1.1 本试验方法涵盖了高模量纤维增强复合材料的剪切性能。复合材料限于以下材料形式的连续纤维或不连续纤维增强复合材料: 1.1.1 仅由单向纤维层组成的层压板，纤维方向平行或垂直于加载轴。 1.1.2 仅由经向平行或垂直于加载轴的机织物丝状薄片组成的层压板。 1.1.3 仅由单向纤维层组成的层压板，包含以平衡和对称的堆叠顺序以0°和90°取向的相等数量的层，0°方向平行或垂直于加载轴取向。 1.1.4 大部分纤维随机分布的短纤维增强复合材料。 附注1: 这种剪切测试概念最初是在没有参考纤维方向的情况下开发的，用于各向同性材料，如金属或陶瓷。 1.2 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。 1.2.1 在正文中，英寸-磅单位显示在括号中。 1.3 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。1.4 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《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 该测试方法旨在为材料规格、研究和开发、质量保证以及结构设计和分析提供剪切性能数据。取决于材料坐标系相对于加载轴的取向，可以评估平面内或层间剪切特性。影响剪切响应并因此应报告的因素包括:材料、材料制备方法和铺设-上，样品堆叠顺序、样品制备、样品调节、测试环境、样品对准和夹紧、测试速度、温度下的时间、空隙含量和体积百分比增强。 5.2 在各向异性材料中，通过将样品的测试平面与所需的材料平面定向，可以在六个可能的剪切平面中的任何一个中获得性能（ 1-2 或者 2-1, 1-3 或者 3-1, 2-3 或者 3-2 ).对于任何给定的样本，只能评估单个剪切平面。可从该测试方法获得的在测试方向上的性能包括以下内容: 5.2.1 剪切应力/应变响应， 5.2.2 极致的实力， 5.2.3 极限应变，以及 5.2.4 剪切弦弹性模量。

1.1 This test method covers the shear properties of composite materials reinforced by high-modulus fibers. The composite materials are limited to continuous-fiber or discontinuous-fiber-reinforced composites in the following material forms: 1.1.1 Laminates composed only of unidirectional fibrous laminae, with the fiber direction oriented either parallel or perpendicular to the loading axis. 1.1.2 Laminates composed only of woven fabric filamentary laminae with the warp direction oriented either parallel or perpendicular to the loading axis. 1.1.3 Laminates composed only of unidirectional fibrous laminae, containing equal numbers of plies oriented at 0 and 90° in a balanced and symmetric stacking sequence, with the 0° direction oriented either parallel or perpendicular to the loading axis. 1.1.4 Short-fiber-reinforced composites with a majority of the fibers being randomly distributed. Note 1: This shear test concept was originally developed without reference to fiber direction for use on isotropic materials such as metals or ceramics. 1.2 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. 1.2.1 Within the text, the inch-pound units are shown in brackets. 1.3 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. 1.4 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 is designed to produce shear property data for material specifications, research and development, quality assurance, and structural design and analysis. Either in-plane or interlaminar shear properties may be evaluated, depending upon the orientation of the material coordinate system relative to the loading axis. Factors that influence the shear response and should therefore be reported include the following: material, methods of material preparation and lay-up, specimen stacking sequence, specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, speed of testing, time at temperature, void content, and volume percent reinforcement. 5.2 In anisotropic materials, properties may be obtained in any of the six possible shear planes by orienting the testing plane of the specimen with the desired material plane ( 1-2 or 2-1, 1-3 or 3-1, 2-3 or 3-2 ). Only a single shear plane may be evaluated for any given specimen. Properties, in the test direction, which may be obtained from this test method, include the following: 5.2.1 Shear stress/strain response, 5.2.2 Ultimate strength, 5.2.3 Ultimate strain, and 5.2.4 Shear chord modulus of elasticity.