高温・弾性追従場における繰返し変形挙動 : 第2報,弾性追従場におけるシェイクダウン判定基準

概要

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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 Δε_<in> produced in cyclic elastic follow-up process. Uniaxial cyclic elastic follow-up tests were carried out on SUS 304 steel at 700℃. The analytic model consists of elastic plastic material with/without strain hardening and stress relaxation to σ_r after a certain period. The parameters needed for analysis of the inelastic strain range Δε_<in> are stress ratios ξ(= σ_n/σ^^-_y), ζ(=σ_r/σ_y), and an elastic follow-up strain amplification factor p. A dimensionless inelastic strain range can be expressed by Δε_<in>/ε_y = (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 Δε_<in>/ε_y more conservative.
社団法人日本機械学会の論文
1987-09-25