811 高温下における常圧焼結窒化けい素セラミックス切欠材の非弾性解析

概要

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The stress rate-controlled tensile tests were performed for notched specimens of the sintered silicon nitride ceramics with projections at 1300℃. Then the displacements were measured by means of the laser-beam-type displacement measuring system. It was shown from the tests that inelastic deformation was easier to generate at lower stress rate. The constitutive equation was constructed on the basis of tensile stress-strain curves on the smooth specimens presented in the authors' earlier paper, and the inelastic FEM analysis was performed for the smooth and notched specimens, using this equation. These calculations slightly underestimated yield stress of the notched specimen. It, however, was shown that the analytical method proposed in the present study was useful for analyzing the inelastic deformation behavior of notched specimens in Si_3N_4 ceramics at 1300℃.
2000-07-31