1.1 本规程一般用于收集和报告动态机械数据。它结合了实验室实践，用于在通常称为动态机械分析仪或动态热机械分析仪的各种仪器上测定承受各种振荡变形的塑料试样的动态机械性能。 1.2 本规程旨在提供通过自由振动和共振或非共振受迫振动技术确定塑料在一系列温度、频率或时间内的转变温度、弹性模量和损耗模量的方法。弹性模量和损耗模量图表示塑性材料的粘弹性特征。这些模量是塑料中温度或频率的函数，在特定温度或频率下迅速变化。模量快速变化的区域通常称为过渡区域。 1.3 当在以下温度范围内进行时，该实践主要有用: −140°C至聚合物软化，适用于0。 01至1000 Hz。 1.4 本规程适用于弹性模量在0.5 MPa至100 GPa（73 psi至1.5 psi）范围内的材料 × 10 7. psi）。 1.5 当在不同的实验条件下获得时，结果会出现差异。在不改变观察数据的情况下，完整报告（如本实践中所述）获得数据的条件将使在另一项研究中观察到的明显差异得以调和。该技术的假设是在线性粘弹性行为区域进行测试。 1.6 如参考试验方法所列，使用不同的变形模式，如拉伸、弯曲和剪切。 1.7 通过本规程获得的试验数据是相关的，适用于工程设计。 1.8 以国际单位制表示的数值应视为标准值。括号中给出的值仅供参考。 1.9 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。 具体危害说明见第节 8. . 注1: 本规程等同于ISO 6721-1。 1.10 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 动态力学测试提供了一种确定弹性模量和损耗模量随温度、频率或时间或两者的函数变化的方法。材料的弹性模量和损耗模量与温度的关系图分别提供了弹性和阻尼随温度或频率变化的图形表示。 5.2 该程序可用于确定塑料的转变温度，即聚合物分子运动的变化。在发生显著变化的温度范围内，弹性模量随温度升高（恒定或接近恒定频率）迅速下降，或随频率升高（恒定温度）而增加。在过渡区观察到损耗模量以及tan-delta曲线的最大值。 5.3 例如，该程序可用于通过与已知参考材料或对照材料进行比较来评估: 5.3.1 多组分系统中的相分离度， 5.3.2 填料类型、数量、预处理和分散，以及 5.3.3 某些加工处理的效果。 5.4 该程序可用于确定以下各项: 5.4.1 聚合物复合材料的刚度，特别是作为温度的函数， 5.4.2 聚合物结晶度，以及 5.4.3 橡胶改性聚合物橡胶相中三轴应力状态的大小。 5.5 该程序有助于质量控制、规范验收和研究。 5.6 材料规范中的程序修改优先于本惯例。因此，在使用本规程之前，请参阅适当的材料规范。分类系统表1 D4000 列出了当前存在的ASTM材料标准。

1.1 This practice is for general use in gathering and reporting dynamic mechanical data. It incorporates laboratory practice for determining dynamic mechanical properties of plastic specimens subjected to various oscillatory deformations on a variety of instruments of the type commonly called dynamic mechanical analyzers or dynamic thermomechanical analyzers. 1.2 This practice is intended to provide means of determining the transition temperatures, elastic, and loss moduli of plastics over a range of temperatures, frequencies, or time, by free vibration and resonant or nonresonant forced vibration techniques. Plots of elastic and loss moduli are indicative of the viscoelastic characteristics of a plastic. These moduli are functions of temperature or frequency in plastics, and change rapidly at particular temperatures or frequencies. The regions of rapid moduli change are normally referred to as transition regions. 1.3 The practice is primarily useful when conducted over a range of temperatures from −140°C to polymer softening and is valid for frequencies from 0.01 to 1000 Hz. 1.4 This practice is intended for materials that have an elastic modulus in the range from 0.5 MPa to 100 GPa (73 psi to 1.5 × 10 7 psi). 1.5 Discrepancies in results are known to arise when obtained under differing experimental conditions. Without changing the observed data, reporting in full (as described in this practice) the conditions under which the data were obtained will enable apparent differences observed in another study to be reconciled. An assumption of this technique is that testing is conducted in the region of linear viscoelastic behavior. 1.6 Different modes of deformation, such as tensile, bending and shear, are used, as listed in the referenced test methods. 1.7 Test data obtained by this practice are relevant and appropriate for use in engineering design. 1.8 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.9 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. Specific hazards statements are given in Section 8 . Note 1: This practice is equivalent to ISO 6721–1. 1.10 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 Dynamic mechanical testing provides a method for determining elastic and loss moduli as a function of temperature, frequency or time, or both. A plot of the elastic modulus and loss modulus of material versus temperature provides a graphical representation of elasticity and damping as a function of temperature or frequency, respectively. 5.2 This procedure can be used to locate transition temperatures of plastics, that is, changes in the molecular motions of a polymer. In the temperature ranges where significant changes occur, elastic modulus decreases rapidly with increasing temperature (at constant or near constant frequency) or increases with increasing frequency (at constant temperature). A maximum is observed for the loss modulus, as well as for the tan delta curve, in the transition region. 5.3 This procedure can be used, for example, to evaluate by comparison to known reference materials or control materials: 5.3.1 Degree of phase separation in multicomponent systems, 5.3.2 Filler type, amount, pretreatment, and dispersion, and 5.3.3 Effects of certain processing treatment. 5.4 This procedure can be used to determine the following: 5.4.1 Stiffness of polymer composites, especially as a function of temperature, 5.4.2 Degree of polymer crystallinity, and 5.4.3 Magnitude of triaxial stress state in the rubber phase of rubber modified polymers. 5.5 This procedure is useful for quality control, specification acceptance, and research. 5.6 Procedural modifications in material specifications take precedence to this practice. Therefore, consult the appropriate material specification before using this practice. Table 1 of Classification System D4000 lists the ASTM materials standards that currently exist.