1.1本试验方法测量材料的振动阻尼特性:损耗系数， η ，和杨氏模量， E ，或剪切模量， G . 该方法在50至5000 Hz的频率范围和材料的有效温度范围内准确，适用于测试在结构振动、建筑声学和可闻噪声控制中应用的材料。此类材料包括金属、搪瓷、陶瓷、橡胶、塑料、增强环氧树脂基体和可形成悬臂梁试样结构的木材。 1.2 本标准无意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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 阻尼材料的材料损耗系数和模量在设计措施以控制结构中的振动和这些结构辐射的声音，特别是共振时，非常有用。该试验方法通过使用阻尼悬臂梁理论进行间接测量来确定阻尼材料的特性。通过应用梁理论，合成的阻尼材料特性与用于获得它们的试样的几何形状无关。然后，可以将这些阻尼材料特性与数学模型一起用于设计阻尼系统，并在硬件制造之前预测其性能。这些模型包括简单的梁和板模拟以及有限元分析模型。 当用于测试由一个均质层组成的材料时，发现该试验方法产生了良好的结果。 在某些阻尼应用中，阻尼设计可能由两个或更多具有显著不同特性的层组成。如果要使数学模型的预测具有尽可能高的精度，这些复杂的设计必须对其组成层进行单独测试。

1.1 This test method measures the vibration-damping properties of materials: the loss factor, η , and Young's modulus, E , or the shear modulus, G . Accurate over a frequency range of 50 to 5000 Hz and over the useful temperature range of the material, this method is useful in testing materials that have application in structural vibration, building acoustics, and the control of audible noise. Such materials include metals, enamels, ceramics, rubbers, plastics, reinforced epoxy matrices, and woods that can be formed to cantilever beam test specimen configurations. 1.2 This standard does not purport to address all the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== The material loss factor and modulus of damping materials are useful in designing measures to control vibration in structures and the sound that is radiated by those structures, especially at resonance. This test method determines the properties of a damping material by indirect measurement using damped cantilever beam theory. By applying beam theory, the resultant damping material properties are made independent of the geometry of the test specimen used to obtain them. These damping material properties can then be used with mathematical models to design damping systems and predict their performance prior to hardware fabrication. These models include simple beam and plate analogies as well as finite element analysis models. This test method has been found to produce good results when used for testing materials consisting of one homogeneous layer. In some damping applications, a damping design may consist of two or more layers with significantly different characteristics. These complicated designs must have their constituent layers tested separately if the predictions of the mathematical models are to have the highest possible accuracy.