Limit analysis of W7-X critical magnet system components with consideration of material serration effect

作者：Ciupinski Lukasz^*; Krzesinski Grzegorz; Marek Piotr; Zagrajek Tomasz; Fellinger Joris; Bykov Victor; Dudek Andrzej; Schauer Felix; Panin Anatoli

来源：Fusion Engineering and Design, 2011, 86(6-8): 1501-1505.

DOI：10.1016/j.fusengdes.2011.03.008

• Cryogenic magnet system
• Finite element models
• Limit analysis
• Serration effect

The paper reports on finite element (FE) method analyses aiming at the determination of the static load bearing capacity of critical components in the support structure of superconducting coils of Wendelstein 7-X (W7-X). These components are made of austenitic stainless steel that at 4K is known to exhibit instable plastic flow - the so-called serration effect, i.e. a scattering of the stress under increasing strain. This material behavior may significantly reduce the load bearing capacity of the components. The developed modeling approach uses a special procedure to simulate the serration effect in a conservative way. The expected reduction of the material properties due to the welding process is also taken into account. It is demonstrated that the models are capable to determine the limit loads for the critical components in a flexible and efficient way.

• 出版日期2011-10