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Research Papers

Strain Rate Effect on Mechanical Behavior of Metallic Honeycombs Under Out-of-Plane Dynamic Compression

[+] Author and Article Information
Yong Tao, Yongmao Pei, Daining Fang

LTCS,
College of Engineering,
Peking University,
Beijing 100871, China

Mingji Chen

National Center for Nanoscience and Technology,
Beijing 100190, China
e-mail: mjchen81@gmail.com

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received November 27, 2014; final manuscript received December 15, 2014; accepted manuscript posted December 31, 2014; published online January 8, 2015. Editor: Yonggang Huang.

J. Appl. Mech 82(2), 021007 (Feb 01, 2015) (6 pages) Paper No: JAM-14-1543; doi: 10.1115/1.4029471 History: Received November 27, 2014; Revised December 15, 2014; Accepted December 31, 2014; Online January 08, 2015

Although many researches on the dynamic behavior of honeycombs have been reported, the strain rate effect of parent materials was frequently neglected, giving rise to the underestimated plateau stress and energy absorption (EA). In this paper, the strain rate effect of parent materials on the out-of-plane dynamic compression and EA of metallic honeycombs is evaluated by both numerical simulation and theoretical analysis. The numerical results show that the plateau stress and the EA increase significantly if the strain rate effect is considered. To account for the strain rate effect, a new theoretical model to evaluate the dynamic compressive plateau stress of metallic honeycombs is proposed by introducing the Cowper–Symonds relation into the shock theory. Predictions of the present model agree fairly well with the numerical results and existing experimental data. Based on the present model, the plateau stress is divided into three terms, namely static term, strain rate term, and inertia term, and thus the influences of each term can be analyzed quantitatively. According to the analysis, strain rate effect is much more important than inertia effect over a very wide range of impact velocity.

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References

Figures

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Fig. 1

FE model of a hexagonal honeycomb

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Fig. 2

Comparison between experimental [38] and numerical results

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Fig. 3

Comparison of (a) compressive stress and (b) EA of honeycombs when different strain rate dependent parameters are adopted (impact velocity v=20 m/s)

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Fig. 4

Curves of (a) plateau stress and (b) EA versus impact velocities when different strain rate parameters are adopted for parent material

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Fig. 5

Comparison between theoretical predictions and numerical results

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Fig. 6

Comparison between theoretical predictions and experimental results [9]

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Fig. 7

Comparison of the (a) stress and (b) proportion of every term under different impact velocities

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