1.1 本规程涵盖了平板（平行表面）复合材料和扁平夹层夹芯板的两种超声波检测程序。典型的预制叠层包括单轴、交叉层和角度层压板，以及蜂窝夹芯芯材料。这些程序可用于材料的整个生命周期:产品和工艺设计优化、在线工艺控制、制造后检查和在役检查。没有讨论接触方法，例如使用剪切波的角梁技术。 1.2 超声波检测是检测层状不连续性的一种常见的表面下方法。基于面板表面可达性，可以考虑两种技术；单侧的脉冲回波和双侧的通过传输（起泡器/喷射器）。 如在该实践中所使用的，两者都需要使用脉冲直波束超声波纵波，然后观察反射波（脉冲回波）或接收波（通过传输）的指示。这两种技术检测到的一般异常类型包括异物、分层、脱粘/脱粘、纤维脱粘、夹杂物、孔隙率和孔隙。 1.3 本规程提供了两种超声波检测程序。这些测试程序可以应用于小面积手动扫描和大面积自动扫描。每种都有自己的优点和检查要求，应按照合同文件中的约定进行选择。 1.3.1 测试程序A，脉冲回波（非接触式和接触式）， 至少是发送和接收0范围内的纵波的单个换能器。 5. MHz至20 MHz（请参阅 图1 ). 该程序只需要接近试样的一侧。该程序可以通过自动或手动方式进行。可以对自动和手动测试结果进行成像或记录。 图1 测试程序A，脉冲回波装置设置示例 1.3.2 测试程序B，通过变速器， 是两个换能器的组合。一个发射纵波，另一个接收0.5范围内的纵波 MHz至20 MHz（请参阅 图2 例如使用喷射器的设置）。此程序要求接触试样的两侧。该程序是自动化的，并记录检查结果。 图2 试验程序B，使用Squirters设置的直通传动装置 1. 4. 此做法未指定接受-拒绝标准。 1.5 单位-- 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 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 本规程主要用于根据采购订单或其他合同文件中最常见的验收标准测试平板复合材料和夹芯板。 5.2 应用基础-- 在这种做法中，有些领域需要认可的工程组织和供应商之间达成协议，或认可的工程机构的具体指导。

1.1 This practice covers two procedures for ultrasonic testing (UT) of flat panel (parallel surfaces) composites and flat sandwich core panels. Typical as-fabricated lay-ups include uniaxial, cross ply, and angle ply laminates, as well as honeycomb sandwich core materials. These procedures can be used throughout the life cycle of the materials: product and process design optimization, on line process control, after manufacture inspection, and in-service inspection. Contact methods, such as angle-beam techniques using shear waves, are not discussed. 1.2 Ultrasonic testing is a common subsurface method for detection of laminar discontinuities. Two techniques can be considered based on panel surface accessibility; pulse echo for one sided and through transmission (bubblers/squirters) for two sided. As used in this practice, both require the use of a pulsed straight-beam ultrasonic longitudinal wave followed by observing indications of either the reflected (pulse-echo) or received (through transmission) wave. The general types of anomalies detected by both techniques include foreign materials, delamination, disbond/un-bond, fiber de-bonding, inclusions, porosity, and voids. 1.3 This practice provides two ultrasonic test procedures. These test procedures can be applied to small area manual scanning and large area automated scanning. Each has its own merits and requirements for inspection and shall be selected as agreed upon in a contractual document. 1.3.1 Test Procedure A, Pulse Echo (Non-contacting and Contacting), is at a minimum a single transducer transmitting and receiving a longitudinal wave in the range of 0.5 MHz to 20 MHz (see Fig. 1 ). This procedure requires access to only one side of the specimen. This procedure can be conducted by automated or manual means. Automated and manual test results may be imaged or recorded. FIG. 1 Test Procedure A, Example Pulse Echo Apparatus Set-ups 1.3.2 Test Procedure B, Through Transmission, is a combination of two transducers. One transmits a longitudinal wave and the other receives the longitudinal wave in the range of 0.5 MHz to 20 MHz (see Fig. 2 for an example set-up using squirters). This procedure requires access to both sides of the specimen. This procedure is automated and the examination results are recorded. FIG. 2 Test Procedure B, Through Transmission Apparatus Set-up Using Squirters 1.4 This practice does not specify accept-reject criteria. 1.5 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 This practice is intended primarily for the testing of flat panel composites and sandwich core panels to an acceptance criteria most typically specified in a purchase order or other contractual document. 5.2 Basis of Application— There are areas in this practice that require agreement between the cognizant engineering organization and the supplier, or specific direction from the cognizant engineering organization.