Buckling Behavior of Aluminum Alloy Thin-Walled Beam with Holes under Compression Loading

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.

Numerical Investigations of Perforated CFRP Z-Cross-Section Profiles, under Axial Compression

“…Moreover, in previous articles [ 37 , 38 , 39 , 40 ], the authors researched composite plate elements weakened by cut-out and composite profiles with different kinds of cross-section [ 41 , 42 , 43 ], but without cut-outs. Therefore, this has ignited author motivation, together with the papers by [ 35 , 36 ], for the analysis presented in this study, and hence contributes towards the knowledge on thin-walled composite structures with cut-outs.…”

“…Parameters such as the geometry of the web plate, the position of the hole and the plate slenderness are found by authors as those most influencing the post-critical behaviour. Moreover, in study [ 35 ], where aluminium alloys were used as a subject of the experiment, the authors tested the geometry and position of holes. In this paper, three types of shape, circular, hexagonal and rectangular, were chosen.…”

Numerical Buckling Analysis of Thin-Walled Channel-Section Composite Profiles Weakened by Cut-Outs

“…In this work, according to paper [32], three shapes of holes made on the profi le web were designed (Fig. 2).…”

“…This study sourced on the paper conducted by Khazaal et al [32], where the authors tested aluminium alloys profiles under compression. They chose three types of holes shapes to optimize the results: circular, rectangular and hexagon.…”

Holes' Parameters Analysis of a Perforated Thin-Walled Lipped Beam Buckled Under a Bending Load

“…Amongst different methods, the Taguchi and analyses of variance (ANOVA) techniques are efficient for optimisation, finding the best and most influential parameters. Several scholars discussed these two methods in buckling studies [17] to [22]. In this work, numerical and experimental investigations were presented to examine the buckling behaviour of perforated thin-walled lipped channel cantilever beams subjected to bending load, and the material of beams is aluminium alloy 6061-0.…”