J0560105 流体温度変動による配管熱疲労に関する研究 : (16)熱成層界面ゆらぎの変動特性が熱応力応答に及ぼす影響([J056-01]エネルギープラント安全に向けた構造/熱流体/材料の連成問題(1))

The oscillation of thermal stratification layer has possibilities to induce thermal fatigue damages on structures of nuclear components. To evaluate thermal stress induced by thermal stratification oscillation, the moving layer frequency response function of thermal stress was developed. However, the model assumed in developing this function does not take into account the thickness of the thermal stratification layer. Thus, It is impossible to evaluate the stress generated by thermal stratified layer having finite thickness with sufficient accuracy. To clarify the effects of thickness of stratified layer, finite element simulations were conducted under some fluid conditions. Based on mechanisms of above effects, the frequency response function was improved.