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为提高储能飞轮可靠性,并延长寿命,研究了储能飞轮铝合金轮毂的蠕变温度特性。采用宏观唯像分析方法,通过轮毂在不同温度、不同转速下的蠕变实验,拟合了包含应力、时间、温度等变量在内的完整的反映飞轮轮毂在低温条件下(75℃以下)蠕变规律的蠕变方程。并用有限元分析的方法对飞轮轮毂在工作条件下的蠕变过程进行了模拟。分析结果表明,在40℃的高真空环境下以转速5×104r/m in运行的储能飞轮,在20 a的寿命期内可以忽略铝合金材料蠕变因素对其强度和寿命的影响。
In order to improve the reliability of energy storage flywheel and prolong its life, the creep temperature characteristics of energy storage flywheel aluminum alloy hub were studied. Using macroscopic portrait analysis method, through the creep experiments of wheel hub at different temperatures and different speeds, a complete set of parameters including stress, time, temperature and other variables were fitted to reflect the freewheeling hub under low temperature (below 75 ℃) Variable law of creep equation. The finite element method is used to simulate the creep of flywheel hub under working conditions. The analysis results show that the energy storage flywheel operating at a speed of 5 × 104r / min in a high vacuum environment at 40 ℃ can ignore the effect of creep factors on the strength and life of aluminum alloy materials over the life of 20 years.