腿式着陆器缓冲材料缓冲特性及其表征方法研究

Study on Cushion Properties and Its Characterization Methods of Legged Lander's Cushion Materials

为了研究适合腿式着陆器用缓冲器的缓冲材料,对8种不同规格的薄壁铝管,3种不同规格的铝蜂窝及4种不同规格的泡沫铝在准静态及冲击载荷作用下的压缩特性进行了试验研究,并得出了其相应的应力/能量-应变曲线图。通过对缓冲材料的应力-应变曲线图及压缩特性进行系统的研究分析,得到了5类缓冲材料缓冲特性的表征方法,这些表征方法可以全面地对不同缓冲材料的缓冲特性进行评价,以便指导腿式着陆器用缓冲器的设计。最后结合所提出的缓冲材料缓冲特性的表征方法,对所试验的薄壁铝管、铝蜂窝及泡沫铝这3类不同的缓冲材料的缓冲特性进行了总结,并得到了粗孔的名义压缩强度为0.14～0.15MPa的泡沫铝为在所试验的缓冲材料中,是最理想的腿式着陆器用缓冲材料。

In order to investigate the cushion materials suitable for shock absorber of legged Lander, experimental investigations were carried out to study quasi-static and dynamics compressive behavior of eight different specification thin- walled aluminum tubes, three different specification aluminum honeycombs and four different specification aluminum foams, whose stress/energy-strain curves were also given. Five kinds of characterization methods of cushion properties on cushion materials obtained through systematical analysis of the stress-strain curves and compressive behavior of the cushion materials. These methods can be used to evaluate the cushion properties comprehensively, and guide design legged Lander＇s shock absorber. At last, based upon the characterization methods of cushion properties on cushion materials, the cushion properties of thin-walled aluminum tube, aluminum honeycomb and aluminum foam were summarized, the coarse-hole aluminum foam with nominal stress strength 0.14 -0.15MPa is the best selection for legged Lander＇s cushion material of these samples.