蜂窝材料率相关本构模型及其在月球探测器中的应用研究

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (7) : 114-119.

论文

蜂窝材料率相关本构模型及其在月球探测器中的应用研究

胡建国1，马大为1，乐贵高1，赵婕2

作者信息 +

A Rate-dependent Constitutive Model for Honeycomb and its Application in the Lunar Lander

HU Jian-guo1, MA Da-wei1, LE Gui-gao1, ZHAO Jie2

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摘要

蜂窝材料是探测器缓冲装置中使用最多的缓冲介质之一，研究其力学特性对探测器缓冲器及上升器月面起飞稳定性设计具有重要意义。首先分析了蜂窝材料面内面外等效力学特性，在考虑蜂窝结构率相关特性的基础上，建立了蜂窝结构横观各向同性率相关本构模型；其次，基于有限元法编写了横观各向同性率相关本构模型用户子程序，并验证了其可靠性；最后，以四腿悬架式探测器为研究对象，研究了不同率敏感系数对探测器着陆过程的影响。结果表明：随着率相关系数的增加，缓冲器吸收的能量先增大再减小，当率相关系数为0.6时最大；探测器的最大冲击加速度一直增大，且当率相关系数较大时，最大冲击加速度增长速度较率相关系数较小时要大。

Abstract

Honeycomb is one of the most used buffer medium in buffer device of lunar lander, studying on the mechanical properties has an important significance to buffer device and ascender's stable take-off. Firstly, analysis the in-plane and out-of-plane equivalent mechanical properties of honeycomb, and the rate-dependent transverse isotropic constitutive model is built considering the rate-dependent features of honeycomb structure. Secondly, the user subroutine of rate-dependent transverse isotropic constitutive model is written based on FEM, and the reliability is verified. Finally, taking the four legs hanging rack lander as the research object, the influence of rate-dependent coefficients on landing impact performance is studied. The results show that with the increase of rate-dependent coefficient, the energy absorption of buffer device increases first and then decrease, and reach the maximum when the coefficient is 0.6; the biggest impact acceleration of lunar lander increase, and when the rate-dependent coefficient is large, the growth rate of the biggest impact acceleration is bigger than that when the rate-dependent coefficient is small.

导出引用

胡建国;马大为;乐贵高;赵婕. 蜂窝材料率相关本构模型及其在月球探测器中的应用研究[J]. 振动与冲击, 2014, 33(7): 114-119

HU Jian-guo;MA Da-wei;LE Gui-gao;ZHAO Jie. A Rate-dependent Constitutive Model for Honeycomb and its Application in the Lunar Lander[J]. Journal of Vibration and Shock, 2014, 33(7): 114-119