In-plane dynamic mechanical properties of partially liquid filled multicell structure

ZHAO Zhujie; HOU Hailiang; LI Dian; WANG Ke; YAO Menglei

doi:10.11883/bzycj-2021-0173

Volume 42 Issue 3

Apr. 2022

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ZHAO Zhujie, HOU Hailiang, LI Dian, WANG Ke, YAO Menglei. In-plane dynamic mechanical properties of partially liquid filled multicell structure[J]. Explosion And Shock Waves, 2022, 42(3): 033103. doi: 10.11883/bzycj-2021-0173

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ZHAO Zhujie, HOU Hailiang, LI Dian, WANG Ke, YAO Menglei. In-plane dynamic mechanical properties of partially liquid filled multicell structure[J]. Explosion And Shock Waves, 2022, 42(3): 033103. doi: 10.11883/bzycj-2021-0173

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In-plane dynamic mechanical properties of partially liquid filled multicell structure

doi: 10.11883/bzycj-2021-0173

Department of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan 430033, Hubei, China

Received Date: 2021-05-07
Accepted Date: 2022-01-24
Rev Recd Date: 2021-07-01

Available Online: 2022-02-23

Publish Date: 2022-04-07

Abstract

Abstract

In order to investigate the impact protection performance of partially liquid filled multicell structure, the two-dimensional FEM numerical analysis of the impact dynamic characteristics of liquid filled inner concave cell structure, unfilled inner concave cell structure, partially liquid filled inner concave multicell structure and unfilled inner concave multicell structure was established by combining the drop hammer impact test of liquid filled and unfilled inner concave cell structure. The deformation/failure mode of partially liquid filled inner concave multicell structure was obtained, and the dynamic response characteristics and energy absorption characteristics of partially liquid filled inner concave multicell structures at different impact velocities were discussed by using the initial load weakening factor and the strain energy per unit volume, respectively. The results show that after the breakage of the liquid filled cell, the water medium will flow into the adjacent unfilled cell, developing a secondary bulging energy absorption effect, thus effectively increasing the deformation energy absorption level of the structure wall; the deformation damage modes of the liquid filled and unfilled regions of the structure are bulging tension and flexural bending, respectively; the strain energy per unit volume of the structure and the weakening effect on the initial impact load are enhanced with the increase of the impact velocity. The transverse filling method can be equated with tandem arrangement of variable stiffness springs, which only affects the local stiffness of the structure. And the longitudinal filling method can be equated with a parallel arrangement of multiple layers of variable stiffness springs, which affects the overall stiffness of the structure; the equivalent stiffness of the filled and unfilled regions changes dynamically, and the deformation mode of the structure is determined by the equivalent stiffness of each region in real time. When the load impact velocity is high, both transverse and longitudinal partially liquid filled inner concave multicell structures are superior to the unfilled inner concave multicell structure in weakening the initial impact load.
- partially liquid filled multicell structure,
- in-plane impact,
- deformation/failure modes,
- dynamic mechanical properties

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