成形過程シミュレーション解析による鏡板子午線方向板厚分布の分析

Evaluation of meridional thickness distribution of a head plate based on forming process simulation analysis

月森 和之*; 矢田 浩基 ; 前田 純一*

Tsukimori, Kazuyuki*; Yada, Hiroki; Maeda, Junichi*

鏡板は原子力プラント機器などにおいてバウンダリを形成する構造物のひとつである。圧力荷重による鏡板の座屈やその後の変形挙動については、鏡板の成形過程において生じる板厚の分布が大きく影響するものと考えられる。そこで、鏡板の特徴的な板厚分布を合理的に把握するために、鏡板の成型過程を模擬したシミュレーション解析を試みた。ここでは既報の結果を分析し、さらに考えられる影響因子を加えて検討を実施し、定性的,定量的に子午線方向板厚分布実測データと符合するよう改善を図った。

In FBR plants the head plate constitutes a part of the boundary of the containment vessel (CV), therefore, it is a very important issue if the function as the boundary is maintained or not in the case of severe accident (SA). Buckling and post-buckling behaviors due to pressure loading must be affected by the thickness distribution of the head plate during press forming process. In this paper non-linear finite element simulation analyses assuming press forming process of a head plate are improved after the previous paper and the discussion is made comparing the analysis results with the measured results of thickness distribution of the head plate specimen used for the pressure endurance test. And also, the modelling for finite element analyses of head plates is discussed. In this study, axisymmetric analyses are implemented focused on the thickness distribution along the meridional direction of the head plate.