Abstract
Thin-walled members are increasingly used in structural applications, especially in light structures like in constructions and aircraft structures because of their high strength-to-weight ratio. Perforations are often made on these structures for reducing weight and to facilitate the services and maintenance works like in aircraft wing ribs. This type of structures suffers from buckling phenomena due to its dimensions, and this suffering increases with the presence of holes in it. This study investigated experimentally and numerically the buckling behavior of aluminum alloy 6061-O thin-walled lipped channel beam with specific holes subjected to compression load. A nonlinear finite elements analysis was used to obtain the buckling loads of the beams. Experimental tests were done to validate the finite element results. Three factors namely; shape of holes, opening ratio D/Do and the spacing ratio S/Do were chosen to study their effects on the buckling strength of the channel beams. Finite elements results were obtained by using Taguchi method to identify the best combination of the three parameters for optimum critical buckling load, whereas determining the contribution of each parameter on buckling strength was implemented by using the analysis of variance technique (ANOVA) method. Results showed that the combination of parameters that gives the best buckling strength is the hexagonal hole shape, D/Do=1.7 and S/Do= 1.3 and the opening ratio (or size of holes) is the most effective on buckling behavior.
Highlights
Aluminum alloy members are increasingly used in structural applications, especially in bridges and space structures because of their high strength-to-weight ratio, attractive appearance and the perfect corrosion resistance
It was clear that the presence of perforations causing a decrease in the ultimate loads of the channels with a percentage reduction of 9.14% for the hexagonal hole shape, 13.85% for the circular hole shape and a maximum percentage reduction of 15.24% for the square hole shape
This research investigated the buckling behavior of perforated aluminum alloy 6061-O thin-walled lipped channel beam under compression loading and studied the effect of three factors namely shape of holes, opening ratio D/Do and the spacing ratio of S/Do on ultimate strength and the strength-to-weight ratio of the perforated beam
Summary
Aluminum alloy members are increasingly used in structural applications, especially in bridges and space structures because of their high strength-to-weight ratio, attractive appearance and the perfect corrosion resistance. (Mazzolani et al, 2000) studied the behavior of 6060, 6061 and 6082 aluminum alloy members experimentally with square (SHS) and rectangular (RHS) hollow sections under uniform axial compression load. (Zhou and Young, 2010) investigated the buckling behavior of 6061-T6 aluminum alloy square hollow sections (SHS) with a circular hole under web crippling They presented 84 test results and 132 numerical results. (Feng, Young and Asce, 2015) studied the failure of SHS stub columns with circular holes under compression load and made a comparison between the test results and design strength using the current design rules for steel structural member with perforations. (Feng et al, 2018) tested a total of 64 specimens of 6061-T6 and 6063-T5 aluminum alloy perforated SHS and RHS under axial compression loading and results were compared with Design strength method. Cost and time required to carry out the experiments can be reduced by using Taguchi (Khamlichi et al, 2010), (Khamlichi and Limam, 2012), (Azadi and Rostamiyan, 2015), (Lin and Lee, 2015), (Soufain et al, 2017) and (H.M.AL-khafaji, 2017)
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