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| Sensitivity Analysis of Out-of-plane Pre-compressed Aluminum Honeycomb to Drop First Peak Force |
| WANG Zhong-gang1,2, LU Zhai-jun1,2, XIA Xi1,2 |
1. Key Laboratory of Traffic Safety on Track(Ministry of Education), Changsha 410075, China;
2. School of Traffic & Transportation Engineering, Central South University, Changsha 410075, China |
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Abstract Numerical simulations of the pre-compressed aluminum honeycomb on sensitivity in dropping the first peak force were presented by resetting boundary conditions after refreshing the dynamic geometry and cell element information. The mechanical behavior of the aluminum honeycomb was observed before and after pre-compression compared with the quasi-static experiment, and necessarily the sensitivity of the first peak force on impact velocity and pre-compressed depth was analyzed. The results show that the honeycomb enters directly into the plateau stage without the first peak force under quasi-static loads; while impacting at a low velocity, there is a critical pre-compressed depth, and less than which a second peak force appears after some of stable compression, but when equal or larger than the critical depth, it appears at the initial time, thus, it is not tenable that the ideal periodic fold corresponding with the periodic peak force; to the pre-compressed honeycomb which has a second peak, the growing of the second peak is unobvious with the increasing of the impact velocity, on the contrary, a new initial peak force appears, which is even higher than the second one when the impact velocity higher than 20m/s; in general, both of the second peak force and the initial one are far smaller than the first peak force of the general honeycomb, and the property of the peak force is improved significantly after pre-compression. Series conclusions provide significant references for choosing and designing of cellular energy-absorbing materials.
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Received: 27 April 2012
Published: 20 May 2013
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2013, Vol. 0 
