Theory

The impulse excitation technique (IET) is a non-destructive process for characterizing the elastic moduli and internal friction of homogenous materials. The measurement is carried out through tapping the sample with a small impulser and recording the induced vibration signal with a sensor. Hereafter, the recorded vibration signal in the time domain is converted to the frequency domain by a fast Fourier transformation. In our instrument, we design a dedicated software for determining the resonant frequency with high accuracy to calculate the elastic moduli based on the classical beam theory.

Standards

- ASTM E1876-15: Standard Test Method for Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio by Impulse Excitation of Vibration

- ASTM C1259-15: Standard Test Method for Dynamic Young’s Modulus, Shear Modulus, and Poisson’s Ratio for Advanced Ceramics by Impulse Excitation of Vibration

- ASTM C1548-02(2012): Standard Test Method for Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio of Refractory Materials by Impulse Excitation of Vibration

- ISO 12680-1:2005: Methods of test for refractory products - Part 1: Determination of dynamic Young's modulus (MOE) by impulse excitation of vibration

- EN 843-2:2006: Advanced technical ceramics - Mechanical properties of monolithic ceramics at room temperature - Part 2: Determination of Young's modulus, shear modulus and Poisson's ratio