1.1 该试验方法确定夹层结构在平行于夹层面板平面的方向上的开孔抗压强度。允许的芯材形式包括具有连续粘结表面的芯材（如轻木和泡沫）以及具有不连续粘结表面（如蜂窝）的芯材。 1.2 本试验方法未规定几个重要的试样参数（例如，面板厚度、岩芯厚度和岩芯密度）；然而，可重复的结果要求指定和报告这些参数。 1.3 该方法使用一个扁平的矩形试样，带有一个位于中心的开口通孔，使用稳定夹具在沿边压缩载荷下进行测试。 1.4 该试验方法产生的性能高度依赖于几个因素，包括:试样几何形状、夹层组件材料和尺寸（面板、芯材和粘合剂）、制造方法和边界条件。因此，结果通常不可扩展到其他夹层结构，特别是测试的几何和物理条件的组合。 1.5 该测试方法可用于测试无缺口试样，但应注意防止出现不期望的故障模式，如端部压碎。ASTM试验方法 第364页 或 7249米/7249米 分别为无缺口夹层板抗压强度或长梁弯曲的推荐试验方法。 1.6 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。每个系统中所述的值不一定完全相等；因此，为了确保符合标准，每个系统应独立使用，两个系统的值不得合并。 1.6.1 在文本中，英寸磅单位显示在括号中。 1.7 本标准并不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。 1.8 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 该试验方法为结构设计容许值、材料规范和研发提供了确定夹层板开孔（缺口）强度的标准方法。 5.2 报告部分要求报告可能影响缺口夹层抗压强度的项目； 这些包括以下内容:面板和芯材、芯材密度、单元尺寸和壁厚（如适用）、薄膜粘合剂、材料制造方法、叠层方向精度、面板堆叠顺序和厚度、芯材厚度、试样总厚度、试样几何形状（包括孔径、直径与厚度之比和宽度与直径之比）、，试样制备（尤其是孔）、试样调节、试验环境、类型、试样/夹具对准、温度时间和试验速度。此外，相同材料的预固化/粘结和共固化面板之间的缺口夹层抗压强度可能不同。 5.3 本试验得出的抗压强度可能不等于进行弯曲压缩试验的夹层结构的抗压强度。

1.1 This test method determines the open-hole compressive strength of sandwich constructions in a direction parallel to the sandwich facesheet plane. 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 Several important test specimen parameters (for example, facesheet thickness, core thickness, and core density) are not mandated by this test method; however, repeatable results require that these parameters be specified and reported. 1.3 The method utilizes a flat, rectangular specimen, with a centrally located open through-hole, which is tested under edgewise compressive loading using a stabilization fixture. 1.4 The properties generated by this test method are highly dependent upon several factors, which include: specimen geometry, sandwich component materials and dimensions (facesheet, core, and adhesive), methods of fabrication, and boundary conditions. Thus, results are generally not scalable to other sandwich constructions, and are particular to the combination of geometric and physical conditions tested. 1.5 This test method can be used to test unnotched specimens, but care should be taken to prevent undesirable failure modes such as end crushing. ASTM Test Methods C364 or D7249/D7249M are the recommended test methods for unnotched sandwich panel compression strength or long beam flexure, respectively. 1.6 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. 1.6.1 Within the text, the inch-pound units are shown in brackets. 1.7 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. 1.8 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 This test method provides a standard method of determining the open-hole (notched) strength of the sandwich panel for structural design allowables, material specifications, and research and development. 5.2 The reporting section requires items that tend to influence notched sandwich compressive strength to be reported; these include the following: facesheet and core materials, core density, cell size and wall thickness if applicable, film adhesive, methods of material fabrication, accuracy of lay-up orientation, facesheet stacking sequence and thickness, core thickness, overall specimen thickness, specimen geometry (including hole diameter, diameter-to-thickness ratio, and width-to-diameter ratio), specimen preparation (especially of the hole), specimen conditioning, environment of testing, type, specimen/fixture alignment, time at temperature, and speed of testing. Further, notched sandwich compressive strength may be different between precured/bonded and co-cured facesheets of the same material. 5.3 The compression strength from this test may not be equivalent to the compression strength of sandwich structures subjected to flexural compression testing.