1.1 本试验方法确定了高模量纤维增强复合材料的短梁强度。试样为短梁，由厚度达6.00 mm[0.25 in.]的弯曲或平坦层压材料加工而成。梁以三点弯曲加载。 1.2 本试验方法的应用仅限于连续或不连续纤维增强聚合物基复合材料，其弹性性能相对于梁的纵轴对称。 1.3 单位- 以SI单位或英寸-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是精确的等价物；因此，为了确保符合标准，每个系统应独立使用，两个系统的值不得组合使用。 1.3.1 在文本中，英寸-磅单位显示在括号中。 1.4 本标准并不旨在解决与i相关的所有安全问题（如有） 本标准的用户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。 1.5 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》中确立的国际公认标准化原则制定的。 ===意义和用途====== 5.1 在大多数情况下，由于内部应力的复杂性和该试样中可能出现的各种失效模式，通常不可能将短梁强度与任何一种材料特性联系起来。然而，失效通常由树脂和层间性能决定，并且已经发现，对于给定的试样几何形状、材料系统和堆叠顺序，测试结果是可重复的 ( 4. ) . 5.2 通过本试验方法确定的短梁强度可用于质量控制和工艺规范目的。它也可用于复合材料的对比试验，前提是在相同模式下始终发生故障 ( 5. ) . 5.3 本试验方法不限于第节规定范围内的试样 8. ，但仅限于使用4.0的荷载跨度长度与试样厚度之比和2.0 mm[0.08 in.]的最小试样厚度。

1.1 This test method determines the short-beam strength of high-modulus fiber-reinforced composite materials. The specimen is a short beam machined from a curved or a flat laminate up to 6.00 mm [0.25 in.] thick. The beam is loaded in three-point bending. 1.2 Application of this test method is limited to continuous- or discontinuous-fiber-reinforced polymer matrix composites, for which the elastic properties are balanced and symmetric with respect to the longitudinal axis of the beam. 1.3 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. 1.3.1 Within the text, the inch-pound units are shown in brackets. 1.4 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. 1.5 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 In most cases, because of the complexity of internal stresses and the variety of failure modes that can occur in this specimen, it is not generally possible to relate the short-beam strength to any one material property. However, failures are normally dominated by resin and interlaminar properties, and the test results have been found to be repeatable for a given specimen geometry, material system, and stacking sequence ( 4 ) . 5.2 Short-beam strength determined by this test method can be used for quality control and process specification purposes. It can also be used for comparative testing of composite materials, provided that failures occur consistently in the same mode ( 5 ) . 5.3 This test method is not limited to specimens within the range specified in Section 8 , but is limited to the use of a loading span length-to-specimen thickness ratio of 4.0 and a minimum specimen thickness of 2.0 mm [0.08 in.].