Dynamic elastic modulus testing machine

Introducation

The elastic modulus(Young's modulus) is an important performance parameter of engineering materials. It is an important mechanical parameter to characterize the elastic properties of solid materials. The elastic modulus is measured in G/Pa. Elastic modulus testers are widely used in the testing and detection of various solid materials such as metals, ceramics, building materials, refractory materials, graphite, carbon, glass, coatings, etc.

Currently, the most popular method for testing elastic modulus in the world is the dynamic testing method-pulse excitation method, which can test the Shear modulus, Young's modulus, Poisson's ratio, damping ratio, etc. The method have the advantage of easy operation, high precision, small man-made error, and reusing of sample.

The basic principle of the pulse excitation method is to use a pulse exciter to excite a rectangular cross-section sample and measure the bending or torsion response frequency of the sample. This tester causes free vibration of the sample by stimulating instantaneously (hitting by a manual hammer) on the sample. The vibration signal is collected by the signal receiver above the sample, and transmitted to the computer through Fourier transformation, which can obtain the frequency of free vibration. The Young's modulus E, shear modulus G and Poisson's ratio U are calculated by using the fundamental frequency of bending vibration and the main frequency of torsion. The dynamic elastic modulus tester can accurately measure and analyze the vibration frequency of the sample and derive the elastic properties.

The testing instrument mainly includes: sample support frame, pulse exciter, signal receiving sensor, signal amplifier, signal collector, data analysis system, etc.