Abstract
The paper deals with buckling, postbuckling, and failure of pre-damaged channel section beam subjected to pure bending. The channel section beams made of eight-layered GFRP laminate with different symmetrical layups have been considered. The specimens with initially pre-damaged web or flange were investigated to access the influence of impact damage on work of thin-walled structure in the full range of load till failure. The bending tests of initially pre-damage beams have been performed on a universal tensile machine with especially designed grips. The digital image correlation system allowing to follow the beam deflection have been employed. The experimentally obtained results are presented in graphs presenting load-deflection or load vs. angle of rotation relations and in photos presenting impact damages areas before and after bending test. The results show that the impact pre-damages have no significant influence on the work of channel section beams.
Highlights
Modern composites are light and durable, their properties can be adjusted by fitting them to the shape and manner of loading the designed structure
This paper presents the results of experimental investigation of pre-damaged by lateral low-velocity impact channel section columns subjected to pure bending
In this paper, buckling, postbuckling and failure of pre-damaged channel section beam subjected to pure bending have been investigated
Summary
Modern composites are light and durable, their properties can be adjusted by fitting them to the shape and manner of loading the designed structure. The influence of impact damage on the composite structure resistance is developed based on standard tests CAI [14,15] It should be notated, that it is possible to find a significant number of papers devoted to low-velocity impacts (LVIs) as well as to CAI [16], where the typical size and shape specimen Concluding the above, it can be said that it is quite easy to find results of investigations dealing with buckling and postbuckling behavior as well as showing the influence of impact pre-damage on the resistance of laminates, but in world literature there are not enough papers dealing with influence on impact pre-damages on buckling, postbuckling and failure of thin-walled laminates beam or columns. Operating damages (impact damages) and their influence on postbuckling and failure are presented
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