【摘要】 储能飞轮提高储能密度的关键是提高飞轮转子的线速度 ,为了充分利用端盖材料高强度铝合金的性能 ,强度设计中引入弹塑性设计思想 ,建立了具有几何非线性的有限元弹塑性计算模型 ,提出分段线性化模拟材料非线性的算法。进行了端盖受轴向压力的力学实验 ,和计算结果作了比较。端盖的整体变形和弹塑性计算结果相当符合 ,端盖的破坏载荷大大超过弹性计算的结果。结果表明应用弹塑性计算进行端盖的强度设计是可行的 ,可以明显提高端盖的破坏极限 ,为飞轮端盖的强度设计和结构优化提供了重要方法更多还原

【Abstract】 The key in raising the energy density of energy storage flywheel is to increase the linear velocity of the rotor. To make better use of the limited loading ability of aluminum alloy material, the idea of elasto plasticity limit design is applied. This paper builds up a geometry nonlinear elasto plasticity FEA model and uses piecewise linear function to approximate the nonlinear material property. An experiment of static pressed damage under complex stress condition of flywheel aluminum alloy cover was designed to verify the above idea. The experiment result was compared with the finite element calculation, it shows that the deforming accords with the elasto plasticity computation, and the damage load is highly above the elastic estimate. This experiment result shows that nonlinear calculating would highly increase the design damage limit, and it also affirms the feasibility of the elasto plasticity computation and analysis in aluminum alloy material. It was very useful for stress optimal design of energy storage flywheel in the future.更多还原