ISO 6721-8:2019 塑料 动力机械性能的测定 第8部分： 纵向和剪切振动 波传播法

标准编号：ISO 6721-8:2019

中文名称：塑料 动力机械性能的测定 第8部分： 纵向和剪切振动 波传播法

英文名称：Plastics — Determination of dynamic mechanical properties — Part 8: Longitudinal and shear vibration — Wave-propagation method

发布日期：2019-04

标准范围

本文件描述了一种超声波传播方法，用于在离散频率（通常在0.5 MHz至5 MHz范围内）下测定聚合物的纵向复模量L*和剪切复模量G*的存储分量。该方法适用于测量存储模量在0.01 GPa至200 GPa范围内，损耗系数在1 MHz左右时低于0.1的材料。对于损耗较高的材料，通过波形畸变引入速度测量中的重大误差，只能使用本文件范围之外的程序来减少。该方法允许在小样本（通常为50 mm×20 mm×5 mm）或较大样本或板材的小区域上进行测量。因此，可以获得试样中模量的均匀性或各向异性（见10.5）信息。

This document describes an ultrasonic wave propagation method for determining the storage components of the longitudinal complex modulus L* and the shear complex modulus G* of polymers at discrete frequencies typically in the range 0,5 MHz to 5 MHz. The method is suitable for measuring materials with storage moduli in the range 0,01 GPa to 200 GPa and with loss factors below 0,1 at around 1 MHz. With materials that have a higher loss, significant errors in velocity measurement are introduced through waveform distortion and can only be reduced using procedures that are outside the scope of this document.The method allows measurements to be made on small specimens, typically 50 mm × 20 mm × 5 mm, or small regions of larger specimens or sheets. It is therefore possible to obtain information on the homogeneity or anisotropy (see 10.5) of modulus in a specimen.

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