1.1 本试验方法涵盖与平行于面层的平面的剪切变形相关的夹层结构芯材剪切性能的测定。它包括平行于夹层平面的剪切强度的测定，以及与垂直于面板的平面内的应变相关的剪切模量。该试验可在直接粘结到加载板的芯材或粘结到加载板的夹层板上进行。允许的芯材形式包括具有连续粘合表面的芯材（如软木和泡沫）以及具有不连续粘合表面的芯材（如蜂窝）。 1.2 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.2.1 在文本中，英寸-磅单位显示在括号中。 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）。本标准的用户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（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 芯剪切特性是夹层板设计中使用的基本特性。该试验方法提供了夹芯结构或芯在平行于面板平面的剪切载荷下的力-挠度行为的信息。 根据完整的力-挠度曲线，可以计算任何力下的岩芯剪应力（例如比例极限、屈服或最大力下的剪应力），并计算有效岩芯剪切模量。 5.2 该试验不会产生纯剪切，但规定了试样长度，以使二次应力的影响最小。也可以从三明治弯曲试验中获得近似的剪切性能（见试验方法 C393 ). 5.3 本试验方法为获得材料规范、夹层板设计、研发应用和质量保证的夹层芯剪切数据提供了标准方法。 5.4 因此，应报告影响芯剪切强度的因素包括:饰面材料、芯材料、粘合材料、材料制造方法、芯几何形状（密度、细胞大小、方向等）、粘合厚度、样本几何形状和相关测量精度、样本制备、样本调节、测试环境、，试样对齐、加载程序、测试速度和粘合剂孔隙含量。 此外，在具有相同芯材和饰面材料的夹芯板中，预固化/粘结和共固化饰面之间的芯材至饰面强度可能不同。

1.1 This test method covers the determination of shear properties of sandwich construction core materials associated with shear distortion of planes parallel to the facings. It covers the determination of shear strength parallel to the plane of the sandwich, and the shear modulus associated with strains in a plane normal to the facings. The test may be conducted on core materials bonded directly to the loading plates or the sandwich facings bonded to the plates. 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 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 The core shear properties are fundamental properties that are used in the design of sandwich panels. This test method provides information on the force-deflection behavior of sandwich constructions or cores when loaded in shear parallel to the plane of the facings. From a complete force-deflection curve, it is possible to compute core shear stress at any force (such as the shear stress at proportional limit, at yield, or at maximum force) and to compute an effective core shear modulus. 5.2 The test does not produce pure shear, but the specimen length is prescribed so that secondary stresses have a minimum effect. Approximate shear properties can also be obtained from a sandwich flexure test (see Test Method C393 ). 5.3 This test method provides a standard method of obtaining sandwich core shear data for material specifications, sandwich panel design, research and development applications, and quality assurance. 5.4 Factors that influence core shear strength and shall therefore be reported include the following: facing material, core material, adhesive material, methods of material fabrication, core geometry (density, cell size, orientation, and so forth), adhesive thickness, specimen geometry and associated measurement accuracy, specimen preparation, specimen conditioning, environment of testing, specimen alignment, loading procedure, speed of testing, and adhesive void content. Further, core-to-facing strength may be different between precured/bonded and co-cured facings in sandwich panels with the same core and facing material.