1.1 该试验方法使用组合载荷压缩（CLC）测定聚合物基复合材料的抗压强度和刚度特性 ( 1. ) 2. 测试夹具。本试验方法适用于平衡对称的一般复合材料。根据需要，可以对试样进行脱标签（步骤A）或标签（步骤B）。成功测试的一个要求是试样端部在测试过程中不会压碎。未经修补的试样通常适用于低正交异性材料，例如织物、短切纤维复合材料和最大50 %0°帘布层或等效物（参见 6.4 )。正交各向异性较高的材料，包括单向复合材料，通常需要翼片。 1.2 压缩力通过端部载荷和剪切载荷的组合引入试样中。相比之下，试验方法 D3410/D3410米 是一种纯剪切载荷压缩试验方法和试验方法 D695 是一种纯端部载荷试验方法。 1.3 可以测试单向（0°铺层取向）复合材料以及多向复合材料层压板、织物复合材料、短切纤维复合材料和类似材料。 1.4 以国际单位制或英寸磅单位表示的数值应单独视为标准。在测试中，英寸磅单位显示在括号中。每个系统中规定的数值并不完全相等；因此，每个系统都必须独立使用。 将两个系统的值结合起来可能会导致不符合标准。 注1: 测定聚合物基复合材料压缩性能的其他程序可在试验方法中找到 D3410/D3410米 ， D5467/D5467米 和 D695 。 1.5 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。 1.6 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 该测试方法旨在为材料规范、研发、质量保证以及结构设计和分析提供压缩性能数据。当测试片状（程序B）试样（通常为单向复合材料）时，CLC试验方法（组合剪切端载荷）与试验方法相似 D3410/D3410米 （剪切载荷）和 D695 （端部载荷）。当测试强度较低的材料，以便可以使用未弯曲的CLC试样时（程序A），组合荷载的好处变得特别突出。使用其他两种方法中的任何一种都可能无法成功测试这些相同材料的未加标签试样。 当测试特定的层压板时（主要是[90/0] ns 族，尽管可以使用其他至少包含一个0°层压板的层压板），CLC数据经常用于“回退”0°层强度，使用层压板理论计算0°单向层压板强度 ( 1. ， 2. ) 影响压缩响应的因素包括:材料类型、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、试验速度、温度下的时间、空隙率和钢筋体积百分比。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 极限抗压强度， 5.1.2 极限压缩应变， 5.1.3 压缩（线性或弦）弹性模量，以及 5.1.4 压缩泊松比。

1.1 This test method determines the compressive strength and stiffness properties of polymer matrix composite materials using a combined loading compression (CLC) ( 1 ) 2 test fixture. This test method is applicable to general composites that are balanced and symmetric. The specimen may be untabbed (Procedure A) or tabbed (Procedure B), as required. One requirement for a successful test is that the specimen ends do not crush during the test. Untabbed specimens are usually suitable for use with materials of low orthotropy, for example, fabrics, chopped fiber composites, and laminates with a maximum of 50 % 0° plies, or equivalent (see 6.4 ). Materials of higher orthotropy, including unidirectional composites, typically require tabs. 1.2 The compressive force is introduced into the specimen by combined end- and shear-loading. In comparison, Test Method D3410/D3410M is a pure shear-loading compression test method and Test Method D695 is a pure end-loading test method. 1.3 Unidirectional (0° ply orientation) composites as well as multi-directional composite laminates, fabric composites, chopped fiber composites, and similar materials can be tested. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the test the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Note 1: Additional procedures for determining the compressive properties of polymer matrix composites may be found in Test Methods D3410/D3410M , D5467/D5467M , and D695 . 1.5 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. 1.6 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 compressive property data for material specifications, research and development, quality assurance, and structural design and analysis. When tabbed (Procedure B) specimens, typically unidirectional composites, are tested, the CLC test method (combined shear end loading) has similarities to Test Methods D3410/D3410M (shear loading) and D695 (end loading). When testing lower strength materials such that untabbed CLC specimens can be used (Procedure A), the benefits of combined loading become particularly prominent. It may not be possible to successfully test untabbed specimens of these same materials using either of the other two methods. When specific laminates are tested (primarily of the [90/0] ns family, although other laminates containing at least one 0° ply can be used), the CLC data are frequently used to “back out” 0° ply strength, using lamination theory to calculate a 0° unidirectional lamina strength ( 1 , 2 ) . Factors that influence the compressive response include: type of material, methods of material preparation and lay-up, specimen stacking sequence, specimen preparation, specimen conditioning, environment of testing, 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 Ultimate compressive strength, 5.1.2 Ultimate compressive strain, 5.1.3 Compressive (linear or chord) modulus of elasticity, and 5.1.4 Poisson's ratio in compression.