Study on pull-out failure behavior of composite honeycomb sandwich fasteners

doi:10.19936/j.cnki.2096-8000.20211028.003

Abstract

Abstract: The failure study of honeycomb sandwich structure still mainly depends on pull-out test currently. In this paper, the fracture form and carrying capacity of the composite honeycomb sandwich fastener connection under pull-out load are studied by experiment first, and the corresponding failure mechanism is revealed. But there is a need to quickly get the structure bearing capacity and failure form during designing and optimizing, in order to establish the finite element model. The stiffness theory of composite material panel and equivalent model of honeycomb sandwich is introduced. In this paper, the fracture mode and ultimate load of the structure are predicted numerically, and the results are compared with the test, which proves the validity of the numerical calculation method. Test and numerical calculation results indicate that the failure area of the composite honeycomb sandwich structure is mainly concentrated in the connection area. In order to improve the bearing capacity of the structure, the honeycomb in the connection area of the composite honeycomb sandwich structure is tried to be hollowed out and then sealed. Numerical calculations of the hollowed out honeycomb sealing structure are carried out. The performance of the local sealing composite honeycomb sandwich is better than that of the hollowed out honeycomb sealing structure, and the bearing capacity is significantly improved.

Key words: composite material, honeycomb sandwich, pull-out, sealing, finite element method

CLC Number:

TB332

WANG Ru, WANG Man, BAI Rui-xiang. Study on pull-out failure behavior of composite honeycomb sandwich fasteners[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(10): 19-25.

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