CFETR外真空杜瓦在地震事故下的结构安全分析

Structural safety analysis of CFETR cryostat under seismic accident

基于CFETR外真空杜瓦的全尺寸工程设计模型,采用等效加速度静力学分析方法模拟了杜瓦在SL1、SMHV、SL2三种地震事故下的应力分布和变形情况。结果表明,杜瓦在整个圆周上变形均匀,底座处最大约60 mm;壳体承受大气压作用出现较大的膜应力,而支撑部件中弯曲应力为主,各工况下的最大应力均未超出双标304/304L不锈钢的许用应力,验证了杜瓦结构的合理性与安全性,为后续的设计优化与工程制造提供参考。

Structural analysis of CFETR cryostat was performed based on its full-size engineering design model under seismic accidents of SL1(seismic level 1),SMHV(Séismes maximaux historiquement vraisemblables)and SL2(seismic level 2)by the equivalent acceleration method.The results show that the deformation is relatively uniform on the whole circumference,with an inner concave of about 60 mm in the center of base section.Under the influence of atmospheric pressure,the shell components bear high membrane stress,while the supporting components mainly bear large bending stress.The safety assessment demonstrates that the maximum stress does not exceed the allowable stress of double-standard 304/304L stainless steel in each seismic condition,which verifies the rationality and safety of cryostat structure and provides reference for subsequent optimization and manufacture work.