星型拉胀蜂窝材料在压剪复合加载下的力学特性研究

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Abstract Auxetic honeycomb materials are widely used in various protective structures due to their good mechanical properties and stable energy absorption properties. In this paper, the finite element technology is used to establish the numerical model of the star auxetic honeycomb material, and the verification experiment is carried out based on the additive manufacturing technology and the universal testing machine. Furthermore, the simulation investigation of star-shaped auxetic honeycomb material under different compression-shear composite loading angles and speeds was carried out, and the yield surface of star-shaped auxetic honeycomb material was established. The results show that the star-shaped auxetic honeycomb material undergoes overall deformation under low-speed composite loading relying on the rotation of the cells, and produces oblique deformation belt crushing. More fully, the material deformation mode changes from overall deformation to local deformation, forming stress waves. The initial yield stress of the material was fitted by the ellipse equation, and the yield surface of the star-shaped auxetic honeycomb material was established. With the increase of the speed, the initial yield surface of the material showed obvious strengthening. The total energy absorption in the tangential and tangential directions showed a decreasing and increasing trend, respectively, and the tangential energy absorption characteristics were more sensitive to the change of the angle than the normal direction.

Key words： auxetic material star honeycomb complex loading yield surface energy absorption

Received: 20 July 2022 Published: 15 July 2023

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	Articles by authors
	LUO Geng1
	2
	MO Duanyu1
	LIU Junzhe1
	CHAI Chengpeng1
	CHEN Yisong1

Cite this article:

LUO Geng1,2,MO Duanyu1, et al. Mechanical properties of star-shaped auxetic honeycomb material under compression-shear composite loading[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(13): 183-192.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I13/183

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