1.1 本试验方法包括测定直径为19至32 mm的拉挤玻璃纤维增强热固性塑料棒的平面内剪切强度( 3. / 4. 至1 1. / 4. 英寸）。 1.2 以国际单位制表示的数值应视为标准。 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。 具体预防说明见 注释2 和 附注3 . 注1: 没有已知的ISO等效于本标准。 ====意义和用途====== 5.1 各种剪切试验广泛用于增强塑料行业，以评估聚酯、乙烯基酯和环氧树脂复合材料中增强材料与树脂的粘结强度。除了对生成用于研究和开发、质量控制和规范目的的数据的重要性外，此类测试对纤维增强工业具有根本价值，因为它们可以用于确定玻璃纤维表面处理的新型施胶系统的潜力。 5.2 从工程角度来看，拉挤圆柱复合材料的面内剪切强度是一个重要的性能，因为拉挤杆本身在许多结构应用中都有使用。

1.1 This test method covers the determination of the in-plane shear strength of pultruded, glass-fiber reinforced, thermosetting plastic rod of diameters ranging from 19 to 32 mm ( 3 / 4 to 1 1 / 4 in.). 1.2 The values stated in SI units are to be regarded as 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. Specific precautionary statements are given in Note 2 and Note 3 . Note 1: There is no known ISO equivalent to this standard. ====== Significance And Use ====== 5.1 Shear tests of various kinds are widely used in the reinforced plastics industry to assess the strength of the reinforcement-to-resin bond in polyester-, vinyl ester-, and epoxy-resin composites. In addition to their importance for the generation of data for research and development, quality control, and specification purposes, such tests are of fundamental value to the fibrous reinforcement industry, since they can be used to determine the potential of new sizing systems for the surface treatment of glass fibers. 5.2 The in-plane shear strength of pultruded cylindrical composites is an important property from an engineering standpoint, since pultruded rod, as such, is used in many structural applications.