摘要
A theoretical model is proposed to calculate the internal contact distributions and contact forces of a 3×4×4×4 twisted NbSn cable under applied axial strain.The critical current density reduction of the whole cable can be calculated.The thin rod theory is employed to analyze the mechanical behavior of each strand.According to the regular helical structure,the contact distribution of each strand is obtained,and the contact force in the cable is analyzed.At last,a prediction about the critical current density of the twisted cable is made.The results show that decreasing the pitch length can reduce the contact forces between strands.
A theoretical model is proposed to calculate the internal contact distributions and contact forces of a 3×4×4×4 twisted Nb_3Sn cable under applied axial strain.The critical current density reduction of the whole cable can be calculated.The thin rod theory is employed to analyze the mechanical behavior of each strand.According to the regular helical structure,the contact distribution of each strand is obtained,and the contact force in the cable is analyzed.At last,a prediction about the critical current density of the twisted cable is made.The results show that decreasing the pitch length can reduce the contact forces between strands.
基金
Project supported by the National Natural Science Foundation of China(Nos.11202087,11472120 and 11421062)
the National Key Project of Magneto-Constrained Fusion Energy Development Program(No.2013GB110002)
the National Key Project of Scientific Instrument and Equipment Development(No.11327802)
New Century Excellent Talents in University of Ministry of Education of China(NCET-13-0266)
