1.1 本试验方法通过两种程序中的任何一种来确定高模量纤维增强复合材料的面内剪切财产。在程序A中，测试夹在两对加载轨道之间的层压材料。当加载张力时，钢轨在试样中引入剪切力。在步骤B中，对夹持在相对边缘上的层压板进行测试，并将张力或压缩力施加到中心的第三对钢轨上。 1.2 本试验方法仅适用于以下材料形式的连续纤维或不连续纤维增强聚合物基复合材料: 1.2.1 层压板仅由单向纤维层压板组成，纤维方向平行或垂直于夹具导轨。 1.2.2 仅由机织织物纤维层构成的层压板，其经线方向平行于或垂直于夹具导轨。 1.2.3 平衡和对称结构的层压板，0°方向平行或垂直于夹具轨道。 1.2.4 短纤维增强复合材料，其中大部分纤维是随机分布的。 注1: 测定聚合物基复合材料平面内剪切财产的其他试验方法可在试验方法中找到 D3518/D3518米 , D5379/D5379米 , D5448/D5448米 和 D7078/D7078米 . 1.3 该试验方法的再现性可能受到量规截面中剪切应力梯度和夹持区域应力集中的影响。 试验方法 D5379/D5379米 和 D7078/D7078米 与此测试方法相比，提供了更好的剪切响应，因为它们的试样配置在量规截面中产生了相对纯净和均匀的剪切应力状态。 1.4 自2001年以来，本标准的技术内容一直稳定，没有利益相关者的强烈反对。由于维护本标准的技术支持有限，自该日期起的变更仅限于保持与其他ASTM D30委员会标准一致性所需的项目，包括编辑性变更和纳入关于千分尺和卡尺、应变计要求、测试速度、试样预处理和环境测试的更新指南。 标准的未来维护将仅响应特定请求，仅在技术支持允许的情况下进行。 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。 1.5.1 在文本中，英寸磅单位显示在括号中。 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。 1.7 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 这些剪切试验旨在为材料规范、研发和设计提供面内剪切特性数据。影响剪切响应的因素，因此应予以报告，包括:材料、材料制备和铺设方法、试样堆叠顺序、试样制备、试样调节、试验环境、试样对齐和夹紧、试验速度、温度时间、空隙含量和纤维体积增强含量。 本试验方法可测量的财产包括: 5.1.1 在平面剪切应力与工程剪切应变响应之间， 5.1.2 平面剪切弦弹性模量， 5.1.3 偏移剪切应力，以及 5.1.4 最大平面内剪切应力。如果破坏时的工程剪切应变大于5 %, 剪切应力对应于5 % 应报告工程剪切应变。

1.1 This test method determines the in-plane shear properties of high-modulus fiber-reinforced composite materials by either of two procedures. In Procedure A, laminates clamped between two pairs of loading rails are tested. When loaded in tension, the rails introduce shear forces in the specimen. In Procedure B, laminates clamped on opposite edges with a tensile or compressive force applied to a third pair of rails in the center are tested. 1.2 Application of this test method is limited to continuous-fiber or discontinuous-fiber-reinforced polymer matrix composites in the following material forms: 1.2.1 Laminates composed only of unidirectional fibrous laminae, with the fiber direction oriented either parallel or perpendicular to the fixture rails. 1.2.2 Laminates composed only of woven fabric filamentary laminae with the warp direction oriented either parallel or perpendicular to the fixture rails. 1.2.3 Laminates of balanced and symmetric construction, with the 0° direction oriented either parallel or perpendicular to the fixture rails. 1.2.4 Short-fiber-reinforced composites with a majority of the fibers being randomly distributed. Note 1: Additional test methods for determining in-plane shear properties of polymer matrix composites may be found in Test Methods D3518/D3518M , D5379/D5379M , D5448/D5448M , and D7078/D7078M . 1.3 The reproducibility of this test method can be affected by the presence of shear stress gradients in the gage section and stress concentrations at the gripping areas. Test Methods D5379/D5379M and D7078/D7078M provide superior shear response in comparison to this test method, as their specimen configurations produce a relatively pure and uniform shear stress state in the gage section. 1.4 The technical content of this standard has been stable since 2001 without significant objection from its stakeholders. As there is limited technical support for the maintenance of this standard, changes since that date have been limited to items required to retain consistency with other ASTM D30 Committee standards, including editorial changes and incorporation of updated guidance on micrometers and calipers, strain gage requirements, speed of testing, specimen preconditioning and environmental testing. Future maintenance of the standard will only be in response to specific requests and performed only as technical support allows. 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-pounds 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 These shear tests are designed to produce in-plane shear property data for material specifications, research and development, and design. Factors that influence the shear response and should therefore be reported include: 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 fiber volume reinforcement content. Properties that may be measured by this test method include: 5.1.1 In-plane shear stress versus engineering shear strain response, 5.1.2 In-plane shear chord modulus of elasticity, 5.1.3 Offset shear stress, and 5.1.4 Maximum in-plane shear stress. In cases in which the engineering shear strain at failure is greater than 5 %, the shear stress corresponding to 5 % engineering shear strain should be reported.