| Autor: |
Jiang, Lang, Zhang, Xingyi, Zhou, You-He |
| Zdroj: |
Acta Mechanica Sinica; Mar2023, Vol. 39 Issue 3, p1-14, 14p |
| Abstrakt: |
In this paper, the nonlinear mechanical behaviors of Nb3Sn superconducting composite wires have been investigated by the quasi-static loading-unloading tensile and fatigue tests at the temperature of 77 and 300 K, respectively, which indicates that the quasi-static stress-strain curves and energy dissipations exhibit strong nonlinearity. Meanwhile, the nonlinear and linear unloading modulus are derived by considering the damage degradation, and the elastic-plastic constitutive is proposed to predict the quasi-static loading-unloading stress-strain responses and energy dissipation. Moreover, the damage evolution model has been conducted to elucidate the energy dissipation of fatigue tests for the Nb3Sn composite wire at the temperature of 77 and 300 K. The combination of experimental and theoretical results indicates that the nonlinearity of energy dissipation is caused by damage degradation during quasi-static loading and unloading tensile tests. Furthermore, the fatigue fracture modes of Nb3Sn composite wires also have been analyzed, which indicated that the Nb3Sn sub-elements show brittle fracture at the temperature of 77 K while ductile fracture at the temperature of 300 K. These findings provide novel insights into the nonlinear mechanical behaviors of Nb3Sn superconducting composite wires. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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