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模拟了燃料包壳用Zr-Nb合金管材在RIA事故工况下的失效行为,研究了温度和升压速率对管材爆破性能的影响。不同温度下快速爆破时的升压速率分别为293 K时0.97 GPa/s,473 K时0.62 GPa/s,623 K时0.49 GPa/s;参考ASTM标准实施的爆破试验在各温度下的升压速率均为0.23 MPa/s。结果表明,爆破温度升高,管材爆破强度降低,破口的环向延伸率升高,管材的均匀延伸率受温度影响不明显。所有测试条件下管材均呈鼓包失效,破口沿轴向延伸,升压速率高,破口更宽。温度越高,管材塑性增加,破口长度减小。
The failure behaviors of Zr-Nb alloy tubes for fuel cladding under RIA accident conditions were simulated. The effects of temperature and pressure rise rate on the tube burst properties were investigated. The rate of pressure rise at rapid blasting at different temperatures was 0.97 GPa / s at 293 K, 0.62 GPa / s at 473 K and 0.49 GPa / s at 623 K. Reference to the burst test conducted by the ASTM standards Boost at each temperature The rates are 0.23 MPa / s. The results show that the blasting temperature increases, the burst strength of the pipe decreases, and the hoop elongation increases. The uniform elongation of the pipe is not affected by the temperature. Under all testing conditions, the tubing showed failure of bulging bulge, and the bulge extended along the axial direction, with a high pressurization rate and a wider opening. The higher the temperature, plastic pipe increases, breaking the length decreases.