Dynamic crushing of the circular-celled honeycombs under out-of-plane impact

Published on Jan 1, 2015in International Journal of Impact Engineering4.208
· DOI :10.1016/J.IJIMPENG.2014.08.008
Lingling Hu18
Estimated H-index: 18
(SYSU: Sun Yat-sen University),
X.L. He2
Estimated H-index: 2
(SYSU: Sun Yat-sen University)
+ 1 AuthorsTongxi Yu54
Estimated H-index: 54
(HKUST: Hong Kong University of Science and Technology)
Sources
Abstract
The dynamic crushing of circular-celled honeycombs under out-of-plane impact is studied within a wide range of impact velocity by using both theoretical and numerical methods, and verified by the experiments. Two kinds of honeycombs with different cell package, i.e., the SP and HP honeycombs, are considered. The results of the honeycombs are discussed and compared with those of the cylindrical tubes under axial compression. An analytical expression is deduced to predict the honeycombs' crushing stress, showing good agreements with the numerical results. It is shown that the energy absorption per unit mass of the HP honeycomb and the SP honeycomb is at least 13.3% and 6.4%, respectively, greater than that of the cylindrical tubes. And the HP honeycomb can absorb at least more 23% energy per unit volume than the SP ones mainly due to the denser package mode of the cells. The different energy absorption ability among the two kinds of honeycombs and the cylindrical tubes can be attributed to the different constraints around the cylindrical cells and tubes, which is verified by the experiments. A non-dimensional “dynamic sensitivity index” is used to quantitatively evaluate the sensitivity of the structure's load capacity to the impact velocity, showing the most sensitivity of the tube and the least sensitivity of the HP honeycomb, which are confirmed by the numerical results.
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References27
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#1L.L. Hu (SYSU: Sun Yat-sen University)H-Index: 1
#2Li-Wen Hu (SYSU: Sun Yat-sen University)H-Index: 23
Last. D.Y. Cai (SYSU: Sun Yat-sen University)H-Index: 1
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Abstract The analytical expression of the detailed undulation of the plateau stress of the hexagonal honeycombs under the low-velocity and the middle-velocity crushing is deduced, which consists of the static term and the dynamic term. It is shown that the level of the honeycomb׳s stress significantly decreases with the increase of the cell-wall angle under both the low-velocity and the middle-velocity impacts, which is mainly attributed by the static term in the expression of the honeycomb׳s st...
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#2Fanfan You (SYSU: Sun Yat-sen University)H-Index: 2
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Abstract Based on the cells’ collapse mechanisms revealed from the numerical simulations, analytical models are established to deduce the crushing strength of the honeycombs along the y -direction with wide range of impact velocity, which express crushing strength as a function of the impact velocity, the cell size, the cell-wall angle, and the mechanical properties of the base material. The analytical predictions are in good agreement with the numerical simulation results. The optimal cell-wall...
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Abstract Based on the cells’ collapse mechanisms of the hexagonal honeycombs revealed from the numerical simulations under the low-velocity impact, an analytical model is established to deduce the crushing strength of the honeycomb and the stress at the supporting end both as functions of impact velocity, cell size, cell-wall angle, and the mechanical properties of the base material. The results show that the honeycomb’s crushing strength increases with the impact velocity, while the supporting ...
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