716 超高温下における窒化けい素セラミックスの応力-ひずみ応答に及ぼす応力波形の影響

概要

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The tensile stress-strain response 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 and cyclic push-pull triangular wave loadings in this material at 1300℃. Furthermore, the creep strain was measured during stress hold period under the cyclic trapezoidal wave loading at 1300℃, which is larger on the tensile stress side than on the compressive side. It was found from these tests 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.
一般社団法人日本機械学会の論文
2000-07-31