Cyclic elastic follow-up behavior at elevated temperature. (2nd report. Evaluation of shakedown).

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  • 高温・弾性追従場における繰返し変形挙動　ＩＩ　　弾性追従場におけるシェイクダウン判定基準
  • 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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Abstract

Simplified inelastic methods of analysis are used to reduce the number of locations in a structure requiring detailed inelastic analysis. Three simplified inelastic models are proposed to calculated an inelastic strain range Δεin produced in cyclic elastic follow-up process. Uniaxial cyclic elastic follow-up tests were carried out on SUS 304 steel at 700°C. The analytic model consists of elastic plastic material with/without strain hardening and stress relaxation to σr after a certain period. The parameters needed for analysis of the inelastic strain range Δεin are stress ratios ξ(= σn/σ^-y), ζ(=σr/σy), and an elastic follow-up strain amplification factor p. A dimensionless inelastic strain range can be expressed by Δεin/εy = (1+ζ)(1+p)(ξ-1). The shakedown condition in a structure can satisfy the following requirement ; ξ≤1. Using the relaxed stress based on pure relaxation tests makes the estimation of Δεin/εy more conservative.

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