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Elastic Modulus Of Refractory Materials
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The elastic modulus, also called Young's modulus, is defined as the change in stress with an applied strain. It is one of the important mechanical parameters of the refractory material.
Elastic modulus is used to measure an object or substance's resistance to being deformed elastically (i.e., non-permanently) when a force is applied to it. Its value is the ratio of the normal stress and strain on the cross-section of the sample. It indicates the deformation resistance of the material. It is related to the strength, deformation and fracture of the material.
The measurement method of the elasticity modulus of refractories include static and dynamic methods. The static method includes direct drawing method (also known as the payload weight method), the resistance strain method, the bending deflection method and flexibility correction method. The dynamic method includes ultrasonic method, resonance method, audio method (hammering method).
The most common method used for the measurement of refractory materials is the audio method. Since the natural vibration frequency of a certain elastomer depends on its shape, bulk density and elastic modulus, if the shape and the bulk density of the sample is known, the elastic modulus can be obtained by measuring the natural vibration frequency. The natural vibration frequency is measured by stimulaing one end of the sample with an audio oscillator with continuously variable frequency.
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