1.1 本试验方法涵盖使用以下试样进行的动态撕裂（DT）试验: 3. / 16 在里面到 5. / 8. 在里面（5 mm至16 mm），包括厚度。 1.2 本试验方法适用于最小厚度为 3. / 16 在里面（5毫米）。 1.3 用于锐化缺口尖端的压刀程序通常将本试验方法限制在硬度水平低于36 HRC的材料上。 注1: 名称36 HRC是试验方法中定义的洛氏C标尺上36的洛氏硬度值 E18 . 1.4 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 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。 1.6 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 DT能量值是对快速渐进压裂阻力的测量。 在许多应用中，主要关注的是在大约一个板厚的裂纹从尖锐缺口扩展期间可能产生的增强阻力。在试验方法中，提供了足够长的断裂路径，因此结果可作为该特性的衡量标准。 5.2 在温度过渡区测试的非奥氏体钢的断裂表面有亮区和暗区。明亮、多面出现的区域被称为“解理”断裂，而暗淡出现的区域在微观尺度上各自的断裂模式后被称为“剪切”断裂。 5.3 本试验方法可用于以下目的: 5.3.1 在研究和开发中，评估冶金变量（如成分、加工或热处理）或制造操作（如成型和焊接）对新材料或现有材料动态抗撕裂断裂性能的影响。 5.3.2 在使用评估中，仅在DT能量和使用性能之间建立了相关性的情况下，确定材料对特定应用的适用性。 3. 5.3.3 信息、验收规范和要求最小DT能量时的制造质量控制。在特定情况下确定此类最小值的基础的详细讨论超出了本试验方法的范围。

1.1 This test method covers the dynamic tear (DT) test using specimens that are 3 / 16 in. to 5 / 8 in. (5 mm to 16 mm) inclusive in thickness. 1.2 This test method is applicable to materials with a minimum thickness of 3 / 16 in. (5 mm). 1.3 The pressed-knife procedure described for sharpening the notch tip generally limits this test method to materials with a hardness level less than 36 HRC. Note 1: The designation 36 HRC is a Rockwell hardness number of 36 on Rockwell C scale as defined in Test Methods E18 . 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 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 The DT energy value is a measure of resistance to rapid progressive fracturing. In a number of applications, the enhanced resistance that may develop during about one plate thickness of crack extension from a sharp notch is of major interest. In the test method, a sufficiently long fracture path is provided so that the results serve as a measure of this property. 5.2 Fracture surfaces of nonaustenitic steels tested in their temperature transition region have areas that appear bright and areas that appear dull. The bright, faceted appearing areas are termed “cleavage” fracture, and the dull appearing areas are termed “shear” fracture after their respective mode of fracture on a micro scale. 5.3 This test method can serve the following purposes: 5.3.1 In research and development, to evaluate the effects of metallurgical variables such as composition, processing, or heat treatment, or of fabricating operations such as forming and welding on the dynamic tear fracture resistance of new or existing materials. 5.3.2 In service evaluation, to establish the suitability of a material for a specific application only where a correlation between DT energy and service performance has been established. 3 5.3.3 For information, specifications of acceptance, and manufacturing quality control when a minimum DT energy is requested. Detailed discussion of the basis for determining such minimum values in a particular case is beyond the scope of this test method.