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Although there aren¡¯t too many innovations in the methodology, but it¡¯s still a very interesting topic. The paper is written in a good English, except for some minor mistakes. However, there are still some works, which are worth being discussed. Such as:
1. Shujuan Hou, Qing Li, Shuyao Long. Design Optimization of Regular Hexagonal thin-walled Columns with crashworthiness criterion. Finite Elements in Analysis and Design, 2007, 43(6-7): 555-565.
2. Shujuan Hou, Shuyun Zhao, Lili Ren, Xu Han, Qing Li. Crashworthiness optimization of corrugated sandwich panels. Materials & Design, 2013, 51: 1071-1084.
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The validity of analytical model to experimental result(actual phenomena) was not confirmed through the manuscript. Please explain that the analytical model is not mere numerical play but the representation of actual phenomenon by a certain results is advisable. Especially, for separation points, what is the mechanism of the separation between stable and unstable and what they express in experimental result(actual phenomena)
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