金属气囊膨胀性能影响因素研究

Factors Affecting Swelling Performance of Metal Airbags

金属气囊具有较强的承压能力和良好的气密性、形状稳定性及环境适应性,在各类航天器做动变形及减振抗冲击结构设计中成为行业研究热点。主要研究了气囊膨胀过程中导致断裂或褶皱失稳等现象的关键参数,同时分析了进气口位置和气囊边缘厚度对膨胀效果的影响。采用有限元方法,选用5组常用金属材料参数为基础数据,对材料的密度、弹性模量、泊松比和屈服极限进行正交试验。仿真结果表明,金属气囊最大膨胀高度受材料密度影响最大,极差为8.26 mm;最大褶皱深度受屈服极限影响最大,极差为5.48 mm;褶皱数受屈服极限影响最小,极差仅为0.8个;虽然进气口位置将影响气囊膨胀的均匀性,但会在特定区域达到更大的膨胀高度;虽然提高边缘厚度会增加气囊的强度,但会降低气囊最大膨胀高度。结果可为金属气囊的工程设计提供理论参考。

The metal airbag has become a research hot issue in the design of dynamic deformation and shock reduction structures of various spacecraft because of its high strength,good air tightness and environmental adaptability,as well as better shape stability,This paper mainly studies the key parameters that lead to fracture or fold instability during the inflation process of airbags,and also analyzes the influences of the location of the air inlet and the thickness of the balloon edge on the swelling effect.With the finite element simulation method,the five groups of commonly used metal material parameters are selected as the basic data to carry out the orthogonal experiments on material density,Young's modulus,Poisson's ratio and yield limit.The simulation results show that the maximum expansion height of the metal airbag is most affected by the material density,and the range is 8.26 mm.The maximum fold depth is most affected by the yield limit,with a range of 5.48 mm.The number of folds is least affected by the yield limit,and the range is only 0.8.The location of the air inlet will affect the uniformity of the balloon expansion,but will provide a larger expansion height in a specific area.Increasing the edge thickness will enhance the strength of the airbag,but reduce the maximum expansion height of the airbag.This conclusion can provide theoretical reference for engineering design of metal airbag.