Energy absorption characteristics and failure analysis of composite thin-walled structures with different cross-sectional configurations under medium- and low-speed compression loading

ZHANG Xinyue; HUI Xulong; GE Yujing; SHU Wan; BAI Chunyu; LIU Xiaochuan

doi:10.11883/bzycj-2021-0347

Volume 42 Issue 6

Jun. 2022

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ZHANG Xinyue, HUI Xulong, GE Yujing, SHU Wan, BAI Chunyu, LIU Xiaochuan. Energy absorption characteristics and failure analysis of composite thin-walled structures with different cross-sectional configurations under medium- and low-speed compression loading[J]. Explosion And Shock Waves, 2022, 42(6): 063102. doi: 10.11883/bzycj-2021-0347

Citation:

ZHANG Xinyue, HUI Xulong, GE Yujing, SHU Wan, BAI Chunyu, LIU Xiaochuan. Energy absorption characteristics and failure analysis of composite thin-walled structures with different cross-sectional configurations under medium- and low-speed compression loading[J]. Explosion And Shock Waves, 2022, 42(6): 063102. doi: 10.11883/bzycj-2021-0347

Citation:

ZHANG Xinyue, HUI Xulong, GE Yujing, SHU Wan, BAI Chunyu, LIU Xiaochuan. Energy absorption characteristics and failure analysis of composite thin-walled structures with different cross-sectional configurations under medium- and low-speed compression loading[J]. Explosion And Shock Waves, 2022, 42(6): 063102. doi: 10.11883/bzycj-2021-0347

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Energy absorption characteristics and failure analysis of composite thin-walled structures with different cross-sectional configurations under medium- and low-speed compression loading

doi: 10.11883/bzycj-2021-0347

Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics, Aircraft Strength Research Institute of China, Xi’an 710065, Shaanxi, China

Received Date: 2021-08-17
Accepted Date: 2022-03-17
Rev Recd Date: 2022-01-24

Available Online: 2022-04-06

Publish Date: 2022-06-24

Abstract

Abstract

In order to study the energy absorption characteristics of open-section thin-walled composite structures, axial compression tests were carried out by using a high-speed hydraulic servo test system. The loading speed was set to 0.01, 0.1 and 1 m/s. A high-speed camera was used to record the deformation and failure of the test specimens. The effects of cross-section shape, section aspect ratio, trigger mechanism, and loading speed on the energy absorption characteristics of the composite structures are analyzed. The failure and energy absorption mechanism of the structure in the crushing process is revealed. The results show that the energy absorption is mainly attributed to material bending, delamination, shear failure and friction between crushing zones during the crushing process. The cross-section shape has a significant influence on its energy absorption capacity. The average crushing loads of the hat shaped and Ω- shaped specimens are 14.1% and 14.6% higher than that of the C-channel specimens, and their specific energy absorption (SEA) are 14.3% and 14.8% higher than that of C-channel specimens, respectively. The stress concentration of C-channel specimens leads to insufficient material damage, responsible to their lower energy absorption capacity. On the other hand, the section aspect ratio has less effect on the energy absorption capacity of composite thin-walled structures. The trigger mechanism mainly affects the initial crushing stage of the structures. For the C-channel specimens, 45° chamfer trigger is more effective in reducing the initial peak load; while for the hat shaped test piece, the 15° steeple trigger is better. When the loading speed was increased from 0.01 m/s to 1 m/s, the average crushing load of the C channel, hat shaped and Ω-shaped specimens were reduced by 6.1%, 10.9% and 6.1%, respectively; while the SAE were reduced by 6.2%, 11.0% and 6.2% respectively. The increase of loading speed leads to more debris flying out, which reduces the loading area and material utilization of the structure, and it reduces the friction energy absorption of the collapse zone, too.
- composite thin-walled structure,
- energy absorption,
- cross-section shape,
- section aspect ratio,
- trigger mechanism,
- loading speed

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References(36)

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