1.1 当试样在不同水平的静载荷、恒定温度和相对湿度下受到剪切应力时，本试验方法涵盖了木材与木材粘合中结构粘合剂随时间变化特性的测定。提供了用于在静态载荷下直接测量与时间相关的剪切变形（蠕变）和粘合剂粘结失效时间的设备和程序。给出了选择试验条件的指南、计算蠕变速率、蠕变应变、蠕变模量和失效时间外推法的方法，以及提供这些数据的方法。 1.2 以英寸磅为单位的数值应视为标准。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。 1.3 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。 1.4 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 在这种测试方法中，在相对较短的时间内获得的蠕变数据可以提供粘合剂在相对较长的时间内承受剪切静态载荷的能力的测量。蠕变测量是在一系列预期使用条件下进行的，包括应力水平、温度、相对湿度和负载持续时间。计算了各种使用条件下的蠕变速率、蠕变应变和蠕变模量。 4.2 蠕变数据可用于( 1. )预测粘合剂在长期负载下的性能( 2. )表征粘合剂( 3. )将粘合剂相互比较并对照规范进行比较，以及( 4. )设计使用粘合剂制造的结构构件。 4.3 失效时间数据提供了在不同应力、温度和相对湿度水平下，作为时间函数的粘合剂的极限承载能力的测量。 4.4 在适当谨慎的情况下，可以推断出从相对较短的加载时间得出的失效时间数据，以估计粘合剂在静应力工作水平下的使用寿命。此属性也可以与蠕变数据一起使用，以实现中列出的目的 4.2 . 4.5 该测试方法是一种研究工具，旨在开发或评估新型粘合剂和新产品设计。研究人员可以从建议的测试中选择合适的测试。然而，蠕变和失效时间测试是非常规的，可能耗时且昂贵，因此必须谨慎选择测试。 4.6 该仪器和程序可能适用于测量木材以外基材（如金属、塑料和玻璃）上粘合剂的蠕变性能，但这些考虑因素不在本试验方法的范围内。

1.1 This test method covers the determination of time-dependent properties of structural adhesives in wood-to-wood bonds when specimens are subjected to shearing stresses at various levels of static load, constant temperature, and relative humidity. Apparatus and procedures are provided for direct measurement of time-dependent shear deformation (creep) and time to failure of adhesive bonds under static load. Guidelines for selecting test conditions, methods for calculating creep rate, creep strain, creep modulus, and extrapolation of time to failure, are given along with methods of presenting these data. 1.2 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 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 Creep data that are obtained over a relatively short period of time in this test method can provide a measure of an adhesive bond's ability to withstand static loading in shear over a relatively long period of time. Creep measurements are made over a range of expected service conditions, including level of stress, temperature, relative humidity, and duration of load. Creep rate, creep strain, and creep modulus are calculated at the various service conditions. 4.2 Creep data can be used to ( 1 ) predict performance of an adhesive under long-term loading, ( 2 ) characterize an adhesive, ( 3 ) compare adhesives with each other and against specifications, and ( 4 ) design structural members fabricated with an adhesive. 4.3 Time-to-failure data provide a measure of the ultimate load-carrying ability of an adhesive bond as a function of time at various levels of stress, temperature, and relative humidity. 4.4 With proper caution, time-to-failure data derived from relatively short loading periods can be extrapolated to estimate the useful service life of an adhesive at working levels of static stress. This property may also be used with creep data to accomplish purposes listed in 4.2 . 4.5 This test method is a research tool intended for development or evaluation of new adhesives and new product designs. The researcher may select from suggested tests those that are appropriate. However, creep and time-to-failure tests are nonroutine and can be time-consuming and expensive, so tests must be selected with care. 4.6 The apparatus and procedures may be suitable for measuring creep properties of adhesives on substrates other than wood, such as metal, plastic, and glass, but such considerations are not within the scope of this test method.