A-16 超高温下におけるセラミックスの応力-ひずみ応答の計測

概要

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The closed loop type-test systems available at ultra-high temperatures were developed, where special attention was given to the extensometer. Then the tensile stress-strain response, tensile creep behavior and cyclic stress-strain response were investigated for sintered silicon nitride ceramics and cyclic stress-strain response for Si_3N_4/SiCw composite material at elevated temperatures. The great inelastic strain, which is greatly dependent on stress rate, was produced under tensile and cyclic push-pull loadings in Si_3N_4 at 1300℃. It was found that inelastic strain is easier to generate under tensile loading than under compressive one in cyclic loading test; the stress-inelastic strain hysteresis loop was characterized by the fatter shape on the tensile stress side than on the compressive stress side. Furthermore, existence of transient creep stage was clearly exhibited in the creep curves obtained from tensile creep test in Si_3N_4 ceramics at 1300℃. The Si_3N_4/SiCw composite revealed very characteristic stress-strain hysteresis loop at 1300℃; the extremely great difference is found between tensile and compressive stresses required for given strain, which is about three times larger in the latter than in the former.
一般社団法人日本機械学会の論文
2000-03-29