Abstract
The tensile and compressive stress-strain responses and cyclic stress-strain response were investigated for sintered silicon nitride ceramics at elevated temperatures, using the ultra-high temperature-use- extensometer which was developed in the authors' laboratory. The large inelastic strain, which is greatly dependent on stress rate, was produced under tensile, compressive and cyclic push-pull triangular wave loadings in this material at 1300℃. Furthermore, inelastic strain decreases with increase in the number of loading cycles at 1300℃, showing increase in resistance to deformation in cyclic loading process. It was found from these tests that inelastic strain is easier to generate under tensile loading than under compressive loading.
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