双S弯结构, 能量原理, 数值模拟, 应变

The double-S curved structure is a critical part in the ITER(international thermal-nuclear experimental reactor) feeder system, which will be responsible for absorbing the displacement deformation

from the busbar caused by the thermal contract during the cooling process.The distribution of axial force, bending moment and strain along axial direction in this structure were calculated using an unit force method which was based on the energy principle. This could help to study the deformation of a double-S curved structure under certain displacement loading. The simulation and experiment were carried out. The calculated strains is very close to the simulated values or the experimental ones. It is shown that this method used to calculate the distribution of axial force, bending moment and strain in similar structure is feasible, and the calculated results are highly accurate.