密度変化率とボイド面積比による工業用純アルミニウムの第3次クリープ損傷評価

概要

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The purpose of this paper is to evaluate creep damage along creep curves quantitatively. The present design code for the structures in high-temperature service strictly prohibits use of materials in tertiary creep. However, the creep properties of newly developed heat-resistant materials are characterized by the larger proportion of tertiary creep to creep curves. Using commercially pure alminium, creep damage was measured as a function of change in density (-ΔD/D), and as that of the ratio of creep void area to total area (A_<void>/A). Each value is expressed as a power law of creep strain ε_c in the range of the latter secondary creep section to tertiary creep. Although they were dependent on the magnitude of initial stresses, the relationship between dimensionless values of change in density and creep strain against their values at rupture can be reduced to a curve despite change in stress.
社団法人日本機械学会の論文
1991-07-25