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

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (7) : 114-119.

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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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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.

Key words

honeycomb / rate-dependent / transversely isotropic / constitutive model / subroutine / lunar lander

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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