1.1这些试验方法提供了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数值应视为标准。括号中给出的值仅供参考。 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====== 这些测试方法旨在比较受控条件下的相关材料及其保持给定压应力随时间变化的能力。 螺栓法兰上的部分扭矩损失是蠕变松弛的结果。扭矩损失也可能由螺栓伸长、法兰变形和振动引起；因此，获得的结果应与现场结果相关联。经消费者和生产商同意，这些试验方法可作为常规试验。 笔记 1-试验方法B是使用石棉垫片材料开发的，在发布时，没有其他垫片材料的证实数据。 图1松弛计，试验方法A

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 the standard. The values given in parentheses are for information only. 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 ====== 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. FIG. 1 Relaxometer, Test Method A