针对减压阀圆平膜片的传统设计方法存在效率和精度较低等缺陷,使用ABAQUS建立了某型减压阀的圆平膜片及其附属结构的有限元模型,完整地模拟实际的装配与工作过程.展示该模型在不同工作参数作用下的应力分布和变形,对膜片在额定工况下的应力分布进行分析,并讨论气压载荷、位移栽荷以及附属结构的压紧力对膜片的应力分布和变形所造成的影响.结果显示膜片在底硬芯边缘附近和夹持环边缘附近会出现剧烈的应力变化,应力值超过了材料的屈服极限；在额定的工作参数下,膜片的应力分布主要受压强载荷的影响,而且附属结构的压紧对于降低膜片的应力值有非常大的作用.%To counter the defects that exist in the traditional design of circular flat diaphragm, such as low efficiency and low accuracy, ABAQUS is used to establish the finite element model for a circular flat diaphragm of a pressure-reducing valve and its accessory structures. The simulation includes both assembly and working process. This paper demonstrates the results of the model under different working parameters. The stress distribution of the diaphragm under rated conditions is analyzed and the influence of pressure load, displacement load and accessory structure pressing force are discussed. It is shown that the stress near the edge of bottom hard core and the edge of clip rings changes violently, where the stress magnitude exceeds the material yield limit; the stress distribution is mainly influenced by pressure load under rated conditions, and the accessory structure pressing force plays an important role in reducing the stress magnitude.
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