期刊
COMPOSITE STRUCTURES
卷 96, 期 -, 页码 726-735出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2012.10.008
关键词
Multi-layer regularly arranged circular honeycombs; Deformation mode; Dynamic plateau stress; Energy absorption model; Densification strain
资金
- National Natural Science Foundation of China [10925212, 90916027]
- 973 Program [2011CB610304]
- 111 Project [B07050]
- Natural Science Foundation of Shaanxi Province [2010JQ1011]
- Natural Foundation of Education Department of Shaanxi [11JK0534]
- Initial Research Foundation of Shaanxi University of Science and Technology for Ph.D. [BJ12-15]
The dynamic deformation modes, plateau stresses and energy absorption performance of multi-layer regularly arranged circular honeycombs are investigated numerically under the in-plane crushing loadings at the impact velocities 3-250 m/s, with aim to disclose the influences of configuration parameters and impact velocity on them. The numerical results are presented in the forms of diagrams, curves and tables. With increasing impact velocities, the double V-shaped (quasi-static homogeneous mode), V-shaped (transition mode) and I-shaped (dynamic mode) collapse bands are observed in turn. A simplified energy absorption model is put forward and employed to describe the energy absorption performance. It is shown that the optimal energy absorption per unit volume is related to dynamic plateau stress and dynamic densification strain and that the optimal energy absorption efficiency is the reciprocal of dynamic densification strain. From physical analysis and discussion, the empirical formulas of critical velocity of mode transition, plateau stress and dynamic densification strain are given based on the numerical results. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
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