Determination of elastic modulus of quartz glass using digital speckle pattern interferometry

摘要

A method of measuring whole-field elasticity modulus using digital speckle pattern interferometry is proposed to evaluate the mechanical properties of quartz glass in practical applications. By analyzing the loading conditions of eccentric three-point bending, a new measurement model is established. In the experiments, the maximum relative deviation among the four tests was 5.7%, proving that good measurement repeatability can be achieved. The characteristic of full-field measurement helps the proposed method eliminate measurement errors caused by contact deformation and eccentricity which are widespread in traditional single-point measurement methods. Moreover, the ability of high-accuracy displacement measurement makes the proposed method a valid means of elastic modulus determination for brittle materials.