1.1 这些测试方法提供了一种在施加压缩应力后的预定时间测量垫片材料蠕变松弛量的方法。 1.1.1 试验方法A-- 通过螺栓上的校准应变计测量蠕变松弛。 1.1.2 试验方法B-- 通过带千分表的校准螺栓测量蠕变松弛。 1.2 以国际单位制表示的值应被视为标准值。括号中给出的值仅供参考。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、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 这些测试方法旨在比较受控条件下的相关材料及其随时间保持给定压应力的能力。螺栓法兰上的部分扭矩损失是由以下原因造成的 蠕变松弛。 扭矩损失也可能是由螺栓伸长、法兰变形和振动引起的；因此，所获得的结果应与现场结果相关联。当消费者和生产商之间达成一致时，这些测试方法可以用作常规测试。 注1: 试验方法B是使用石棉垫片材料开发的，在发布时，其他垫片材料没有证据数据。

1.1 These test methods provide a means of measuring the amount of creep relaxation of a gasket material at a predetermined time after a compressive stress has been applied. 1.1.1 Test Method A— Creep relaxation measured by means of a calibrated strain gauge on a bolt. 1.1.2 Test Method B— Creep relaxation measured by means of a calibrated bolt with dial indicator. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 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, 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 ====== 4.1 These test methods are designed to compare related materials under controlled conditions and their ability to maintain a given compressive stress as a function of time. A portion of the torque loss on the bolted flange is a result of creep relaxation. Torque loss can also be caused by elongation of the bolts, distortion of the flanges, and vibration; therefore, the results obtained should be correlated with field results. These test methods may be used as a routine test when agreed upon between the consumer and the producer. Note 1: Test Method B was developed using asbestos gasket materials and at issuance substantiating data were not available for other gasket materials.