Speaker
Description
The ITER Cryostat—the largest stainless steel vacuum pressure chamber ever built which provides the vacuum environment for components operating in the range from 4.5k to 80k like ITER vacuum vessel and the superconducting magnets. The Cryostat being a Safety Important Class component, Design validation at each stage is necessary if there is any deviation. The Cryostat is currently at manufacturing stage, frequent changes major/minor are coming during manufacturing process, some of which being judgmental needs fine assessment. Assessing the effect of these changes using the conventional FE method needs significant time and effort. Also the need of iteration for every change further increases the time and effort by manifold in just making FE model. This paper will present a unique method to develop FE model of complex systems like Cryostat and enables to validate the structural strength of the system during any load or load combinations. One can incorporate frequent changes quickly and assess with ease. This paper mainly focuses on the details of the different approach in development of FE model of Cryostat from current manufacturing Model of Cryostat. In this method the context and complexities identified and component wise thirty FE models of Cryostat are generated. Then these FE models are integrated into a full Cryostat (assembly) FE model using suitable contact definitions. This approach facilitates to incorporate component level changes without affecting the whole Cryostat FE model, thus saving in time and efforts of re-creating the meshed model. Secondly it demonstrates simplification in Cryostat Bearing model [3,4]. Lastly validation of the analysis result of this FE model with ASME Section VIII Div 2 and with previous Cryostat assessment [1,2]. This approach once developed, reduce time and effort drastically which makes iterations easier and hence enables quick decision making for the Design Responsible authority.
References
[1] B. Doshi, C. Zhou, K. Ioki, H. Xie, et al., ITER cryostat—an overview and design progress, Fusion Engineering and Design 86 (2011) 1924–1927.
[2] Liang Chaoa,b,∗, M.Y. Yec, D.M. Yaoa, Cao Lei a, Z.B. Zhoua, Xu Teijuna, Wang Jianc ., The structure analysis of ITER cryostat based on the finite element method , Fusion Engineering and Design 88 (2013) 42–45
[3] Instructional Material Complementing FEMA 451, Design Example, S I- 15-7-53
[4] ANSYS code help.
| Eligible for student paper award? | No |
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