1.1 本规程提供了使用试验方法的说明 D6484/D6484米 开孔压缩试验夹具，用于确定多向层压板的无缺口压缩强度。复合材料形式仅限于连续纤维增强聚合物基复合材料，其中层压板相对于测试方向对称且平衡。可接受的测试层压板和厚度的范围在 8.2.1 。 1.2 单位- 以国际单位制或英寸表示的数值- 磅单位应单独视为标准。每个系统中规定的值不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且两个系统的值不得合并。 1.2.1、 在文本中，英寸磅单位显示在括号中。 1.3 本标准并非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。 1.4 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 本规程为试验方法的使用提供了补充说明 D6484/D6484米 确定材料规格、研发、材料设计允许值和质量保证的无缺口抗压强度数据。 影响抗压强度的因素包括:材料、材料制造方法、叠层精度、层压板堆叠顺序和总厚度、试样制备、试样处理、试验环境、试样对齐和夹紧、试验速度、温度下的时间、空隙率、，以及体积百分比增强。可通过该试验方法获得的试验方向上的复合材料特性包括: 5.1.1 无缺口压缩（UNC）强度， F x 联合国气候变化框架 ， 5.1.2 极限压缩应变， 5.1.3 压缩（线性或弦）弹性模量， E c 和 5.1.4 压缩泊松比。 5.2 本规程为含有多个纤维方向纤维的层压板提供了一种压缩试验方法，特别是将轴向（0度）纤维和离轴（±θ度）纤维结合在一起的层压板。其他压缩强度测试方法包括SACMA SRM-1（也称为改良的 D695天 )， D3410/D3410米 ， D5467/D5467米 ， D6641/D6641米 和 D7249/D7249米 SRM-1试验使用12.6 mm[0.50 in.]宽的试样，其仅适用于单向胶带、交叉层[0/90]ns胶带或小单元尺寸织物（例如3K-70-P）。较大网孔尺寸的织物（例如，12K平展丝束织物）应使用较宽的试样进行测试。标准 D3410/D3410米 和 D6641/D6641米 测试夹具确实允许使用更宽的试样，例如25.4 mm[1.0 in.]宽，因此可以用于测试包含轴向和非轴向的层压板- 轴纤维；然而它们的标距长度相对较短。试验方法 D5467/D5467米 旨在获得单向层压板的压缩强度，但由于夹层梁配置而昂贵。试验方法 D7249/D7249米 旨在获得夹层面板的抗压强度。 5.2.1 这种做法的优点包括: 5.2.1.1条 避免使用翼片，这通常是端部加载SRM-1试样所需的，而剪切加载试验方法通常需要翼片 D3410/D3410米 试样，有时试验方法要求 D6641/D6641米 试样，以便获得有效的失效模式，以及 5.2.1.2条 更长、更宽的量规截面对平面内横向位移的约束较小。 5.2.2 这种做法的缺点包括: 5.2.2.1 更长、更宽的试样，因此比上述其他标准消耗更多的材料

1.1 This practice provides instructions for using the Test Method D6484/D6484M open hole compression test fixture to determine unnotched compressive strength of multi-directional laminates. The composite material forms are limited to continuous-fiber reinforced polymer matrix composites in which the laminate is both symmetric and balanced with respect to the test direction. The range of acceptable test laminates and thicknesses are described in 8.2.1 . 1.2 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. 1.2.1 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 practice provides supplemental instructions for the use of Test Method D6484/D6484M to determine unnotched compressive strength data for material specifications, research and development, material design allowables, and quality assurance. Factors that influence compressive strengths and shall therefore be reported include the following: material, methods of material fabrication, accuracy of lay-up, laminate stacking sequence and overall thickness, specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, speed of testing, time at temperature, void content, and volume percent reinforcement. Composite properties in the test direction that may be obtained from this test method include: 5.1.1 Unnotched compressive (UNC) strength, F x unc , 5.1.2 Ultimate compressive strain, 5.1.3 Compressive (linear or chord) modulus of elasticity, E c , and 5.1.4 Poisson's ratio in compression. 5.2 This practice provides a compression test method for laminates containing fibers in multiple fiber directions, particularly those combining axial (0 degree) fibers and off-axis (± θ degree) fibers. Other compression strength test methods include SACMA SRM-1 (also known as the modified D695 ), D3410/D3410M , D5467/D5467M , D6641/D6641M , and D7249/D7249M . The SRM-1 test uses 12.6 mm [0.50 in.] wide specimens, which is only appropriate for unidirectional tape, cross-ply [0/90]ns tape, or small unit-cell-size fabrics (e.g. 3K-70-P). Larger cell-size fabrics (for example, spread-tow 12K fabrics) should be tested with wider specimens. The standard D3410/D3410M and D6641/D6641M test fixtures do permit the use of wider specimens, for example, 25.4 mm [1.0 in.] wide, and thus can be used to test laminates containing both axial and off-axis fibers; however their gage lengths are relatively short. Test Method D5467/D5467M is intended to obtain the compressive strength of unidirectional laminates, but is expensive due to the sandwich beam configuration. Test Method D7249/D7249M is intended to obtain the compressive strength of sandwich facesheets. 5.2.1 Advantages of this practice include: 5.2.1.1 Avoiding the use of tabs, which are typically required with the end-loaded SRM-1 specimen, which are often required with the shear loaded Test Method D3410/D3410M specimen, and sometimes required with the Test Method D6641/D6641M test specimen, in order to obtain valid failure modes, and 5.2.1.2 Longer and wider gage section imposing less constraint on in-plane transverse displacement. 5.2.2 Disadvantages of this practice include: 5.2.2.1 Longer and wider specimen, thus consuming more material than other standards noted above