unsuitable for an inspection test or a quality control test due to the amount of time and effort required to collect the data.