Integrated Design and Sealing Simulation of Aerial Ammunition Sealing Covers

JIANG Lin; MA Chao; WANG Changlong; GENG Lin; GE Hongtao; LI Jing; XIE Yongqing

doi:10.19554/j.cnki.1001-3563.2026.19.028

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (19) : 276-286. DOI: 10.19554/j.cnki.1001-3563.2026.19.028

Equipment Protection

Integrated Design and Sealing Simulation of Aerial Ammunition Sealing Covers

JIANG Lin¹, MA Chao¹, WANG Changlong^1,*, GENG Lin¹, GE Hongtao², LI Jing³, XIE Yongqing⁴

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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.

Key words

aerial ammunition / ammunition sealing cover / ethylene propylene diene monomer (EPDM) / finite element analysis / sealing reliability

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JIANG Lin, MA Chao, WANG Changlong, GENG Lin, GE Hongtao, LI Jing, XIE Yongqing. Integrated Design and Sealing Simulation of Aerial Ammunition Sealing Covers[J]. Packaging Engineering. 2026, 47(19): 276-286 https://doi.org/10.19554/j.cnki.1001-3563.2026.19.028

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