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高速炉設計用構成モデルの開発; 多直線移動硬化応力反転リセットモデル

Development of constitutive models for fast breeder reactor design; Multi-linear kinematic hardening model with stress reversal-on resetting

岩田 耕司; 月森 和之; 川崎 信史 ; 矢田 浩基 ; 笠原 直人

Iwata, Koji; Tsukimori, Kazuyuki; Kawasaki, Nobuchika; Yada, Hiroki; Kasahara, Naoto

弾完全塑性モデルや2直線弾塑性モデルに比べて、実際の材料挙動により近い、理想化された非線形弾塑性モデルとして、多直線移動硬化応力反転リセットモデルを提案した。本モデルは、熱ラチェットひずみを安全側に予測する手段として利用できる可能性があることが示された。

A multilinear kinematic hardening model with stress reversal-on resetting is proposed as an idealized nonlinear elastic-plastic model which can represent material behavior more realistically than conventional models such as elastic perfectly plastic model, or bilinear elastic plastic model. The results of analyses for a uniaxial cyclic material behavior test and a two-bar thermal ratcheting test suggested the possibility that this model could be used in structural design of fast breeder reactors to predict thermal ratchet strain conservatively.

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