1.1 本试验方法涵盖使用动态机械仪器收集和报告热塑性树脂和热固性树脂以及复合材料系统的粘弹性性能，其形式为直接模制或从板材、板材或模制形状上切割的矩形试样。产生的扭转数据可用于识别塑料材料或组合物的热机械性能。 1.2 本试验方法旨在提供使用非共振强迫振动技术确定塑料扭转模量随温度变化的方法，如实践中所述 D4065 . 弹性（储能）、损耗（粘性）、复模量和tanδ随频率、时间或温度变化的曲线图表明聚合物材料系统的热机械性能发生了显著变化。 1.3 该测试方法适用于广泛的频率范围，通常为0.01至100 Hz。 1.4 在不同的实验条件下获得的结果可能会出现明显差异。通过完整报告（如本试验方法所述）获得数据的条件，通常可以在不改变观察数据的情况下，调和与另一项研究中观察到的结果的这些明显差异。 1.5 通过本试验方法获得的试验数据相关且适用于工程设计。 1.6 以国际单位制表示的数值应视为标准值。 1.7 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。 注1: 本试验方法等同于ISO 6721，第7部分。 1.8 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 该试验方法提供了表征塑料材料热机械性能的简单方法。获得的数据可用于质量控制、研究和开发以及建立最佳加工条件。 5.2 动态力学测试通过测量弹性模量和损耗模量作为频率、温度或时间的函数，为确定热机械特性提供了一种灵敏的方法。 材料的模量和tanδ与温度的关系图提供了指示物理和机械性能、固化有效性（热固性树脂系统）和特定条件下阻尼行为的图形表示。 5.3 该测试方法可用于评估 5.3.1 模量随温度的变化， 5.3.2 模量是频率的函数， 5.3.3 加工处理的影响，包括方向， 5.3.4 相对树脂行为特性，包括固化和阻尼， 5.3.5 基板类型和方向（制造）对弹性模量的影响，以及 5.3.6 配方添加剂可能影响加工性能或性能的影响。 5.4 在继续使用本试验方法之前，应参考被测材料的规范。相关ASTM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。 如果没有相关的ASTM材料规范，则默认条件适用。

1.1 This test method covers the use of dynamic mechanical instrumentation for gathering and reporting the viscoelastic properties of thermoplastic and thermosetting resins and composite systems in the form of rectangular specimens molded directly or cut from sheets, plates, or molded shapes. The torsional data generated may be used to identify the thermomechanical properties of a plastics material or composition. 1.2 This test method is intended to provide means for determining the torsional modulus of plastics as a function of temperature using nonresonant forced-vibration techniques, as outlined in Practice D4065 . Plots of the elastic (storage), loss (viscous), and complex moduli and tan delta, as a function of frequency, time, or temperature are indicative of significant transitions in the thermomechanical performance of the polymeric material system. 1.3 This test method is valid for a wide range of frequencies, typically from 0.01 to 100 Hz. 1.4 Apparent discrepancies may arise in results obtained under differing experimental conditions. These apparent differences from results observed in another study can usually be reconciled without changing the observed data by reporting in full (as described in this test method) the conditions under which the data were obtained. 1.5 Test data obtained by this test method are relevant and appropriate for use in engineering design. 1.6 The values stated in SI units are to be regarded as standard. 1.7 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: This test method is equivalent to ISO 6721, Part 7. 1.8 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 provides a simple means of characterizing the thermomechanical behavior of plastics material. The data obtained may be used for quality control, research and development, and establishment of optimum processing conditions. 5.2 Dynamic mechanical testing provides a sensitive method for determining thermomechanical characteristics by measuring the elastic and loss moduli as a function of frequency, temperature, or time. Plots of moduli and tan delta of a material versus temperature provide graphical representations indicative of physical and mechanical properties, effectiveness of cure (thermosetting resin system), and damping behavior under specified conditions. 5.3 This test method can be used to assess 5.3.1 The modulus as a function of temperature, 5.3.2 The modulus as a function of frequency, 5.3.3 The effects of processing treatment, including orientation, 5.3.4 Relative resin behavioral properties, including cure and damping, 5.3.5 The effects of substrate types and orientation (fabrication) on elastic modulus, and 5.3.6 The effects of formulation additives that might affect processability or performance. 5.4 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 relevant ASTM materials specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM materials specifications, then the default conditions apply.