Abstract
A novel test specimen geometry is proposed for quantitatively analyzing the creep deformation and the stress relaxation behavior of engineering ceramics at elevated temperatures. The specimen precisely yields a simple shear deformation under a compressive loading mode. The simple shear is the most essential deformation for time dependent rheological studies, because the conventional test specimen geometries such as flexural or tensile test geometries inevitably induce the volume change within the test specimen under load, leading to complicated nonlinear deformation. The present novel geometry is applied to the high-temperature deformation and flow of soda-lime glass to confirm the potential use for studies on the high-temperature rheology of engineering ceramics. A critical review is also made for some issues, problems and difficulties included in the conventional rheological approaches to the high-temperature deformation of ceramic materials.
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