常圧焼結窒化けい素セラミックスの高温引張クリープ変形

概要

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The tensile creep tests were performed on sintered silicon nitride ceramics at 1300℃, using the tensile creep specimen with the four projections which work as targets for the laser beam. Then the creep displacement was measured by means of the laser-beam-type displacement measuring system. The creep curve of the ceramics exhibited the steady creep period following the transient crrep period. The relationship between minimum creep strain rate ε_c and nominal stress σ was expressed by the straight line on double logarithmic scale. The creep deformation occurring in the specimen with the projections was calculated through the finite element method, where the measured ε_c-σ relationship was introduced as the basic material constitutive equation. The relationship between ε_c and σ calculated from the displacement between the two projections through FEM analysis was in good agreement with the above material constitutive equation. It was suggested from this and the FEM calculation on the progress of the creep deformation that the ε_c-σ relationship obtained from he displacement measured between the two projections expressed the correct creep property of the ceramics.
一般社団法人日本機械学会の論文
1995-04-25