【作者】 王海宾；

【导师】 范锦彪；

【作者基本信息】 中北大学 ， 仪器科学与技术， 2024， 硕士

【摘要】 在高速侵彻过程中,弹体将承受巨大的冲击过载,因此位于弹体内部的电子学模块也将承受同样的环境。为了提高弹载电子学模块的存活性,本文针对高过载环境下泡沫铝对弹载电子学模块的保护进行了研究。通过理论分析、试验结合仿真的方法,研究了泡沫铝试件的力学性能,探讨了泡沫铝试件的参数对缓冲性能的影响,基于动静态试验数据拟合得到了泡沫铝的本构方程。研究内容主要包括:(1)分析了高过载环境下弹载电子学模块损坏的主要因素。将缓冲材料对弹载电子学模块的物理缓冲模型转化为基础激励力学模型,在此基础上推导了缓冲材料的动态应力-应变曲线的求解方法。泡沫铝具有高阻抗、高吸能等特点,所以选择其作为弹载电子学模块外部缓冲材料。(2)通过泡沫铝的准静态试验和泡沫铝对弹载电子学模块的缓冲试验,得到了泡沫铝准静态和动态应力-应变曲线,重点分析了泡沫铝密度、厚度以及及应变率的影响。(3)选择Sherwoord-Frost本构模型作为泡沫铝的本构方程框架,结合准静态和动态应力-应变曲线对本构方程进行了参数拟合,得到了包含密度和应变率的泡沫铝本构方程。(4)基于泡沫铝本构方程,结合仿真软件True-grid和Ls-Dyna,建立了泡沫铝对弹载电子学模块缓冲的有限元模型。针对约5万g的激励,分别进行了缓冲效果的仿真模拟和空气炮试验,仿真缓冲效率的误差约13.03%。更多还原

【Abstract】 During high-speed penetration,the projectile will withstand significant impact overload,so the electronic modules located inside the projectile will also withstand the same environment.In order to improve the survivability of missile borne electronics module,this paper studies the protection of missile borne electronics module by foam aluminum under high overload environment.Through theoretical analysis,experiment and simulation,the mechanical properties of foam aluminum specimens were studied,and the influence of foam aluminum specimen parameters on cushioning performance was discussed.Based on the dynamic and static test data,the constitutive equation of foam aluminum was obtained.The research content mainly includes:(1)Analyzed the main factors causing damage to missile borne electronic modules in high overload environments.The physical buffering model of the cushioning material on the electronic module of the missile was transformed into a basic excitation mechanics model,and based on this,a solution method for the dynamic stress-strain curve of the cushioning material was derived.Foam aluminum has the characteristics of high impedance and high energy absorption,so it is selected as the external buffer material of missile borne electronics module.(2)The quasi-static and dynamic stress-strain curves of foam aluminum were obtained through the quasi-static test of foam aluminum and the buffering test of foam aluminum on missile borne electronic modules.The effects of density,thickness and strain rate of foam aluminum were emphatically analyzed.(3)Sherwood Frost constitutive model was selected as the constitutive equation framework of foam aluminum,and the constitutive equation was fitted with parameters in combination with quasi-static and dynamic stress-strain curves,and the constitutive equation of foam aluminum including density and strain rate was obtained.(4)Based on the constitutive equation of foam aluminum,combined with the simulation software True grid and Ls Dyna,the finite element model of foam aluminum cushioning the missile borne electronics module was established.For an excitation of about 50000 g,simulation simulations and air gun tests were conducted on the buffering effect,and the simulated buffering efficiency error was about 13.03%.更多还原