Sonelastic® is a line of solutions for nondestructive characterization of elastic modulus and damping of materials by the natural frequencies obtained by impulse excitation technique.
The Sonelastic® Solutions is also applied to quality control of parts, components and materials via acoustic signature, which changes with the presence of cracks, pores and deviations of mechanical properties.
The Sonelastic® Solutions are in agreement with the ASTM E1876, C1259, C215 and correlated (for both room temperature and for high and low temperatures) being suitable for the characterization of a wide range of materials.
In the following figure is presented an overview of the technologies employed, the sample holders and the optional for automatic measurements and in high temperatures.
In the technique of the impulse excitation, the elastic modulus and damping are calculated from the sound emitted by the specimen when suffer a small stroke. This sound or acoustic response is composed of the natural frequencies of vibration of the specimen that are proportional to the elastic modulus, and its amplitude declines according to the damping of material.
For simple geometries, such as bar, cylinder, disc and plate, there is a direct relationship between the natural frequencies of vibration with the dimensions and mass of the specimen. Knowing the dimensions, mass and natural frequencies of vibration, the calculation of elastic modulus is immediate.
For the characterization, the specimen must be positioned and supported by an adequate sample holder.
Being properly positioned, the specimen is excited by a small stroke via an actuator that can be manual or automatic (electromagnetic impulser).
The acoustic response is captured by an acoustic sensor and processed by software (PC Based technology) or hardware (Stand Alone technology), which calculates the elastic modulus and damping from the natural frequencies of vibration (resonance frequencies).
The damping is calculated by the logarithmic decrement method from the signal attenuation rate.
Sonelastic solutions allow you to perform tests according to the following standards:
ASTM E1876 - 09 Standard Test Method for Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio by Impulse Excitation of Vibration
ASTM C1259 - 08e1 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(2007) Standard Test Method for Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio of Refractory Materials by Impulse Excitation of Vibration
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