高温・弾性追従場における繰返し変形挙動　ＩＩＩ　　低合金鋼における弾性追従現象の推定と評価

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  • Cyclic elastic follow-up behavior at elevated temperature. (3rd, report. Elastic follow-up on 2.25Cr-1Mo steel).
  • コウオン ダンセイ ツイジュウバ ニ オケル クリカエシ ヘンケイ キョドウ

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Cyclic elastic follow-up tests were carried out on 2.25 Cr-1 Mo steel at 600°C. The behavior of the relaxed stress and the elastic follow-up strain at the first elastic follow-up process were discussed with simplified inelastic analyses. When the Norton's creep law and a virtual triangle of elastic follow-up were used, it was found that the elastic-creep analytical method was a most useful technique to predict the elastic follow-up response on 2.25 Cr-1 Mo steel, as well as on SUS 304 steel. An inelastic strain range Δεin produced in the cyclic elastic follow-up process was also examined and was compared with an analytical approximation. From analysis and experiments, it was verified that the shakedown condition of a structure can be achieved with simple limitations of an effective relaxed stress after a certain period and an effective yield stress of the material, as defined by the proposed model.

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