1.1 本试验方法涵盖了测定厚度为1.27至12.7毫米（0.050至0.500英寸）的片材、板材和模制形状的塑料剪切强度的程序。 1.2 以国际单位制表示的值应被视为标准。括号中给出的值仅供参考。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 注1: 目前还没有与该标准等效的ISO。 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====== 4.1 通过使用冲头型工具获得的剪切强度是比较材料或为工程设计目的获取数据或两者兼而有之的公认方法之一。 然而，必须认识到，对于最终用途应用，该测试方法中可能有许多因素没有考虑在内，例如应力集中几何形状和剪切速率，这些因素会深刻影响测量的剪切强度。此外，剪切强度是通过将载荷除以剪切边缘的面积（冲头周长）来计算的 十、 试样厚度）不解释为表明如此获得的抗剪强度值仅是一种材料属性，与厚度无关。 4.2 对于许多材料，可能有一个规范要求使用这种测试方法，但在遵守规范时，需要进行一些程序修改。因此，建议在使用此测试方法之前参考该材料规范。分类系统表1 4000美元 列出了目前存在的ASTM材料标准。

1.1 This test method covers the procedure for determining the shear strength of plastics in the form of sheets, plates, and molded shapes in thicknesses from 1.27 to 12.7 mm (0.050 to 0.500 in.). 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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. Note 1: There is no known ISO equivalent to this standard. 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 ====== 4.1 Shear strength obtained by the use of punch-type tooling is one of the recognized methods of comparing materials, or obtaining data for engineering design purposes, or both. However, it must be recognized that for end-use applications there are likely to be many factors not taken into account in this test method, such as stress-concentrating geometries and rates of shear, which can profoundly affect the measured shear strength. Moreover, the fact that the shear strength is calculated by dividing the load by the area of the sheared edge (punch circumference X specimen thickness) does not interpret as indicating the shear strength value so obtained is solely a material property, independent of thickness. 4.2 For many materials, it is possible that there is a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Table 1 of Classification System D4000 lists the ASTM materials standards that currently exist.