1.1 本试验方法概述了使用动态机械仪器来测定和报告热塑性和热固性树脂以及直接成型或从片材、板材或成型形状切割而成的矩形棒形式的复合材料系统的粘弹性。生成的弹性模量数据用于识别塑料材料或组合物的热机械性能。 1.2 该试验方法旨在提供一种方法，用于使用非共振、强制- 实践中概述的振动技术 D4065 特别地，该方法确定了使用已知的双悬臂梁弯曲布置来测量特性的程序。弹性（储存）模量、损耗（粘性）模量和复模量以及tanδ作为频率、时间或温度的函数的曲线图指示了聚合物材料系统的热机械性能的显著转变。 1.3 该测试方法适用于广泛的频率范围，通常为0.01 Hz至100 Hz。 1.4 通过这种测试方法获得的测试数据是相关的，适合在工程设计中使用。 1.5 以国际单位制表示的数值应视为标准。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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: 目前还没有与该标准等效的ISO。 1.7 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====== 5.1 该测试方法提供了一种简单的方法来表征使用非常少量材料的塑料组合物的热机械行为。由于使用了小的试样几何形状，因此试样必须具有被测材料的代表性。所获得的数据可用于质量控制和/或研发目的。对于某些类别的材料，如热固性材料，它也可用于建立最佳加工条件。 5.2 动态机械测试通过测量作为频率、温度或时间函数的弹性模量和损耗模量，为确定热机械特性提供了一种灵敏的手段。 材料的模量和tanδ与这些变量的关系图可用于提供指示功能特性、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。 5.2.1 观察到的数据是特定于实验条件的。完整报告（如本测试方法所述）获得数据的条件对于帮助用户解释数据——调和明显或感知的差异至关重要。 5.3 此测试方法可用于评估以下内容: 5.3.1 作为温度或老化或两者的函数的模量， 5.3.2 作为频率函数的模量， 5.3.3 加工处理的影响，包括取向、诱导应力以及物理和化学结构的降解， 5.3.4 树脂的相对行为特性，包括固化和阻尼， 5.3.5 衬底类型和取向（制造）对弹性模量的影响， 5.3.6 可能影响可加工性或性能的制剂添加剂的作用， 5.3.7 退火对模量和玻璃化转变温度的影响， 5.3.8 纵横比对纤维增强材料模量的影响，以及 5.3.9 填料、添加剂对模量和玻璃化转变温度的影响。 5.4 在进行此测试方法之前，请参阅被测试材料的规范。相关ASTM材料规范中涵盖的任何试样制备、处理、尺寸或试验参数，或其组合，应优先于本试验方法中提及的试样。如果没有相关的ASTM材料规范，则默认条件适用。

1.1 This test method outlines the use of dynamic mechanical instrumentation for determining and reporting the viscoelastic properties of thermoplastic and thermosetting resins and composite systems in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes. The elastic modulus data generated is used to identify the thermomechanical properties of a plastics material or composition. 1.2 This test method is intended to provide a means for determining the viscoelastic properties of a wide variety of plastics using nonresonant, forced-vibration techniques as outlined in Practice D4065 . In particular, this method identifies the procedures used to measure properties using what is known as a dual-cantilever beam flexure arrangement. Plots of the elastic (storage) modulus, loss (viscous) modulus, and complex modulus, and tan delta as a function of frequency, time, or temperature are indicative of significant transitions in the thermomechanical performance of the polymeric material systems. 1.3 This test method is valid for a wide range of frequencies, typically from 0.01 Hz to 100 Hz. 1.4 Test data obtained by this test method are relevant and appropriate for use in engineering design. 1.5 The values stated in SI units are to be regarded as standard. 1.6 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. 1.7 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 plastic compositions using a very small amount of material. Since small test specimen geometries are used, it is essential that the specimens be representative of the material being tested. The data obtained can be used for quality control and/or research and development purposes. For some classes of materials, such as thermosets, it can also be used to establish optimum processing conditions. 5.2 Dynamic mechanical testing provides a sensitive means 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 these variables can be used to provide a graphic representation indicative of functional properties, effectiveness of cure (thermosetting-resin systems), and damping behavior under specified conditions. 5.2.1 Observed data are specific to experimental conditions. Reporting in full (as described in this test method) the conditions under which the data was obtained is essential to assist users with interpreting the data an reconciling apparent or perceived discrepancies. 5.3 This test method can be used to assess the following: 5.3.1 The modulus as a function of temperature or aging, or both, 5.3.2 The modulus as a function of frequency, 5.3.3 The effects of processing treatment, including orientation, induced stress, and degradation of physical and chemical structure, 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, 5.3.6 The effects of formulation additives that might affect processability or performance, 5.3.7 The effects of annealing on modulus and glass transition temperature, 5.3.8 The effect of aspect ratio on the modulus of fiber reinforcements, and 5.3.9 The effect of fillers, additives on modulus and glass transition temperature. 5.4 Before proceeding with this test method, refer 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 material specification shall take precedence over those mentioned in this test method. If there are no relevant ASTM material specifications, then the default conditions apply.