べき乗型非弾性ひずみ則に従う物体中における弾性追従挙動と変位制御荷重下ピークひずみ・ピーク応力緩和の簡易評価法

摘要

In the assessment of structural integrity and remaining life of a power component operated at high temperatures, creep-fatigue damage evaluation is frequently required. When evaluating creep-fatigue damage, peak strain range and relaxation history of peak stress in the component are needed to estimate. These stresses and strains are, in many cases, generated by secondary stresses. Fully inelastic finite element stress analysis may provide the necessary information on these. Performance of and preparations for this kind of analysis are, however, usually laboring and costly. This paper in vestigates elastic follow-up behaviors in components subjected to displacement-controlled loading, and proposes simplified methods to assess peak strain and relaxation history of peak stress basically from elastic stress analysis. The methods are based on the nature of elastic follow-up factors of power law type inelastic bodies.%発電用高温機器の健全性評価・余寿命評価にあたっrnてクリープ疲労損傷の評価を要することがある．このrnためには熱応力等の二次応力によるピークひずみ範rn囲およびクリープ中ピーク応力の緩和履歴を推定すrnる必要がある．