Measurement of the Elastic Modulus for Brittle Materials by the Dynamic Method : An Investigation for Applying Specimens of Thin Beam

Abstract

There are generally two methods, static and dynamic, for measuring an elastic modulus. However, for brittle materials, the static method was less accurate in measurement than the dynamic method because destruction occurred even before much strain was applied. In this paper, the elastic modulus was measured using ultrasonic waves propagating inside the specimen by the pulse sine wave potentiometer and oscilloscope and by the applied ultrasonic wave pulse superimpose method to calculate various elasticities. Further, the above method was applied for a thin specimen of soda lime glass and Young's modulus was measured. As a result, comparing the values measured by the deflection method to that of the static method, there were differences of about 3-8% between measurement values of both methods.