1.1 本试验方法涵盖了夹层结构的压缩残余强度财产，这些结构按照实践受到准静态压痕或落锤冲击 D7766/D7766M . 注1: 当用于确定落锤冲击板的残余强度时，该试验方法通常称为冲击后夹层压缩试验方法。 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 该方法使用了一个扁平的矩形试样，该试样之前经受过破坏事件，使用稳定夹具在沿边压缩载荷下进行测试。 1.4 该测试方法产生的财产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、损伤类型、尺寸和位置以及边界条件。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未损坏的试样，但应注意防止出现不期望的故障模式，如端部压碎。试验方法 第364页 和 7249米/7249米 是分别通过沿边压缩或长梁弯曲来测试未受损夹层板抗压强度的推荐测试方法。 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 对集中平面外力的损伤敏感性是许多夹层结构结构的主要设计关注点之一。 了解夹层结构的抗损伤性和剩余强度财产对于产品开发和材料选择非常有用。 5.2 使用该试验方法获得的残余强度数据最常用于材料选择、研究和开发活动以及确定设计容许值。 5.3 使用此测试方法获得的财产可以为类似面板和芯材、粘合剂、面板和芯厚度、面板堆叠顺序等的夹层结构的预期剩余强度能力提供指导。然而，必须理解夹层结构的残余强度高度依赖于几个因素，包括几何结构、厚度、刚度、支撑条件等。由于这些参数的差异，损伤状态和残余抗压强度之间的关系可能会产生显著差异。 5.4 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。 5.5 报告部分要求报告可能影响残余抗压强度的项目；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、整体试样厚度、试样几何形状、试样制备、试样调节、试验环境、类型、，损伤的大小和位置（包括无损检测方法）、试样/夹具对齐和夹紧、温度时间和测试速度。 5.6 残余强度评估结果包括: 标准化残余抗压强度 N 计算机辅助设计 压缩力作为十字头位移的函数，远场表面应变作为十字头移位的函数。

1.1 This test method covers compression residual strength properties of sandwich constructions that have been subjected to quasi-static indentation or drop-weight impact per Practice D7766/D7766M . Note 1: When used to determine the residual strength of drop-weight impacted plates, this test method is commonly referred to as the Sandwich Compression After Impact test method. 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, previously subjected to a damaging event, 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, the type, size, and location of damage 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 undamaged specimens, but care should be taken to prevent undesirable failure modes such as end crushing. Test Methods C364 and D7249/D7249M are the recommended test methods for undamaged sandwich panel compression strength by edgewise compression 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 Susceptibility to damage from concentrated out-of-plane forces is one of the major design concerns of many structures made of sandwich constructions. Knowledge of the damage resistance and residual strength properties of a sandwich construction is useful for product development and material selection. 5.2 The residual strength data obtained using this test method is most commonly used in material selection, research and development activities, and establishing design allowables. 5.3 The properties obtained using this test method can provide guidance in regard to the anticipated residual strength capability of sandwich constructions of similar facesheet and core material, adhesive, facesheet and core thickness, facesheet stacking sequence, and so forth. However, it must be understood that the residual strength of sandwich constructions is highly dependent upon several factors including geometry, thickness, stiffness, support conditions, and so forth. Significant differences in the relationships between the damage state and the residual compressive strength can result due to differences in these parameters. 5.4 The compression strength from this test may not be equivalent to the compression strength of sandwich structures subjected to flexural compression testing. 5.5 The reporting section requires items that tend to influence residual 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, specimen preparation, specimen conditioning, environment of testing, type, size and location of damage (including method of non-destructive inspection), specimen/fixture alignment and gripping, time at temperature, and speed of testing. 5.6 Results from the residual strength assessment include the following: normalized compressive residual strength N CAI , compressive force as a function of crosshead displacement, and far-field surface strains as functions of crosshead displacement.