Abstract
Elastic and viscoelastic shear strains induced in test specimens with double-shear geometry are measured by extending the conventional uniaxial speckle extensometry. The test results for soda-lime glass give excellent agreements with the shear modulus G at room temperature and the shear viscosity η reported in the literature at temperatures from 530 to 555°C. The G and η values are also in agreement with those measured by a strain-gage foil and by an electro-optical extensometer, respectively. This agreement confirms that the proposed technique and analysis for the measurement of shear strain with a uniaxial laser speckle strain meter are not only applicable for characterizing the mechanical properties of brittle materials in a small scale deformation, but also provide a powerful tool for studying the high-temperature deformation and flow of engineering materials in a large scale deformation. The issue of affine transformation of polycrystalline materials with local heterogeneity and anisotropy is also discussed by comparing the test results of speckle and electro-optical extensometries.
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