冲击载荷下多胞元薄壁结构的动态压溃行为研究

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摘要为了提高薄壁结构的动态承载能力和能量吸收特性，基于弯曲主导型和拉伸主导型两类能量吸收结构的优点，本文构建了多胞元薄壁结构模型。利用显式动力有限元方法，研究了不同冲击载荷下多胞元薄壁结构的动态压溃响应和比能量吸收能力。研究结果表明，除了冲击速度，多胞元薄壁结构的动态压溃行为还受到肋板间夹角和冲击角度的影响。在相同相对密度和冲击速度下，多胞元薄壁结构的动态承载能力明显高于空心薄壁圆管。随着肋板间夹角的增大，多胞元薄壁结构的动态承载特性和比能量吸收能力明显提高，冲击载荷效率也相应增加。需要指出的是，当肋板间夹角增大到45º时，比吸能变化不再明显，试件具有较好的冲击载荷一致性。

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	白江畔1
	张新春1
	沈振峰1
	吴鹤翔2

关键词 ：冲击动力学, 多胞元圆管, 肋板夹角, 能量吸收, 冲击载荷一致性

Abstract： In order to improve the dynamic bearing capacity and energy absorption characteristics of thin-walled structures, combined with the advantages of bending-dominant and tension-dominant structures, a kind of multi-cell thin-walled structure model was established in this paper. The dynamic collapse responses and specific energy absorption abilities of these multi-cell thin-wall structures were numerically investigated under different impact velocities by means of the explicit dynamic finite element analysis (EDFEA). The results showed that except for the impact velocity, the dynamic collapse behaviors of the multi-cell thin-wall tubes were also affected by the ribbed angle and the impacting angle. Under the conditions that the relative density and impact velocity were all the same, the dynamic bearing capacity of the multi-cell thin-wall tube was obviously higher than that of the empty tube. With the increase of the ribbed angles, the dynamic bearing characteristics and specific energy absorption abilities of the multi-cell tubes were improved obviously, and the impacting efficiency was also increased correspondingly. It should be noted that when the ribbed angle was greater than or equal to 45º, the variation of the specific energy absorption was no longer distinct. Moreover, the multi-cell circular tubes have the better crushing load uniformity.

Key words： impact dynamics multi-cell circular tube ribbed angle energy absorption crushing load uniformity

收稿日期: 2019-04-11 出版日期: 2020-09-15

引用本文:

白江畔1，张新春1，沈振峰1，吴鹤翔2. 冲击载荷下多胞元薄壁结构的动态压溃行为研究[J]. 振动与冲击, 2020, 39(18): 145-152.
BAI Jiangpan1，ZHANG Xinchun1，SHEN Zhenfeng1，WU Hexiang2. Dynamic crushing behaviors of multi-cell thin-walled structures under out-of-plane impact. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(18): 145-152.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2020/V39/I18/145

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