1.1 本试验方法包括测定夹层芯的抗压强度和模量。这些特性通常是为了设计目的，在垂直于面板平面（也称为面层）的方向上确定的，因为核心将放置在结构夹层结构中。试验程序特别适用于该方向的压缩，但也可以应用于确定其他方向的压缩性能，可能存在微小变化。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 本试验方法不包括抗压芯抗压性能的测定。参考试验方法 D7336/D7336M 用于测定蜂窝夹芯材料的静态能量吸收性能。 1.3 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。 1.3.1 在文本中，英寸-磅单位显示在括号中。 1.4 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。 1.5 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 平面抗压强度和模量是用于设计夹层板的夹层芯的基本机械性能。 可以获得变形数据，从完整的力-变形曲线中，可以计算任何施加力下的压缩应力（例如比例极限力下的压缩应力或最大力下的压缩强度），并计算芯的有效模量。 5.2 本试验方法提供了获得夹层结构设计特性、材料规范、研发应用和质量保证的平面抗压强度和模量的标准方法。 5.3 为了防止某些蜂窝芯的局部破碎，通常需要使用合适的材料（例如树脂薄层或薄表面）稳定面对面平面。 可使用稳定试样（报告为稳定抗压强度）或非稳定试样（报告为裸抗压强度）生成平面抗压强度数据。航空航天行业的惯例是，仅在使用稳定试样时才确定压缩模量。 5.4 因此，应报告影响平面抗压强度的因素包括:芯材、材料制造方法、芯几何形状（细胞大小）、芯密度、试样几何形状、试样制备、试样调节、试验环境、试样对齐、加载程序和试验速度。

1.1 This test method covers the determination of compressive strength and modulus of sandwich cores. These properties are usually determined for design purposes in a direction normal to the plane of the face sheets (also referred to as the facing plane) as the core would be placed in a structural sandwich construction. The test procedures pertain to compression in this direction in particular, but also can be applied with possible minor variations to determining compressive properties in other directions. 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 This test method does not cover the determination of compressive core crush properties. Reference Test Method D7336/D7336M for determination of static energy absorption properties of honeycomb sandwich core materials. 1.3 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. 1.3.1 Within the text, the inch-pound units are shown in brackets. 1.4 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. 1.5 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 Flatwise compressive strength and modulus are fundamental mechanical properties of sandwich cores that are used in designing sandwich panels. Deformation data can be obtained, and from a complete force versus deformation curve, it is possible to compute the compressive stress at any applied force (such as compressive stress at proportional limit force or compressive strength at the maximum force) and to compute the effective modulus of the core. 5.2 This test method provides a standard method of obtaining the flatwise compressive strength and modulus for sandwich core structural design properties, material specifications, research and development applications, and quality assurance. 5.3 In order to prevent local crushing of some honeycomb cores, it is often desirable to stabilize the facing plane surfaces with a suitable material, such as a thin layer of resin or thin facings. Flatwise compressive strength data may be generated using either stabilized specimens (reported as stabilized compression strength) or non-stabilized specimens (reported as bare compression strength). It is customary aerospace industry practice to determine compression modulus only when using stabilized specimens. 5.4 Factors that influence the flatwise compressive strength and shall therefore be reported include the following: core material, methods of material fabrication, core geometry (cell size), core density, specimen geometry, specimen preparation, specimen conditioning, environment of testing, specimen alignment, loading procedure, and speed of testing.