基于ANSYS的ITER杜瓦上环体的静力学分析

外真空杜瓦是国际热核聚变实验反应堆ITER(International Thermonuclear ExperimentaReactor)上的重要装置,是ITER托卡马克的最外侧部件,主要功能是提供真空环境,避免过多的热载荷传递到磁体系统和冷屏等结构;为了在氦气泄露,以及等离子体破裂等极端情况下保证主机的安全,外真空杜瓦必须具有足够的强度。ITER杜瓦上环体是杜瓦的重要组成部分,属于薄壁圆筒结构,由18部分组成(各部分焊接连接),取其1/9体模型和1/18壳模型分别运用大型有限元分析软件ANSYS,对其不同载荷状况进行了数值计算,分析结果表明,应力集中在矩形孔、轴向筋板和加强圈处,能够满足上环体强度要求,分析结果为其结构设计与优化提供了理论依据。

Static analysis of upper cylinder of ITER cryostat based on ANSYS

Cryostat is an important equipment of International Thermonuclear Experimental Reactor(ITER).It is the outer parts of ITER Tokamak,which function is to provide a vacuum environment and prevent excessive thermal load from transferring to magnetic assembly and thermal shield.In order to make sure the safety of host under the extreme case when helium leaks & plasma bursts,the cryostat must be enough in strength.The upper cylinder of ITER cryostat is the main part of cryostat,which is a thin walled cylinder in structure,and is made of 18 parts(every part is joint by welded),in which 1/9 body model and 1/18 shell model are taken respectively as an example to execute the FEA by applying software ANSYS,and numerical computation is made for different loading conditions.The result shows that the stress concentration areas is located on the rectangle hole,axial rib plate and stiffening ring,which can meet the required strength for the upper cylinder.This analysis result provides a theoretical basis for the structure design and optimization of cryostat.