End crushing tests of composite laminates

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (19) : 216-222.

HUANG Chenghang1, SHEN Yuping1, LI Xiangqian2, WANG Yonggang1, PAN Diankun1, WU Zhangming1

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Abstract

In this research, a series of end crush experiments was carried out on T800 composite laminates. The effects of different lengths, thicknesses, stacking sequences, trigger angles and cementation pressures on the compressive properties of composite materials were studied. The failure mechanism was revealed by analyzing the load-displacement curve of the composite laminates in the process of end crush and observing the end failure morphology of the test sample. The results show that the end crushing process of composite laminates is unstable brittle fracture mode, while the end crushing process of composite laminates with 45° trigger angle is beam bending failure mode; In the end crushing test, the compressive strength of composite laminates increases with the increase of thickness, while the increase of length decreases the compressive strength. At the same time, [45/90/-45/0]3s laminates has better axial bearing capacity than [45/0/-45/0]3s laminates; The addition of trigger angle will change the failure mode and greatly reduce the compressive strength of the specimen during crushing, which is the key factor affecting the energy absorption capacity of composite structure; Finally, it is found that the mechanical properties of composite laminates under different cementation pressures increase gradually with cementation pressures, but the mechanical properties decrease when the cementation pressures increase to a certain value.
Keywords: Composite laminates; Macroscopic failure mode; End crushing; Trigger angle; Cementation pressure

Key words

Composite laminates / Macroscopic failure mode / End crushing / Trigger angle / Cementation pressure

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HUANG Chenghang1, SHEN Yuping1, LI Xiangqian2, WANG Yonggang1, PAN Diankun1, WU Zhangming1. End crushing tests of composite laminates[J]. Journal of Vibration and Shock, 2022, 41(19): 216-222

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