1.1 本试验方法涵盖了按照试验方法进行准静态压痕的多向聚合物基复合材料层压板的压缩残余强度特性 D6264/D6264米 或根据试验方法的跌落重量冲击 D7136/D7136米 在施加压缩力之前。复合材料形式仅限于具有多向纤维取向的连续纤维增强聚合物基复合材料，并且其相对于测试方向既对称又平衡。可接受的测试层压板和厚度的范围在 8.2 。 注1: 当用于测定落锤冲击板的残余强度时，该试验方法通常被称为冲击后压缩法或CAI法。 1.2 该方法使用了一块扁平的矩形复合板，该复合板之前曾遭受过破坏事件，并使用稳定夹具在压缩载荷下进行测试。 注2: 所获得的损伤容限特性与施加在板上的损伤的类型、几何形状和位置有关。 1.3 该试验方法产生的特性高度依赖于几个因素，包括试样几何形状、叠层、损伤类型、损伤尺寸、损伤位置和边界条件。 因此，结果通常不能扩展到其他配置，并且对于测试的几何和物理条件的组合是特定的。 1.4 该测试方法可用于测试未损坏的聚合物基复合材料板，但从历史上看，此类测试表明，不良失效模式（如端部挤压）的发生率相对较高。试验方法 D6641/D6641米 建议用于获得未损坏的聚合物基复合材料的压缩性能。 1.5 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。 每个系统中规定的值不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且两个系统的值不得合并。 1.5.1 在文本中，英寸磅单位显示在括号中。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 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 平面外集中力对损伤的敏感性是许多由先进复合材料层压板制成的结构的主要设计问题之一。层合复合材料板的抗损伤和损伤容限特性的知识对产品开发和材料选择很有用。 5.2 使用该测试方法获得的残余强度数据最常用于材料规范和研发活动。这些数据不用于确定设计容许值，因为结果是特定于测试的几何形状和物理条件的，通常不能扩展到其他配置。由于诱发损伤的固有可变性，以及损伤容限响应对预先存在的损伤状态的依赖性，其在制定质量保证要求方面的作用也有限。 5.3 使用该测试方法获得的性能可以为类似材料、厚度、堆叠顺序等复合材料结构的预期损伤容限能力提供指导。然而，必须理解的是，复合材料结构的损伤容限高度依赖于几个因素，包括几何形状、刚度、支撑条件等。由于这些参数的差异，可能导致现有损伤状态和残余抗压强度之间的关系存在显著差异。 例如，使用该试验方法获得的残余强度和刚度特性更有可能反映未加筋的整体蒙皮或腹板的损伤容限特性，而不是连接到抵抗平面外变形的下部结构上的蒙皮的损坏容限特性。类似地，与明显大于试样的面板的性能相比，试样的性能应与具有同等长度和宽度尺寸的面板的特性相似。 5.4 报告部分要求报告倾向于影响残余抗压强度的项目； 其中包括以下内容:材料、材料制造方法、铺设方向的准确性、层压板堆叠顺序和总厚度、试样几何形状、试样制备、试样处理、试验环境、空隙率、钢筋体积百分比、损伤类型、尺寸和位置（包括无损检测方法），样品/夹具对准和夹紧、在温度下的时间和测试速度。 5.5 残余强度评估得出的特性包括:压缩残余强度 F 蔡 ，作为十字头位移函数的压缩力，以及作为十字头移位函数的表面应变。

1.1 This test method covers compression residual strength properties of multidirectional polymer matrix composite laminated plates, which have been subjected to quasi-static indentation per Test Method D6264/D6264M or drop-weight impact per Test Method D7136/D7136M prior to application of compressive force. The composite material forms are limited to continuous-fiber reinforced polymer matrix composites with multidirectional fiber orientations, and which are both symmetric and balanced with respect to the test direction. The range of acceptable test laminates and thicknesses is defined in 8.2 . Note 1: When used to determine the residual strength of drop-weight impacted plates, this test method is commonly referred to as the Compression After Impact, or CAI, method. 1.2 The method utilizes a flat, rectangular composite plate, previously subjected to a damaging event, which is tested under compressive loading using a stabilization fixture. Note 2: The damage tolerance properties obtained are particular to the type, geometry and location of damage inflicted upon the plate. 1.3 The properties generated by this test method are highly dependent upon several factors, which include specimen geometry, layup, damage type, damage size, damage location, and boundary conditions. Thus, results are generally not scalable to other configurations, and are particular to the combination of geometric and physical conditions tested. 1.4 This test method can be used to test undamaged polymer matrix composite plates, but historically such tests have demonstrated a relatively high incidence of undesirable failure modes (such as end crushing). Test Method D6641/D6641M is recommended for obtaining compressive properties of undamaged polymer matrix composites. 1.5 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. 1.5.1 Within the text the inch-pound units are shown in brackets. 1.6 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. 1.7 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 advanced composite laminates. Knowledge of the damage resistance and damage tolerance properties of a laminated composite plate 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 specifications and research and development activities. The data are not intended for use in establishing design allowables, as the results are specific to the geometry and physical conditions tested and are generally not scalable to other configurations. Its usefulness in establishing quality assurance requirements is also limited, due to the inherent variability of induced damage, as well as the dependency of damage tolerance response upon the pre-existent damage state. 5.3 The properties obtained using this test method can provide guidance in regard to the anticipated damage tolerance capability of composite structures of similar material, thickness, stacking sequence, and so forth. However, it must be understood that the damage tolerance of a composite structure is highly dependent upon several factors including geometry, stiffness, support conditions, and so forth. Significant differences in the relationships between the existent damage state and the residual compressive strength can result due to differences in these parameters. For example, residual strength and stiffness properties obtained using this test method would more likely reflect the damage tolerance characteristics of an un-stiffened monolithic skin or web than that of a skin attached to substructure which resists out-of-plane deformation. Similarly, test specimen properties would be expected to be similar to those of a panel with equivalent length and width dimensions, in comparison to those of a panel significantly larger than the test specimen. 5.4 The reporting section requires items that tend to influence residual compressive strength to be reported; these include the following: material, methods of material fabrication, accuracy of lay-up orientation, laminate stacking sequence and overall thickness, specimen geometry, specimen preparation, specimen conditioning, environment of testing, void content, volume percent reinforcement, type, size and location of damage (including method of non-destructive inspection), specimen/fixture alignment and gripping, time at temperature, and speed of testing. 5.5 Properties that result from the residual strength assessment include the following: compressive residual strength F CAI , compressive force as a function of crosshead displacement, and surface strains as functions of crosshead displacement.