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Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials 聚合物基复合材料弯曲性能的标准试验方法
发布日期: 2021-01-01
1.1 该试验方法确定了聚合物基复合材料的弯曲刚度和强度特性。 1.1.1 程序A- 在简支梁上利用中心荷载的三点加载系统。 1.1.2 程序B- 四点加载系统,利用两个与相邻支撑点等距分布的加载点,加载点之间的距离为支撑跨度的一半。 注1: 与试验方法不同 D6272 ,允许在支架跨度的三分之一和一半处加载,为了标准化几何形状和简化计算,本标准仅允许在支架跨度的一半处加载。 1.2 出于比较目的,可根据任何一种试验程序进行试验,前提是所有试验均使用相同的程序,因为这两种程序通常给出稍有不同的特性值。 1.3 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。每个系统中规定的值不一定是精确的等价物;因此,为确保符合本标准,每个系统应独立使用,且两个系统的值不得组合。 1.4 本标准并非旨在解决与其使用相关的所有安全问题(如有)。本标准的用户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。 1.5 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 本试验方法确定了聚合物基复合材料在规定条件下的弯曲性能(包括强度、刚度和载荷/挠度行为)。程序A用于三点加载,程序B用于四点加载。该试验方法是为了优化连续纤维增强聚合物基复合材料的使用而开发的,在几个方面与其他弯曲方法不同,包括使用32:1的标准跨厚比和试验方法使用的16:1的标准跨厚比 D790 (一种涵盖三点弯曲的塑料聚焦方法)和 D6272 (a)塑料- 聚焦方法包括四点弯曲)。 5.2 本试验方法旨在与通过试验方法评估的短梁强度相比,检查长梁强度 D2344/D2344M . 5.3 通过这些程序确定的弯曲性能可用于质量控制和规范目的,并可用于设计应用。 5.4 这些程序可用于评估多种环境条件,以确定哪些是设计驱动因素,可能需要进一步测试。 5.5 这些程序也可用于确定结构的弯曲性能。
1.1 This test method determines the flexural stiffness and strength properties of polymer matrix composites. 1.1.1 Procedure A— A three-point loading system utilizing center loading on a simply supported beam. 1.1.2 Procedure B— A four-point loading system utilizing two load points equally spaced from their adjacent support points, with a distance between load points of one-half of the support span. Note 1: Unlike Test Method D6272 , which allows loading at both one-third and one-half of the support span, in order to standardize geometry and simplify calculations, this standard permits loading at only one-half the support span. 1.2 For comparison purposes, tests may be conducted according to either test procedure, provided that the same procedure is used for all tests, since the two procedures generally give slightly different property values. 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. 1.4 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 This test method determines the flexural properties (including strength, stiffness, and load/deflection behavior) of polymer matrix composite materials under the conditions defined. Procedure A is used for three-point loading and Procedure B is used for four-point loading. This test method was developed for optimum use with continuous-fiber-reinforced polymer matrix composites and differs in several respects from other flexure methods, including the use of a standard span-to-thickness ratio of 32:1 versus the 16:1 ratio used by Test Methods D790 (a plastics-focused method covering three-point flexure) and D6272 (a plastics-focused method covering four-point flexure). 5.2 This test method is intended to interrogate long-beam strength in contrast to the short-beam strength evaluated by Test Method D2344/D2344M . 5.3 Flexural properties determined by these procedures can be used for quality control and specification purposes, and may find design applications. 5.4 These procedures can be useful in the evaluation of multiple environmental conditions to determine which are design drivers and may require further testing. 5.5 These procedures may also be used to determine flexural properties of structures.
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归口单位: D30.04
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