1.1 该测试方法测量处于一种特定夹紧配置的平板复合板在自由飞行中对钝弹穿透的阻力。在该测试方法中，术语“穿透”被定义为射弹完全穿过复合板并完全离开背侧的情况。复合材料可以是连续纤维角层、机织或编织的纤维增强聚合物基质复合材料，或短切纤维增强复合材料。通过定义给定动能的穿透概率的统计函数来量化穿透阻力。 1.2 该测试方法适用于厚度尺寸与测试面板宽度和长度相比较小的复合测试面板（厚度跨度约为40或更大）。1.3 该测试方法旨在用于喷气发动机风扇安全壳、开放式转子发动机叶片安全壳或其他需要保护速度通常低于弹道装甲应用的射弹的应用。该测试的典型冲击速度在100米/秒至500米/秒【300英尺/秒至1500英尺/秒】的范围内，而不是与装甲穿透相关的更高速度。 1.4 一种平板复合板固定在圆形夹紧夹具和大基座夹具之间，每个基座夹具具有大的同轴孔，该大的同轴孔限定了面板的区域，该区域在垂直于平板平面的方向上受到钝射物的冲击。夹紧压力由穿过前夹具、试样和背板的螺栓28提供。在测试之前确定射弹相对于面板的质量、几何形状、期望的冲击动能和冲击方向。测试期间需要测量实际冲击速度和方向的设备和程序。冲击穿透阻力可以通过射弹完全穿透测试面板所需的速度或动能来量化。对于给定的冲击条件，需要进行大量的测试来获得穿透的统计概率。 1.5 该测试方法测量特定射弹和测试配置的抗穿透性，可用于筛选材料的抗冲击穿透性，比较不同复合材料在相同测试几何形状条件下的抗冲击穿透性，或评估in-服务或环境暴露对材料抗冲击渗透能力的影响。 1.6 抗冲击穿透能力高度依赖于测试面板材料和结构、射弹几何形状和质量以及面板边界条件。结果通常不能扩展到其他配置，但是对于相同的测试配置，可以用于评估不同材料和纤维结构的相对抗冲击穿透能力。 1.7 单位- 以SI单位或英寸-磅单位表示的值应单独视为标准值。每个系统中陈述的值不一定完全等同；因此，为确保符合标准，每个系统应独立使用，两个系统的数值不得合并使用。在正文中，英寸-磅单位显示在括号中。 1.8 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 1.9 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 先进的复合材料系统在许多应用中用作屏蔽以防止射弹穿透。通常，复合材料的使用对于钝的而不是锋利的射弹或在混合系统中更有效，在混合系统中可以使用额外的屏蔽来钝化锋利的射弹。了解不同材料系统的抗穿透冲击性或环境或使用中载荷暴露对给定材料抗穿透性的影响对于产品开发和材料选择是有用的。 5.2 用于测量材料抗穿透性的冲击试验可用于以下目的: 5.2.1 量化纤维结构、堆叠顺序、纤维和基体材料选择以及加工参数对不同复合材料抗穿透性的影响； 5.2.2 测量环境或使用中载荷暴露对给定材料系统抗穿透冲击性的影响；和 5.2.3 作为满足抗渗透应用材料质量保证要求的工具。 5.3 通过该测试方法获得的抗渗透值最常用于材料规格和选择以及研究和开发活动。这些数据不打算用于建立设计允许量，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。 5.4 报告部分要求倾向于影响材料系统抗穿透性的项目。这些包括以下内容:纤维和基质材料、纤维结构、铺层顺序、材料制造方法、环境暴露参数、样品几何形状和总厚度、空隙含量、样品调节、测试环境和暴露时间、样品夹具和对准、射弹质量和几何形状以及撞击时的射弹方向。其他报告要求包括损坏的大小和描述、任何测试前和测试后无损检查的结果、撞击速度、速度测量设备的准确性以及射弹是否穿透面板。残余速度是要报告的期望但不是必需的值。 5.5 报告部分还应包括一个统计函数的参数，该函数给出了作为冲击动能函数的穿透概率（见 14.4 ). 5.6 冲击试验产生的相关测量是射弹的动能和冲击速度以及射弹是否穿透试样。如果记录剩余速度的测量值，则要测量的可选项目是作为撞击速度的函数的射弹动能损失。

1.1 This test method measures the resistance of flat composite panels in one specific clamping configuration to penetration by a blunt projectile in free flight. In this test method, the term “penetration” is defined as the case in which the projectile travels completely through the composite panel and fully exits the back side. The composite materials may be continuous fiber angle-ply, woven or braided fiber-reinforced polymer matrix composites, or chopped fiber-reinforced composites. The resistance to penetration is quantified by a statistical function that defines the probability of penetration for a given kinetic energy. 1.2 This test method is intended for composite test panels in which the thickness dimension is small compared with the test panel width and length (span to thickness on the order of 40 or greater). 1.3 This test method is intended for applications such as jet engine fan containment, open rotor engine blade containment, or other applications in which protection is needed for projectiles at velocities typically lower than seen in ballistic armor applications. The typical impact velocity that this test is intended for is in the range of 100 m/s to 500 m/s [300 ft/s to 1500 ft/s], as opposed to higher velocities associated with armor penetration. 1.4 A flat composite panel is fixed between a circular-shaped clamping fixture and a large base fixture each with a large coaxial hole defining a region of the panel that is subjected to impact in the direction normal to the plane of the flat panel by a blunt projectile. Clamping pressure is provided by 28 through bolts that pass through the front clamp, the test specimen, and the back plate. The mass, geometry, desired impact kinetic energy, and impact orientation of the projectile with respect to the panel are specified before the test. Equipment and procedures are required for measuring the actual impact velocity and orientation during the test. The impact penetration resistance can be quantified by either the velocity or kinetic energy required for the projectile to penetrate the test panel fully. A number of tests are required to obtain a statistical probability of penetration for given impact conditions. 1.5 This test method measures the penetration resistance for a specific projectile and test configuration and can be used to screen materials for impact penetration resistance, compare the impact penetration resistance of different composite materials under the same test geometry conditions, or assess the effects of in-service or environmental exposure on the impact penetration resistance of materials. 1.6 The impact penetration resistance is highly dependent on the test panel materials and architecture, projectile geometry and mass, and panel boundary conditions. Results are not generally scalable to other configurations but, for the same test configurations, may be used to assess the relative impact penetration resistance of different materials and fiber architectures. 1.7 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. Within the text the inch-pound units are shown in brackets. 1.8 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. 1.9 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 Advanced composite systems are used in a number of applications as shields to prevent penetration by projectiles. In general, the use of composites is more effective for blunt, rather than sharp, projectiles or in hybrid systems in which an additional shield can be used to blunt a sharp projectile. Knowledge of the penetration impact resistance of different material systems or the effects of environmental or in-service load exposure to the penetration resistance of given materials is useful for product development and material selection. 5.2 An impact test used to measure the penetration resistance of a material can serve the following purposes: 5.2.1 To quantify the effect of fiber architecture, stacking sequence, fiber and matrix material selection, and processing parameters on the penetration resistance of different composite materials; 5.2.2 To measure the effects of environmental or in-service load exposure on the penetration impact resistance of a given material system; and 5.2.3 As a tool for quality assurance requirements for materials designed for penetration resistance applications. 5.3 The penetration resistance values obtained with this test method are most commonly used in material specification and selection 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 not generally scalable to other configurations. 5.4 The reporting section requires items that tend to influence the penetration resistance of material systems. These include the following: fiber and matrix materials, fiber architecture, layup sequence, methods of material fabrication, environmental exposure parameters, specimen geometry and overall thickness, void content, specimen conditioning, testing environment and exposure time, specimen fixture and alignment, projectile mass and geometry, and projectile orientation at impact. Additional reporting requirements include size and description of damage, results of any pre- and post-test nondestructive inspection, impact velocity, accuracy of the velocity measurement apparatus, and whether or not the projectile penetrated the panel. Residual velocity is a desirable, but not a necessary, value to be reported. 5.5 The reporting section shall also include the parameters of a statistical function that gives the probability of penetration as a function of impact kinetic energy (see 14.4 ). 5.6 The relevant measurements that result from the impact test are the kinetic energy and impact velocity of the projectile and whether or not the projectile penetrated the specimen. An optional item to be measured is the loss in kinetic energy of the projectile as a function of impact velocity if measurements of the residual velocity are recorded.