1.1本试验方法涵盖了纤维增强拉挤塑料棒弯曲性能的测定。试样是一根横截面为半圆的杆，由拉挤杆模制或切割而成（见图1）。本试验方法适用于直径为 1. / 2. 在里面或更大。 笔记 1-该试验方法没有已知的ISO等效物。 1.2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可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 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）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 图1试样横截面 ====意义和用途====== 通过本试验方法确定的弯曲性能对于质量控制和规范目的特别有用。 最大轴向纤维应力发生在加载鼻下方的一条线上。半圆截面的使用消除了在全圆杆的三点弯曲试验中注意到的过早压缩剪切。 弯曲性能可能随试样深度、温度、大气条件和应变率的差异而变化。 在继续使用本试验方法之前，应参考被测材料的规范。材料规范中涵盖的任何试样制备、调节、尺寸或测试参数或其组合应优先于本试验方法中提及的。如果没有材料规范，则默认条件适用。

1.1 This test method covers the determination of the flexural properties of fiber-reinforced pultruded plastic rods. The specimen is a rod with a semicircular cross section, molded or cut from lengths of pultruded rods (see Fig. 1). This test method is designed for rods with a diameter of 1 / 2 in. or greater. Note 1—There is no known ISO equivalent for this test method. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 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 and health practices and determine the applicability of regulatory limitations prior to use. FIG. 1 Cross Section of Test Specimen ====== Significance And Use ====== Flexural properties determined by this test method are especially useful for quality control and specification purposes. The maximum axial fiber stresses occur on a line under the loading nose. The use of the semicircular cross section eliminates premature compression shear that has been noted in three-point flexure tests on full-round rods. Flexural properties may vary with specimen depth, temperature, atmospheric conditions, and differences in rate of straining. Before proceeding with this test method, reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then the default conditions apply.