1.1 本试验方法包括测定各种类型的夹层结构芯材在浸入水中或处于高相对湿度环境时的相对吸水量。允许的芯材形式包括具有连续粘合表面的芯材（如巴杉木和泡沫）以及具有不连续粘合表面（如蜂窝）的芯材。 1.2 以国际单位制或英寸-磅单位表示的值应单独视为标准值。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。将两个系统的值结合起来可能会导致不符合标准。 1. 2.1 在文本中，英寸-磅单位显示在括号中。 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====== 5.1 吸收的水会影响夹层芯材料的特性，如电性能（例如介电常数、损耗角正切和电阻）和机械性能（例如强度和模量）。 吸收的水的质量也可能影响夹层结构的行为。应注意的是，在夹芯板中，芯材两侧粘合的饰面可能会影响芯材吸收的水量。 5.2 该测试方法提供了一种获得夹层芯吸湿数据的标准方法，用于设计性能、材料规格、研发应用和质量保证。 5.3 因此，应报告的影响吸水率的因素包括:芯材、材料制造方法、芯几何形状（蜂窝孔尺寸、蜂窝孔壁厚、泡沫孔径等）、试样几何形状、试样制备、质量和尺寸测量方法、试样调节以及质量和尺寸测量过程中的含水量。

1.1 This test method covers the determination of the relative amount of water absorption by various types of sandwich construction core materials when immersed in water, or when subjected to a high relative humidity environment. Permissible core material forms include those with continuous bonding surfaces (such as balsa wood and foams) as well as those with discontinuous bonding surfaces (such as honeycomb). 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.2.1 Within the text the inch-pound units are shown in brackets. 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 ====== 5.1 Absorbed water affects the characteristic properties of sandwich core materials, such as electrical properties (for example, dielectric constant, loss tangent, and electrical resistance) and mechanical properties (for example, strength and modulus). The mass of absorbed water may also affect the behavior of sandwich structures. It should be noted that in a sandwich panel the presence of facings bonded on two sides of the core may affect the amount of water absorbed by the core. 5.2 This test method provides a standard method of obtaining sandwich core moisture absorption data for design properties, material specifications, research and development applications, and quality assurance. 5.3 Factors that influence the water absorption and shall therefore be reported include the following: core material, methods of material fabrication, core geometry (honeycomb cell size, honeycomb cell wall thickness, foam pore size, etc.), specimen geometry, specimen preparation, methods of mass and dimensional measurement, specimen conditioning, and moisture content during mass and dimensional measurements.