本文件规定了一种基于共振曲线的弯曲振动方法，用于确定弯曲复模量E*f？均质塑料和用于隔音的层压塑料的阻尼性能，例如由涂覆有阻尼塑料层的金属板组成的系统，或由具有中间塑料层的两个金属板层组成的夹层系统。出于许多目的，将这些性质确定为温度和频率的函数是有用的。

This document specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus E^*_f？of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation, for example systems consisting of a metal sheet coated with a damping plastic layer, or sandwich systems consisting of two sheet-metal layers with an intermediate plastic layer. For many purposes, it is useful to determine these properties as a function of temperature and frequency.