不完整因子条件下内凹六边形微结构面内动态性能研究

doi:10.19562/j.chinasae.qcgc.2021.06.017

Abstract

Abstract:

In order to better clarify the effect of incomplete factors on dynamic performances of cellular material， a re?entrant hexagonal cellular structure with negative Poisson’s ratio is taken as research object. A joint simulation analysis approach with the adoption of Hyperworks and Ls?dyna software is employed to analyze the effect of incomplete factors and impact velocities on its in?plane dynamic performances with the lack of cell wall， and the corresponding deformation modes， stress?strain curves， platform stress curves and energy absorption curves are acquired. The results show that at the same impact velocity， with the increase of incomplete factors， the stable and orderly deformation mode tends to be disordered， and the platform stress and energy absorption capacity will decrease simultaneously. Under low velocity impact， the influence of incomplete factor on its dynamic performances is small， while under high velocity impact， the influence of incomplete factors on its dynamic performances is large， so the existence of incomplete factors should be avoided. The research results in this paper provide data support for the application of cellular structure material in vehicle energy absorbers.

Key words: re?entrant hexagonal cellular structure, negative Poisson's ratio, incomplete factor, finite element simulation, in?plane dynamic performances

Ying Zhao,Jie Ma,Ye Sang,Kaifeng Wang,Fangwu Ma. Study on In⁃plane Dynamic Performances of Re⁃entrant Hexagonal Cellular Structure with Incomplete Factors[J].Automotive Engineering, 2021, 43(6): 924-933.

Figures/Tables 12

冲击速度/（ $m ? s - 1$ ）	IF值/%	$σ P / M P a$
8	0	0.250
	1	0.234
	2	0.240
	3	0.242
	4	0.204
	5	0.196
20	0	0.258
	1	0.297
	2	0.245
	3	0.260
	4	0.257
	5	0.224
50	0	0.326
	1	0.318
	2	0.293
	3	0.278
	4	0.253
	5	0.250
90	0	0.368
	1	0.372
	2	0.337
	3	0.309
	4	0.306
	5	0.300

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Study on In⁃plane Dynamic Performances of Re⁃entrant Hexagonal Cellular Structure with Incomplete Factors

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