OS0735 応力再配分軌跡法による熱過渡容器ノズルの非弾性変形挙動の推定(構造用材料の疲労挙動と寿命評価,オーガナイズドセッション)

概要

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Stress redistribution locus (SRL) method has been proppsed to provide a reasonable estimate_employing the elastic FEM analysis and a unique hyperbolic curve: ε= {1/σ + (κ - 1) σ}/κ, whereε and σ show the dimensionless equivalent strain and stress normalized by the elastic FEM result, respectively. FEM analyses incorporating plasticity and creep in are performed for a tapered nozzle in reactor vessel with thermal transient along the thickness. The normalized equivalent stress and strain curves are compared with the SRL. Calculation results reveal that the coefficient κ is larger than the conventional one, but its criterion guarantees the robust structure for complicated components even if involving inelastic deformation.
2009-07-24