目的 针对航空弹药长期贮存中湿气渗透、盐雾腐蚀与温度交变的多因素耦合侵蚀问题,以密封弹衣材料-结构一体化设计方案为背景与设计输入,重点建立密封界面的建模、仿真与参数优化方法。方法 提出“功能梯度材料-多层复合结构”方案,外层CNT改性抗静电TPU;中间层PA-EVOH-PE共挤高阻隔薄膜;内层EPDM双唇弹性密封结构。基于超弹性本构模型（C10=0.48 MPa,C01=0.12 MPa,R2=0.985）,用有限元法仿真压缩率（10%~40%）、温度（-40~+70 ℃）与硬度（邵尔A50~70）对密封界面接触压力的影响。结果 在-40~+70 ℃全温域内,压缩率保持22%~28%时接触压力稳定高于0.50 MPa阈值。25%压缩率、23 ℃时峰值接触压力0.85 MPa,密封均匀度η=0.81。结论 三层复合结构在宽温域下密封可靠,Mooney-Rivlin模型可有效预测EPDM非线性力学响应,所得参数-性能映射可为批量生产提供设计依据。
Abstract
Addressing the coupled erosion of moisture penetration, salt spray corrosion and alternating temperature during long-term storage of aerial ammunition, the work aims to take the integrated material-structure design scheme of the sealing cover as the background and design input to establish a method for the modelling, simulation and parameter optimization of the sealing interface. A scheme of "functionally graded material-multilayer composite structure" was proposed, with the CNT-modified antistatic TPU as the outer layer, a PA-EVOH-PE co-extruded high-barrier film as the middle layer, and an EPDM double-lip elastic sealing structure as the inner layer. Based on the hyperelastic constitutive model (C10=0.48 MPa, C01=0.12 MPa, R2=0.985), the effects of compression ratio (10%-40%), ambient temperature (-40 to +70 ℃) and hardness (Shore A 50-70) on the sealing interface contact pressure were simulated by the finite element method. Within -40 to +70 ℃, the contact pressure steadily exceeded the sealing reliability threshold of 0.50 MPa when the compression ratio was kept at 22%-28%. At 25% compression ratio and 23 ℃, the peak contact pressure reached 0.85 MPa with a sealing uniformity η=0.81. The three-layer composite structure provides stable sealing reliability over a wide temperature range. The established Mooney-Rivlin model can effectively predict the nonlinear mechanical response of the EPDM sealing layer, and the obtained parameter-performance mapping provides design references for mass production.
关键词
航空弹药 /
密封弹衣 /
三元乙丙橡胶（EPDM） /
有限元分析 /
密封可靠性
Key words
aerial ammunition /
ammunition sealing cover /
ethylene propylene diene monomer (EPDM) /
finite element analysis /
sealing reliability
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基金
空军勤务学院青年基金项目（26KQQ-19）
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