1609 応力再配分軌跡法による高温局所部位の非弾性挙動推定(OS16-3 核融合炉-多種多様な力学的環境における強度・設計問題)

概要

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Stress redistribution locus (SRL) method has been proposed to provide a reasonable estimate of stress and strain condition and behavior at specific points employing both the elastic Finite Element analysis and a unique hyperbolic curve: ε^^-= {1/σ^^- + (κ-1) σ^^-}/κ, where ε^^- and σ^^- show dimensionless equivalent strain and stress normalized by the elastic FEA result FE analyses incorporating plasticity and creep in were performed for a plate with a single notch where membrane, bending and peak stresses appeared at the same time. The normalized equivalent stress and strain behavior was compared with proposed SRL curves. Both at smaller deformation under monotonic loadings and at the early time under creep conditions the normalized stress and strain behavior traced the SRL curve of κ=1.6. However with the larger deformation and as time went by, the stress and strain locus went away from the SRL curve of κ=1.6, and approached to the one of κ=1.0. This tendency is more remarkable in plane strain analyses than in plain stress ones.
一般社団法人日本機械学会の論文
2010-10-09