1.1 本试验方法包括通过符合本试验方法中所述要求的冲击和测量装置，在冲击应变和应变速率范围内测定橡胶弹性的方法。 1.2 本试验方法适用于热固性橡胶和热塑性弹性体，在规定的试验温度下，其硬度在30至85 IRHD之间（见试验方法 D1415 )或A/30和A/85（见试验方法 D2240 ). 它也可能适用于一些聚酯、聚醚泡沫和塑料泡沫材料。 1.3 用于确定质量、力或尺寸的所有材料、仪器或设备应可追溯至国家标准与技术研究所或其他国际公认的平行组织。 1.4 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5 本标准并不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====== 4.1 Schob型回弹摆设计用于测量橡胶化合物的回弹百分比，作为滞后能量损失的指示，滞后能量损失也可以由储能模量和损失模量之间的关系来定义。测得的回弹百分比与滞后损耗成反比。 4.1.1 百分比弹性或回弹弹性通常用于聚合物和复合化学品的质量控制测试。 4.1.2 回弹性由自由下落的摆锤确定，该摆锤从给定高度落下，撞击试样并赋予其一定量的能量。其中一部分能量由试样返回到摆锤，并可通过摆锤回弹的程度来测量，由此恢复力由重力确定。 4.1.2.1 由于摆锤的能量与摆锤位移的垂直分量成比例，因此可以表示为1–cos（位移角）和回弹百分比。 RB ，通常称为百分比反弹，由以下方程确定: 4.1.2.2 回弹性可计算为: 哪里 h = 回弹的顶点高度，以及 H = 初始高度。 4. 1.2.3 回弹性也可以通过测量回弹角α来确定。根据回弹角α，根据以下公式获得以百分比为单位的回弹率:

1.1 This test method covers a means of determining the resilience of rubber, within a range of impact strain and strain rate, by means of the impacting and measuring apparatus conforming to the requirements described in this test method. 1.2 This test method is applicable to thermoset rubbers and thermoplastic elastomers, the hardness of which, at the specified test temperatures, lies between 30 and 85 IRHD (see Test Method D1415 ) or A/30 and A/85 (see Test Method D2240 ). It may also be applicable to some polyester, polyether foam, and plastic foam materials. 1.3 All materials, instruments, or equipment used for the determination of mass, force, or dimension shall have traceability to the National Institute for Standards and Technology, or other internationally recognized organization parallel in nature. 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 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 ====== 4.1 The Schob Type rebound pendulum is designed to measure the percentage resilience of a rubber compound as an indication of hysteretic energy loss that can also be defined by the relationship between storage modulus and loss modulus. The percent rebound measured is inversely proportional to the hysteretic loss. 4.1.1 Percentage resilience or rebound resilience are commonly used in quality control testing of polymers and compounding chemicals. 4.1.2 Rebound resilience is determined by a freely falling pendulum hammer that is dropped from a given height that impacts a test specimen and imparts to it a certain amount of energy. A portion of that energy is returned by the specimen to the pendulum and may be measured by the extent to which the pendulum rebounds, whereby the restoring force is determined by gravity. 4.1.2.1 Since the energy of the pendulum is proportional to the vertical component of the displacement of the pendulum, it may be expressed as 1 – cos (of the angle of displacement) and percentage rebound resilience. RB , commonly called percentage rebound, is determined from the equation: 4.1.2.2 The rebound resilience may be calculated as: where: h = apex height of the rebound, and H = initial height. 4.1.2.3 The rebound resilience may also be determined by the measurement of the angle of rebound α. From the rebound angle α, the rebound resilience in percent is obtained according to the following formula: